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Relation Tag testing. Also sort the belong_to/has_many for user/changeset/old_way.
[rails.git] / app / controllers / amf_controller.rb
diff --git a/app/controllers/amf_controller.rb b/app/controllers/amf_controller.rb
index ef55ced62ad99bd61ad9e2ba36c8707be0bc5780..6e1b364d4794dbfef7ebeca2166e354078f1c604 100644 (file)
--- a/app/controllers/amf_controller.rb
+++ b/app/controllers/amf_controller.rb
@@ -1,337 +1,453 @@
-# AMF Controller is a semi-standalone API for Flash clients, particularly Potlatch.
-# All interaction between Potlatch (as a .SWF application) and the 
+# amf_controller is a semi-standalone API for Flash clients, particularly 
+# Potlatch. All interaction between Potlatch (as a .SWF application) and the 
 # OSM database takes place using this controller. Messages are 
 # encoded in the Actionscript Message Format (AMF).
 #
 # OSM database takes place using this controller. Messages are 
 # encoded in the Actionscript Message Format (AMF).
 #
-# See Also Potlatch::Potlatch and Potlatch::AMF
+# Helper functions are in /lib/potlatch.
 #
 #
-# Public domain.
-# editions Systeme D / Richard Fairhurst 2004-2008
+# Author::     editions Systeme D / Richard Fairhurst 2004-2008
+# Licence::    public domain.
 #
 #
-# All in/out parameters are floats unless explicitly stated.
+# == General structure
+#
+# Apart from the amf_read and amf_write methods (which distribute the requests
+# from the AMF message), each method generally takes arguments in the order 
+# they were sent by the Potlatch SWF. Do not assume typing has been preserved. 
+# Methods all return an array to the SWF.
+#
+# == API 0.6
+#
+# Note that this requires a patched version of composite_primary_keys 1.1.0
+# (see http://groups.google.com/group/compositekeys/t/a00e7562b677e193) 
+# if you are to run with POTLATCH_USE_SQL=false .
+# 
+# == Debugging
+# 
+# Any method that returns a status code (0 for ok) can also send:
+#      return(-1,"message")            <-- just puts up a dialogue
+#      return(-2,"message")            <-- also asks the user to e-mail me
 # 
 # 
-# to trap errors (getway_old,putway,putpoi,deleteway only):
-#   return(-1,"message")               <-- just puts up a dialogue
-#   return(-2,"message")               <-- also asks the user to e-mail me
-# to log:
-#   RAILS_DEFAULT_LOGGER.error("Args: #{args[0]}, #{args[1]}, #{args[2]}, #{args[3]}")
+# To write to the Rails log, use RAILS_DEFAULT_LOGGER.info("message").
+
 class AmfController < ApplicationController
   require 'stringio'
 
   include Potlatch
 
 class AmfController < ApplicationController
   require 'stringio'
 
   include Potlatch
 
+  # Help methods for checking boundary sanity and area size
+  include MapBoundary
+
   session :off
   before_filter :check_write_availability
 
   session :off
   before_filter :check_write_availability
 
-  # Main AMF handler. Tha talk method takes in AMF, figures out what to do and dispatched to the appropriate private method
-  def talk
-    req=StringIO.new(request.raw_post+0.chr)   # Get POST data as request
-    # (cf http://www.ruby-forum.com/topic/122163)
-    req.read(2)                                                                        # Skip version indicator and client ID
-    results={}                                                                 # Results of each body
-    renumberednodes={}                                                 # Shared across repeated putways
-    renumberedways={}                                                  # Shared across repeated putways
-
-    # -------------
-    # Parse request
-
-    headers=AMF.getint(req)                                    # Read number of headers
-
-    headers.times do                               # Read each header
-      name=AMF.getstring(req)                          #  |
-      req.getc                                         #  | skip boolean
-      value=AMF.getvalue(req)                          #  |
-      header["name"]=value                             #  |
-    end
+  # Main AMF handlers: process the raw AMF string (using AMF library) and
+  # calls each action (private method) accordingly.
+  # ** FIXME: refactor to reduce duplication of code across read/write
+  
+  def amf_read
+       req=StringIO.new(request.raw_post+0.chr)# Get POST data as request
+                                                                                       # (cf http://www.ruby-forum.com/topic/122163)
+       req.read(2)                                                             # Skip version indicator and client ID
+       results={}                                                              # Results of each body
 
 
-    bodies=AMF.getint(req)                                     # Read number of bodies
-    bodies.times do                                    # Read each body
-      message=AMF.getstring(req)                       #  | get message name
-      index=AMF.getstring(req)                         #  | get index in response sequence
-      bytes=AMF.getlong(req)                           #  | get total size in bytes
-      args=AMF.getvalue(req)                           #  | get response (probably an array)
-
-      case message
-      when 'getpresets';               results[index]=AMF.putdata(index,getpresets)
-      when 'whichways';                        results[index]=AMF.putdata(index,whichways(args))
-      when 'whichways_deleted';        results[index]=AMF.putdata(index,whichways_deleted(args))
-      when 'getway';                   results[index]=AMF.putdata(index,getway(args))
-      when 'getrelation';              results[index]=AMF.putdata(index,getrelation(args))
-      when 'getway_old';               results[index]=AMF.putdata(index,getway_old(args))
-      when 'getway_history';   results[index]=AMF.putdata(index,getway_history(args))
-      when 'putway';                   r=putway(args,renumberednodes)
-                                                               renumberednodes=r[3]
-                                                               if r[1] != r[2]
-                                                                       renumberedways[r[1]] = r[2]
-                                                               end
-                                                               results[index]=AMF.putdata(index,r)
-      when 'putrelation';              results[index]=AMF.putdata(index,putrelation(args, renumberednodes, renumberedways))
-      when 'deleteway';                        results[index]=AMF.putdata(index,deleteway(args))
-      when 'putpoi';                   results[index]=AMF.putdata(index,putpoi(args))
-      when 'getpoi';                   results[index]=AMF.putdata(index,getpoi(args))
-      end
-    end
+       # Parse request
 
 
-    # ------------------
-    # Write out response
+       headers=AMF.getint(req)                                 # Read number of headers
 
 
-    RAILS_DEFAULT_LOGGER.info("  Response: start")
-    a,b=results.length.divmod(256)
-    render :content_type => "application/x-amf", :text => proc { |response, output| 
-      output.write 0.chr+0.chr+0.chr+0.chr+a.chr+b.chr
-      results.each do |k,v|
-        output.write(v)
-      end
-    }
-    RAILS_DEFAULT_LOGGER.info("  Response: end")
+       headers.times do                                                # Read each header
+         name=AMF.getstring(req)                               #  |
+         req.getc                                                              #  | skip boolean
+         value=AMF.getvalue(req)                               #  |
+         header["name"]=value                                  #  |
+       end
+
+       bodies=AMF.getint(req)                                  # Read number of bodies
+       bodies.times do                                                 # Read each body
+         message=AMF.getstring(req)                    #  | get message name
+         index=AMF.getstring(req)                              #  | get index in response sequence
+         bytes=AMF.getlong(req)                                #  | get total size in bytes
+         args=AMF.getvalue(req)                                #  | get response (probably an array)
+      logger.info "Executing AMF #{message}:#{index}"
+
+         case message
+               when 'getpresets';                      results[index]=AMF.putdata(index,getpresets())
+               when 'whichways';                       results[index]=AMF.putdata(index,whichways(*args))
+               when 'whichways_deleted';       results[index]=AMF.putdata(index,whichways_deleted(*args))
+               when 'getway';                          results[index]=AMF.putdata(index,getway(args[0].to_i))
+               when 'getrelation';                     results[index]=AMF.putdata(index,getrelation(args[0].to_i))
+               when 'getway_old';                      results[index]=AMF.putdata(index,getway_old(args[0].to_i,args[1].to_i))
+               when 'getway_history';          results[index]=AMF.putdata(index,getway_history(args[0].to_i))
+               when 'getnode_history';         results[index]=AMF.putdata(index,getnode_history(args[0].to_i))
+               when 'findgpx';                         results[index]=AMF.putdata(index,findgpx(*args))
+               when 'findrelations';           results[index]=AMF.putdata(index,findrelations(*args))
+               when 'getpoi';                          results[index]=AMF.putdata(index,getpoi(*args))
+         end
+       end
+    logger.info("encoding AMF results")
+    sendresponse(results)
+  end
+
+  def amf_write
+       req=StringIO.new(request.raw_post+0.chr)
+       req.read(2)
+       results={}
+       renumberednodes={}                                              # Shared across repeated putways
+       renumberedways={}                                               # Shared across repeated putways
+
+       headers=AMF.getint(req)                                 # Read number of headers
+       headers.times do                                                # Read each header
+         name=AMF.getstring(req)                               #  |
+         req.getc                                                              #  | skip boolean
+         value=AMF.getvalue(req)                               #  |
+         header["name"]=value                                  #  |
+       end
+
+       bodies=AMF.getint(req)                                  # Read number of bodies
+       bodies.times do                                                 # Read each body
+         message=AMF.getstring(req)                    #  | get message name
+         index=AMF.getstring(req)                              #  | get index in response sequence
+         bytes=AMF.getlong(req)                                #  | get total size in bytes
+         args=AMF.getvalue(req)                                #  | get response (probably an array)
+
+         case message
+               when 'putway';                          r=putway(renumberednodes,*args)
+                                                                       renumberednodes=r[3]
+                                                                       if r[1] != r[2]
+                                                                         renumberedways[r[1]] = r[2]
+                                                                       end
+                                                                       results[index]=AMF.putdata(index,r)
+               when 'putrelation';                     results[index]=AMF.putdata(index,putrelation(renumberednodes, renumberedways, *args))
+               when 'deleteway';                       results[index]=AMF.putdata(index,deleteway(*args))
+               when 'putpoi';                          results[index]=AMF.putdata(index,putpoi(*args))
+               when 'startchangeset';          results[index]=AMF.putdata(index,startchangeset(*args))
+         end
+       end
+    sendresponse(results)
   end
 
   private
 
   end
 
   private
 
-  # Return presets (default tags and crap) to potlatch.
-  # Uses POTLATCH_PRESETS global, set up in OSM::Potlatch
-  def getpresets #:doc:
-    return POTLATCH_PRESETS
+  # Start new changeset
+  
+  def startchangeset(usertoken, cstags, closeid, closecomment)
+       uid = getuserid(usertoken)
+       if !uid then return -1,"You are not logged in, so Potlatch can't write any changes to the database." end
+
+       # close previous changeset and add comment
+       if closeid
+         cs = Changeset.find(closeid)
+         cs.open = false
+         if closecomment.empty?
+               cs.save!
+         else
+           cs.tags['comment']=closecomment
+           cs.save_with_tags!
+         end
+       end
+       
+       # open a new changeset
+       cs = Changeset.new
+       cs.tags = cstags
+       cs.user_id = uid
+       cs.created_at = Time.now
+       cs.save_with_tags!
+       return [0,cs.id]
+  end
+
+  # Return presets (default tags, localisation etc.):
+  # uses POTLATCH_PRESETS global, set up in OSM::Potlatch.
+
+  def getpresets() #:doc:
+       return POTLATCH_PRESETS
   end
 
   end
 
-  # ----- whichways
-  # Find all the way ids and nodes (including tags and projected lat/lng) which aren't part of those ways in an are
-  # 
-  # The argument is an array containing the following, in order:
-  # 0. minimum longitude
-  # 1. minimum latitude
-  # 2. maximum longitude
-  # 3. maximum latitude
-  # 4. baselong, 5. basey, 6. masterscale as above
-  def whichways(args) #:doc:
-    xmin = args[0].to_f-0.01
-    ymin = args[1].to_f-0.01
-    xmax = args[2].to_f+0.01
-    ymax = args[3].to_f+0.01
-    baselong    = args[4]
-    basey       = args[5]
-    masterscale = args[6]
+  # Find all the ways, POI nodes (i.e. not part of ways), and relations
+  # in a given bounding box. Nodes are returned in full; ways and relations 
+  # are IDs only. 
 
   def whichways(xmin, ymin, xmax, ymax) #:doc:
        xmin -= 0.01; ymin -= 0.01
        xmax += 0.01; ymax += 0.01
 
   def whichways(xmin, ymin, xmax, ymax) #:doc:
        xmin -= 0.01; ymin -= 0.01
        xmax += 0.01; ymax += 0.01
+    
+    # check boundary is sane and area within defined
+    # see /config/application.yml
+    begin
+      check_boundaries(xmin, ymin, xmax, ymax)
+    rescue Exception => err
+      return [-2,"Sorry - I can't get the map for that area."]
+    end
 
        if POTLATCH_USE_SQL then
 
        if POTLATCH_USE_SQL then
-         way_ids = sql_find_way_ids_in_area(xmin, ymin, xmax, ymax)
+         ways = sql_find_ways_in_area(xmin, ymin, xmax, ymax)
          points = sql_find_pois_in_area(xmin, ymin, xmax, ymax)
          points = sql_find_pois_in_area(xmin, ymin, xmax, ymax)
-         relation_ids = sql_find_relations_in_area_and_ways(xmin, ymin, xmax, ymax, way_ids)
+         relations = sql_find_relations_in_area_and_ways(xmin, ymin, xmax, ymax, ways.collect {|x| x[0]})
        else
          # find the way ids in an area
        else
          # find the way ids in an area
-         nodes_in_area = Node.find_by_area(ymin, xmin, ymax, xmax, :conditions => "current_nodes.visible = 1", :include => :ways)
-         way_ids = nodes_in_area.collect { |node| node.way_ids }.flatten.uniq
+         nodes_in_area = Node.find_by_area(ymin, xmin, ymax, xmax, :conditions => ["current_nodes.visible = ?", true], :include => :ways)
+         ways = nodes_in_area.collect { |node| 
+               node.ways.collect { |w| [w.id,w.version] }.flatten
+         }.uniq
+         ways.delete([])
 
 
-    # find the node ids in an area that aren't part of ways
-    nodes_not_used_in_area = nodes_in_area.select { |node| node.ways.empty? }
-    points = nodes_not_used_in_area.collect { |n| [n.id, n.lon_potlatch(baselong,masterscale), n.lat_potlatch(basey,masterscale), n.tags_as_hash] }
+         # find the node ids in an area that aren't part of ways
+         nodes_not_used_in_area = nodes_in_area.select { |node| node.ways.empty? }
+         points = nodes_not_used_in_area.collect { |n| [n.id, n.lon, n.lat, n.tags] }
 
          # find the relations used by those nodes and ways
 
          # find the relations used by those nodes and ways
-         relations = Relation.find_for_nodes(nodes_in_area.collect { |n| n.id }, :conditions => "visible = 1") +
-                  Relation.find_for_ways(way_ids, :conditions => "visible = 1")
-         relation_ids = relations.collect { |relation| relation.id }.uniq
+         relations = Relation.find_for_nodes(nodes_in_area.collect { |n| n.id }, :conditions => {:visible => true}) +
+                  Relation.find_for_ways(ways.collect { |w| w[0] }, :conditions => {:visible => true})
+         relations = relations.collect { |relation| [relation.id,relation.version] }.uniq
        end
 
        end
 
-       [way_ids, points, relation_ids]
+       [0,ways, points, relations]
   end
 
   end
 
-  # ----- whichways_deleted
-  #              return array of deleted ways in current bounding box
-  #              in:   as whichways
-  #              does: finds all deleted ways with a deleted node in bounding box
-  #              out:  [0] array of way ids
-  def whichways_deleted(args) #:doc:
-    xmin = args[0].to_f-0.01
-    ymin = args[1].to_f-0.01
-    xmax = args[2].to_f+0.01
-    ymax = args[3].to_f+0.01
-    baselong    = args[4]
-    basey       = args[5]
-    masterscale = args[6]
+  # Find deleted ways in current bounding box (similar to whichways, but ways
+  # with a deleted node only - not POIs or relations).
 
   def whichways_deleted(xmin, ymin, xmax, ymax) #:doc:
        xmin -= 0.01; ymin -= 0.01
        xmax += 0.01; ymax += 0.01
 
 
   def whichways_deleted(xmin, ymin, xmax, ymax) #:doc:
        xmin -= 0.01; ymin -= 0.01
        xmax += 0.01; ymax += 0.01
 
-       nodes_in_area = Node.find_by_area(ymin, xmin, ymax, xmax, :conditions => "current_nodes.visible = 0 AND current_ways.visible = 0", :include => :ways_via_history)
+    # check boundary is sane and area within defined
+    # see /config/application.yml
+    begin
+      check_boundaries(xmin, ymin, xmax, ymax)
+    rescue Exception => err
+      return [-2,"Sorry - I can't get the map for that area."]
+    end
+
+       nodes_in_area = Node.find_by_area(ymin, xmin, ymax, xmax, :conditions => ["current_ways.visible = ?", false], :include => :ways_via_history)
        way_ids = nodes_in_area.collect { |node| node.ways_via_history_ids }.flatten.uniq
 
        way_ids = nodes_in_area.collect { |node| node.ways_via_history_ids }.flatten.uniq
 
-       [way_ids]
+       [0,way_ids]
   end
 
   end
 
-  # ----- getway
-  # Get a way with all of it's nodes and tags
-  # The input is an array with the following components, in order:
-  # 0. wayid - the ID of the way to get
-  # 1. baselong - origin of SWF map (longitude)
-  # 2. basey - origin of SWF map (latitude)
-  # 3. masterscale - SWF map scale
-  #
-  # The output is an array which contains all the nodes (with projected 
-  # latitude and longitude) and tags for a way (and all the nodes tags). 
-  # It also has the way's unprojected (WGS84) bbox.
-  #
-  # FIXME: The server really shouldn't be figuring out a ways bounding box and doing projection for potlatch
-  # FIXME: the argument splitting should be done in the 'talk' method, not here
-  def getway(args) #:doc:
-    wayid,baselong,basey,masterscale = args
-    wayid = wayid.to_i
+  # Get a way including nodes and tags.
+  # Returns the way id, a Potlatch-style array of points, a hash of tags, and the version number.
 
   def getway(wayid) #:doc:
        if POTLATCH_USE_SQL then
          points = sql_get_nodes_in_way(wayid)
          tags = sql_get_tags_in_way(wayid)
 
   def getway(wayid) #:doc:
        if POTLATCH_USE_SQL then
          points = sql_get_nodes_in_way(wayid)
          tags = sql_get_tags_in_way(wayid)
+         version = sql_get_way_version(wayid)
        else
          # Ideally we would do ":include => :nodes" here but if we do that
          # then rails only seems to return the first copy of a node when a
          # way includes a node more than once
        else
          # Ideally we would do ":include => :nodes" here but if we do that
          # then rails only seems to return the first copy of a node when a
          # way includes a node more than once
-         way = Way.find(wayid)
+      begin
+           way = Way.find(wayid)
+      rescue ActiveRecord::RecordNotFound
+        return [wayid,[],{}]
+      end
+
+      # check case where way has been deleted or doesn't exist
+      return [wayid,[],{}] if way.nil? or !way.visible
+
          points = way.nodes.collect do |node|
          points = way.nodes.collect do |node|
-               [node.lon, node.lat, node.id, nil, node.tags_as_hash]
+               nodetags=node.tags
+               nodetags.delete('created_by')
+               [node.lon, node.lat, node.id, nodetags]
          end
          tags = way.tags
          end
          tags = way.tags
+         version = way.version
        end
 
        end
 
-       [wayid, points, tags]
+       [wayid, points, tags, version]
   end
 
   end
 
-  # ----- getway_old
-  #              returns old version of way
-  #              in:   [0] way id,
-  #                            [1] way version to get (or -1 for "last deleted version")
-  #                            [2] baselong, [3] basey, [4] masterscale
-  #              does: gets old version of way and all constituent nodes
-  #                            for undelete, always uses the most recent version of each node
-  #                              (even if it's moved)
-  #                            for revert, uses the historic version of each node, but if that node is
-  #                              still visible and has been changed since, generates a new node id
-  #              out:  [0] 0 (code for success), [1] SWF object name,
-  #                            [2] array of points (as getway _except_ [3] is node.visible?, 0 or 1),
-  #                            [4] xmin, [5] xmax, [6] ymin, [7] ymax (unprojected bbox),
-  #                            [8] way version
-  def getway_old(args) #:doc:
-    RAILS_DEFAULT_LOGGER.info("  Message: getway_old (server is #{SERVER_URL})")
-    #  if SERVER_URL=="www.openstreetmap.org" then return -1,"Revert is not currently enabled on the OpenStreetMap server." end
+  # Get an old version of a way, and all constituent nodes.
+  #
+  # For undelete (version<0), always uses the most recent version of each node, 
+  # even if it's moved.  For revert (version >= 0), uses the node in existence 
+  # at the time, generating a new id if it's still visible and has been moved/
+  # retagged.
+  #
+  # Returns:
+  # 0. success code, 
+  # 1. id, 
+  # 2. array of points, 
+  # 3. hash of tags, 
+  # 4. version, 
+  # 5. is this the current, visible version? (boolean)
 
   def getway_old(id, version) #:doc:
        if version < 0
 
   def getway_old(id, version) #:doc:
        if version < 0
-         old_way = OldWay.find(:first, :conditions => ['visible = 1 AND id = ?', id], :order => 'version DESC')
-         points = old_way.get_nodes_undelete
+         old_way = OldWay.find(:first, :conditions => ['visible = ? AND id = ?', true, id], :order => 'version DESC')
+         points = old_way.get_nodes_undelete unless old_way.nil?
        else
          old_way = OldWay.find(:first, :conditions => ['id = ? AND version = ?', id, version])
        else
          old_way = OldWay.find(:first, :conditions => ['id = ? AND version = ?', id, version])
-         points = old_way.get_nodes_revert
+         points = old_way.get_nodes_revert unless old_way.nil?
        end
 
        end
 
-       old_way.tags['history'] = "Retrieved from v#{old_way.version}"
-
-       [0, id, points, old_way.tags, old_way.version]
+    if old_way.nil?
+      return [-1, id, [], {}, -1,0]
+    else
+         curway=Way.find(id)
+         old_way.tags['history'] = "Retrieved from v#{old_way.version}"
+         return [0, id, points, old_way.tags, old_way.version, (curway.version==old_way.version and curway.visible)]
+    end
   end
   end
+  
+  # Find history of a way. Returns 'way', id, and 
+  # an array of previous versions.
 
   def getway_history(wayid) #:doc:
 
   def getway_history(wayid) #:doc:
-       history = Way.find(wayid).old_ways.collect do |old_way|
-         user = old_way.user.data_public? ? old_way.user.display_name : 'anonymous'
-         [old_way.version, old_way.timestamp.strftime("%d %b %Y, %H:%M"), old_way.visible ? 1 : 0, user]
-       end
+    begin
+         history = Way.find(wayid).old_ways.reverse.collect do |old_way|
+        user_object = old_way.changeset.user
+           user = user_object.data_public? ? user_object.display_name : 'anonymous'
+           uid  = user_object.data_public? ? user_object.id : 0
+           [old_way.version, old_way.timestamp.strftime("%d %b %Y, %H:%M"), old_way.visible ? 1 : 0, user, uid]
+         end
 
 
-       [history]
+         return ['way',wayid,history]
+    rescue ActiveRecord::RecordNotFound
+      return ['way', wayid, []]
+    end
+  end
+
+  # Find history of a node. Returns 'node', id, and 
+  # an array of previous versions.
+
+  def getnode_history(nodeid) #:doc:
+    begin
+         history = Node.find(nodeid).old_nodes.reverse.collect do |old_node|
+        user_object = old_node.changeset.user
+           user = user_object.data_public? ? user_object.display_name : 'anonymous'
+           uid  = user_object.data_public? ? user_object.id : 0
+           [old_node.version, old_node.timestamp.strftime("%d %b %Y, %H:%M"), old_node.visible ? 1 : 0, user, uid]
+         end
+
+         return ['node',nodeid,history]
+    rescue ActiveRecord::RecordNotFound
+      return ['node', nodeid, []]
+    end
+  end
+
+  # Find GPS traces with specified name/id.
+  # Returns array listing GPXs, each one comprising id, name and description.
+  
+  def findgpx(searchterm, usertoken)
+       uid = getuserid(usertoken)
+       if !uid then return -1,"You must be logged in to search for GPX traces." end
+
+       gpxs = []
+       if searchterm.to_i>0 then
+         gpx = Trace.find(searchterm.to_i, :conditions => ["visible=? AND (public=? OR user_id=?)",true,true,uid] )
+         if gpx then
+           gpxs.push([gpx.id, gpx.name, gpx.description])
+         end
+       else
+         Trace.find(:all, :limit => 21, :conditions => ["visible=? AND (public=? OR user_id=?) AND MATCH(name) AGAINST (?)",true,true,uid,searchterm] ).each do |gpx|
+               gpxs.push([gpx.id, gpx.name, gpx.description])
+         end
+       end
+       gpxs
   end
 
   # Get a relation with all tags and members.
   # Returns:
   # 0. relation id,
   # 1. hash of tags,
   end
 
   # Get a relation with all tags and members.
   # Returns:
   # 0. relation id,
   # 1. hash of tags,
-  # 2. list of members.
+  # 2. list of members,
+  # 3. version.
   
   def getrelation(relid) #:doc:
   
   def getrelation(relid) #:doc:
-       rel = Relation.find(relid)
+    begin
+         rel = Relation.find(relid)
+    rescue ActiveRecord::RecordNotFound
+      return [relid, {}, []]
+    end
 
 
-       [relid, rel.tags, rel.members]
+    return [relid, {}, [], nil] if rel.nil? or !rel.visible
+       [relid, rel.tags, rel.members, rel.version]
+  end
+
+  # Find relations with specified name/id.
+  # Returns array of relations, each in same form as getrelation.
+  
+  def findrelations(searchterm)
+       rels = []
+       if searchterm.to_i>0 then
+         rel = Relation.find(searchterm.to_i)
+         if rel and rel.visible then
+           rels.push([rel.id, rel.tags, rel.members])
+         end
+       else
+         RelationTag.find(:all, :limit => 11, :conditions => ["match(v) against (?)", searchterm] ).each do |t|
+               if t.relation.visible then
+             rels.push([t.relation.id, t.relation.tags, t.relation.members])
+           end
+         end
+       end
+       rels
   end
 
   end
 
-  # ----- getrelation
-  #              save relation to the database
-  #              in:   [0] user token (string),
-  #                            [1] original relation id (may be negative),
-  #                            [2] hash of tags, [3] list of members,
-  #                            [4] visible
-  #              out:  [0] 0 (success), [1] original relation id (unchanged),
-  #                            [2] new relation id
-  def putrelation(args, renumberednodes, renumberedways) #:doc:
-    usertoken,relid,tags,members,visible=args
-    uid=getuserid(usertoken)
-    if !uid then return -1,"You are not logged in, so the point could not be saved." end
-
-  def putrelation(renumberednodes, renumberedways, usertoken, relid, tags, members, visible) #:doc:
+  # Save a relation.
+  # Returns
+  # 0. 0 (success),
+  # 1. original relation id (unchanged),
+  # 2. new relation id.
+
+  def putrelation(renumberednodes, renumberedways, usertoken, changeset, relid, tags, members, visible) #:doc:
        uid = getuserid(usertoken)
        if !uid then return -1,"You are not logged in, so the relation could not be saved." end
 
        relid = relid.to_i
        uid = getuserid(usertoken)
        if !uid then return -1,"You are not logged in, so the relation could not be saved." end
 
        relid = relid.to_i
-       visible = visible.to_i
+       visible = (visible.to_i != 0)
 
        # create a new relation, or find the existing one
 
        # create a new relation, or find the existing one
-    if relid <= 0
-      rel = Relation.new
-    else
-      rel = Relation.find(relid)
-    end
+       if relid <= 0
+         rel = Relation.new
+         rel.version = 0
+       else
+         rel = Relation.find(relid)
+       end
 
 
-    # check the members are all positive, and correctly type
-    typedmembers = []
-    members.each do |m|
-      mid = m[1].to_i
-      if mid < 0
-        mid = renumberednodes[mid] if m[0] == 'node'
-        mid = renumberedways[mid] if m[0] == 'way'
-        if mid < 0
-          return -2, "Negative ID unresolved"
-        end
-      end
-      typedmembers << [m[0], mid, m[2]]
-    end
+       # check the members are all positive, and correctly type
+       typedmembers = []
+       members.each do |m|
+         mid = m[1].to_i
+         if mid < 0
+               mid = renumberednodes[mid] if m[0] == 'node'
+               mid = renumberedways[mid] if m[0] == 'way'
+         end
+      if mid
+           typedmembers << [m[0], mid, m[2]]
+         end
+       end
 
        # assign new contents
        rel.members = typedmembers
        rel.tags = tags
        rel.visible = visible
 
        # assign new contents
        rel.members = typedmembers
        rel.tags = tags
        rel.visible = visible
-       rel.user_id = uid
+       rel.changeset_id = changeset
 
 
-    # check it then save it
-    # BUG: the following is commented out because it always fails on my
-    #  install. I think it's a Rails bug.
+       # check it then save it
+       # BUG: the following is commented out because it always fails on my
+       #  install. I think it's a Rails bug.
 
 
-    #if !rel.preconditions_ok?
-    #  return -2, "Relation preconditions failed"
-    #else
-      rel.save_with_history!
-    #end
+       #if !rel.preconditions_ok?
+       #  return -2, "Relation preconditions failed"
+       #else
+         rel.save_with_history!
+       #end
 
        [0, relid, rel.id]
   end
 
 
        [0, relid, rel.id]
   end
 
-  # ----- putway
-  #              saves a way to the database
-  #              in:   [0] user token (string),
-  #                            [1] original way id (may be negative), 
-  #                            [2] array of points (as getway/getway_old),
-  #                            [3] hash of way tags,
-  #                            [4] original way version (0 if not a reverted/undeleted way),
-  #                            [5] baselong, [6] basey, [7] masterscale
-  #              does: saves way to the database
-  #                            all constituent nodes are created/updated as necessary
-  #                            (or deleted if they were in the old version and are otherwise unused)
-  #              out:  [0] 0 (code for success), [1] original way id (unchanged),
-  #                            [2] new way id, [3] hash of renumbered nodes (old id=>new id),
-  #                            [4] xmin, [5] xmax, [6] ymin, [7] ymax (unprojected bbox)
-  def putway(args,renumberednodes) #:doc:
-    RAILS_DEFAULT_LOGGER.info("  putway started")
-    usertoken,originalway,points,attributes,oldversion,baselong,basey,masterscale=args
-    uid=getuserid(usertoken)
-    if !uid then return -1,"You are not logged in, so the way could not be saved." end
-
-  def putway(renumberednodes, usertoken, originalway, points, attributes) #:doc:
+  # Save a way to the database, including all nodes. Any nodes in the previous
+  # version and no longer used are deleted.
+  # 
+  # Returns:
+  # 0. '0' (code for success),
+  # 1. original way id (unchanged),
+  # 2. new way id,
+  # 3. hash of renumbered nodes (old id=>new id),
+  # 4. version
+
+  def putway(renumberednodes, usertoken, changeset, originalway, points, attributes) #:doc:
 
        # -- Initialise and carry out checks
        
 
        # -- Initialise and carry out checks
        
@@ -347,17 +463,18 @@ class AmfController < ApplicationController
 
        if points.length < 2 then return -2,"Server error - way is only #{points.length} points long." end
 
 
        if points.length < 2 then return -2,"Server error - way is only #{points.length} points long." end
 
-    # -- 3.    read original way into memory
+       # -- Get unique nodes
 
        if originalway < 0
          way = Way.new
 
        if originalway < 0
          way = Way.new
+         way.version = 0       # otherwise +=1 breaks
          uniques = []
        else
          way = Way.find(originalway)
          uniques = way.unshared_node_ids
        end
 
          uniques = []
        else
          way = Way.find(originalway)
          uniques = way.unshared_node_ids
        end
 
-    # -- 4.    get version by inserting new row into ways
+       # -- Compare nodes and save changes to any that have changed
 
        nodes = []
 
 
        nodes = []
 
@@ -372,20 +489,23 @@ class AmfController < ApplicationController
          elsif id < 0
                # Create new node
                node = Node.new
          elsif id < 0
                # Create new node
                node = Node.new
+               node.version = 0        # otherwise +=1 breaks
                savenode = true
          else
                node = Node.find(id)
                savenode = true
          else
                node = Node.find(id)
+               nodetags=node.tags
+               nodetags.delete('created_by')
                if !fpcomp(lat, node.lat) or !fpcomp(lon, node.lon) or
                if !fpcomp(lat, node.lat) or !fpcomp(lon, node.lon) or
-                  Tags.join(n[4]) != node.tags or !node.visible?
+                  n[4] != nodetags or !node.visible?
                  savenode = true
                end
          end
 
          if savenode
                  savenode = true
                end
          end
 
          if savenode
-               node.user_id = uid
+               node.changeset_id = changeset
            node.lat = lat
         node.lon = lon
            node.lat = lat
         node.lon = lon
-           node.tags = Tags.join(n[4])
+           node.tags = n[4]
            node.visible = true
            node.save_with_history!
 
            node.visible = true
            node.save_with_history!
 
@@ -405,49 +525,33 @@ class AmfController < ApplicationController
          deleteitemrelations(n, 'node')
 
          node = Node.find(n)
          deleteitemrelations(n, 'node')
 
          node = Node.find(n)
-         node.user_id = uid
+         node.changeset_id = changeset
          node.visible = false
          node.save_with_history!
        end
 
          node.visible = false
          node.save_with_history!
        end
 
-    points.each_index do |i|
-      xs=coord2long(points[i][0],masterscale,baselong)
-      ys=coord2lat(points[i][1],masterscale,basey)
-      xmin=[xs,xmin].min; xmax=[xs,xmax].max
-      ymin=[ys,ymin].min; ymax=[ys,ymax].max
-      node=points[i][2].to_i
-      tagstr=array2tag(points[i][4])
-      tagsql="'"+sqlescape(tagstr)+"'"
-      lat=(ys * 10000000).round
-      long=(xs * 10000000).round
-      tile=QuadTile.tile_for_point(ys, xs)
-
-       way.tags = attributes
-       way.nds = nodes
-       way.user_id = uid
-       way.visible = true
-       way.save_with_history!
-
-       [0, originalway, way.id, renumberednodes]
+       # -- Save revised way
+
+       if way.tags!=attributes or way.nds!=nodes or !way.visible?
+         way.tags = attributes
+         way.nds = nodes
+         way.changeset_id = changeset
+         way.visible = true
+         way.save_with_history!
+       end
+
+       [0, originalway, way.id, renumberednodes, way.version]
   end
 
   end
 
-  # ----- putpoi
-  #              save POI to the database
-  #              in:   [0] user token (string),
-  #                            [1] original node id (may be negative),
-  #                            [2] projected longitude, [3] projected latitude,
-  #                            [4] hash of tags, [5] visible (0 to delete, 1 otherwise), 
-  #                            [6] baselong, [7] basey, [8] masterscale
-  #              does: saves POI node to the database
-  #                            refuses save if the node has since become part of a way
-  #              out:  [0] 0 (success), [1] original node id (unchanged),
-  #                            [2] new node id
-  def putpoi(args) #:doc:
-    usertoken,id,x,y,tags,visible,baselong,basey,masterscale=args
-    uid=getuserid(usertoken)
-    if !uid then return -1,"You are not logged in, so the point could not be saved." end
-
-  def putpoi(usertoken, id, lon, lat, tags, visible) #:doc:
+  # Save POI to the database.
+  # Refuses save if the node has since become part of a way.
+  # Returns:
+  # 0. 0 (success),
+  # 1. original node id (unchanged),
+  # 2. new node id,
+  # 3. version.
+
+  def putpoi(usertoken, changeset, id, lon, lat, tags, visible) #:doc:
        uid = getuserid(usertoken)
        if !uid then return -1,"You are not logged in, so the point could not be saved." end
 
        uid = getuserid(usertoken)
        if !uid then return -1,"You are not logged in, so the point could not be saved." end
 
@@ -463,97 +567,64 @@ class AmfController < ApplicationController
          end
        else
          node = Node.new
          end
        else
          node = Node.new
+         node.version = 0
        end
 
        end
 
-       node.user_id = uid
+       node.changeset_id = changeset
        node.lat = lat
        node.lon = lon
        node.lat = lat
        node.lon = lon
-       node.tags = Tags.join(tags)
+       node.tags = tags
        node.visible = visible
        node.save_with_history!
 
        node.visible = visible
        node.save_with_history!
 
-       [0, id, node.id]
+       [0, id, node.id, node.version]
   end
 
   end
 
-  # ----- getpoi
-  # read POI from database
-  #              (only called on revert: POIs are usually read by whichways)
-  #              in:   [0] node id, [1] baselong, [2] basey, [3] masterscale
-  #              does: reads POI
-  #              out:  [0] id (unchanged), [1] projected long, [2] projected lat,
-  #                            [3] hash of tags
-  def getpoi(args) #:doc:
-    id,baselong,basey,masterscale = args
-    
-    n = Node.find(id.to_i)
-    if n
-      return [n.id, n.lon_potlatch(baselong,masterscale), n.lat_potlatch(basey,masterscale), n.tags_as_hash]
-    else
-      return [nil,nil,nil,'']
-    end
-  end
+  # Read POI from database
+  # (only called on revert: POIs are usually read by whichways).
+  #
+  # Returns array of id, long, lat, hash of tags, version.
 
 
-  def getpoi(id) #:doc:
-       n = Node.find(id)
+  def getpoi(id,version) #:doc:
+       if version>0 then
+         n = OldNode.find(id, :conditions=>['version=?',version])
+       else
+         n = Node.find(id)
+       end
 
        if n
 
        if n
-         return [n.id, n.lon, n.lat, n.tags_as_hash]
+         return [n.id, n.lon, n.lat, n.tags, n.version]
        else
        else
-         return [nil, nil, nil, '']
+         return [nil, nil, nil, {}, nil]
        end
   end
 
        end
   end
 
+  # Delete way and all constituent nodes. Also removes from any relations.
+  # Returns 0 (success), unchanged way id.
 
 
-  def deleteway(usertoken, way_id) #:doc:
-       uid = getuserid(usertoken)
-       if !uid then return -1,"You are not logged in, so the way could not be deleted." end
+  def deleteway(usertoken, changeset_id, way_id) #:doc:
+       if !getuserid(usertoken) then return -1,"You are not logged in, so the way could not be deleted." end
+
+       way_id = way_id.to_i
 
        # FIXME: would be good not to make two history entries when removing
        #                two nodes from the same relation
 
        # FIXME: would be good not to make two history entries when removing
        #                two nodes from the same relation
-       user = User.find(uid)
        way = Way.find(way_id)
        way.unshared_node_ids.each do |n|
          deleteitemrelations(n, 'node')
        end
        way = Way.find(way_id)
        way.unshared_node_ids.each do |n|
          deleteitemrelations(n, 'node')
        end
+       deleteitemrelations(way_id, 'way')
 
 
-       way.delete_with_relations_and_nodes_and_history(user)  
+       way.delete_with_relations_and_nodes_and_history(changeset_id.to_i)
 
        [0, way_id]
   end
 
 
        [0, way_id]
   end
 
-  def createuniquenodes(way,uqn_name,nodelist) #:doc:
-    # Find nodes which appear in this way but no others
-    sql=<<-EOF
-  CREATE TEMPORARY TABLE #{uqn_name}
-          SELECT a.node_id
-            FROM (SELECT DISTINCT node_id FROM current_way_nodes
-              WHERE id=#{way}) a
-         LEFT JOIN current_way_nodes b
-            ON b.node_id=a.node_id
-             AND b.id!=#{way}
-           WHERE b.node_id IS NULL
-  EOF
-    unless nodelist.empty? then
-      sql+="AND a.node_id NOT IN ("+nodelist.join(',')+")"
-    end
-    ActiveRecord::Base.connection.execute(sql)
-  end
-
-
 
   # ====================================================================
 
   # ====================================================================
-  # Relations handling
-  # deleteuniquenoderelations(uqn_name,uid,db_now)
-  # deleteitemrelations(way|node,'way'|'node',uid,db_now)
-
-  def deleteuniquenoderelations(uqn_name,uid,db_now) #:doc:
-    sql=<<-EOF
-  SELECT node_id,cr.id FROM #{uqn_name},current_relation_members crm,current_relations cr 
-   WHERE crm.member_id=node_id 
-     AND crm.member_type='node' 
-     AND crm.id=cr.id 
-     AND cr.visible=1
-  EOF
+  # Support functions
+
+  # Remove a node or way from all relations
 
   def deleteitemrelations(objid, type) #:doc:
        relations = RelationMember.find(:all, 
 
   def deleteitemrelations(objid, type) #:doc:
        relations = RelationMember.find(:all, 
@@ -566,102 +637,143 @@ class AmfController < ApplicationController
        end
   end
 
        end
   end
 
-  def deleteitemrelations(objid,type,uid,db_now) #:doc:
-    sql=<<-EOF
-  SELECT cr.id FROM current_relation_members crm,current_relations cr 
-   WHERE crm.member_id=#{objid} 
-     AND crm.member_type='#{type}' 
-     AND crm.id=cr.id 
-     AND cr.visible=1
-  EOF
-
-    relways=ActiveRecord::Base.connection.select_all(sql)
-    relways.each do |a|
-      removefromrelation(objid,type,a['id'],uid,db_now)
-    end
-  end
-
-  def removefromrelation(objid,type,relation,uid,db_now) #:doc:
-    rver=ActiveRecord::Base.connection.insert("INSERT INTO relations (id,user_id,timestamp,visible) VALUES (#{relation},#{uid},#{db_now},1)")
-
-    tagsql=<<-EOF
-  INSERT INTO relation_tags (id,k,v,version) 
-  SELECT id,k,v,#{rver} FROM current_relation_tags 
-   WHERE id=#{relation} 
-  EOF
-    ActiveRecord::Base.connection.insert(tagsql)
-
-    membersql=<<-EOF
-  INSERT INTO relation_members (id,member_type,member_id,member_role,version) 
-  SELECT id,member_type,member_id,member_role,#{rver} FROM current_relation_members 
-   WHERE id=#{relation} 
-     AND (member_id!=#{objid} OR member_type!='#{type}')
-  EOF
-    ActiveRecord::Base.connection.insert(membersql)
-
-    ActiveRecord::Base.connection.update("UPDATE current_relations SET user_id=#{uid},timestamp=#{db_now} WHERE id=#{relation}")
-    ActiveRecord::Base.connection.execute("DELETE FROM current_relation_members WHERE id=#{relation} AND member_type='#{type}' AND member_id=#{objid}")
-  end
+  # Break out node tags into a hash
+  # (should become obsolete as of API 0.6)
 
 
-  def sqlescape(a) #:doc:
-    a.gsub(/[\000-\037]/,"").gsub("'","''").gsub(92.chr) {92.chr+92.chr}
-  end
-
-  def tag2array(a) #:doc:
-    tags={}
-    Tags.split(a) do |k, v|
-      tags[k.gsub(':','|')]=v
-    end
-    tags
+  def tagstring_to_hash(a) #:doc:
+       tags={}
+       Tags.split(a) do |k, v|
+         tags[k]=v
+       end
+       tags
   end
 
   end
 
-  def array2tag(a) #:doc:
-    tags = []
-    a.each do |k,v|
-      if v=='' then next end
-      if v[0,6]=='(type ' then next end
-      tags << [k.gsub('|',':'), v]
-    end
-    return Tags.join(tags)
-  end
+  # Authenticate token
+  # (can also be of form user:pass)
 
   def getuserid(token) #:doc:
 
   def getuserid(token) #:doc:
-    if (token =~ /^(.+)\+(.+)$/) then
-      user = User.authenticate(:username => $1, :password => $2)
-    else
-      user = User.authenticate(:token => token)
-    end
+       if (token =~ /^(.+)\:(.+)$/) then
+         user = User.authenticate(:username => $1, :password => $2)
+       else
+         user = User.authenticate(:token => token)
+       end
 
 
-    return user ? user.id : nil;
+       return user ? user.id : nil;
   end
 
   end
 
-  # ====================================================================
-  # Co-ordinate conversion
+  # Compare two floating-point numbers to within 0.0000001
 
 
-  def lat2coord(a,basey,masterscale) #:doc:
-    -(lat2y(a)-basey)*masterscale
+  def fpcomp(a,b) #:doc:
+       return ((a/0.0000001).round==(b/0.0000001).round)
   end
 
   end
 
-  def long2coord(a,baselong,masterscale) #:doc:
-    (a-baselong)*masterscale
+  # Send AMF response
+  
+  def sendresponse(results)
+       a,b=results.length.divmod(256)
+       render :content_type => "application/x-amf", :text => proc { |response, output| 
+         # ** move amf writing loop into here - 
+         # basically we read the messages in first (into an array of some sort),
+         # then iterate through that array within here, and do all the AMF writing
+         output.write 0.chr+0.chr+0.chr+0.chr+a.chr+b.chr
+         results.each do |k,v|
+               output.write(v)
+         end
+       }
   end
 
   end
 
-  def lat2y(a) #:doc:
-    180/Math::PI * Math.log(Math.tan(Math::PI/4+a*(Math::PI/180)/2))
-  end
 
 
-  def coord2lat(a,masterscale,basey) #:doc:
-    y2lat(a/-masterscale+basey)
+  # ====================================================================
+  # Alternative SQL queries for getway/whichways
+
+  def sql_find_ways_in_area(xmin,ymin,xmax,ymax)
+       sql=<<-EOF
+  SELECT DISTINCT current_ways.id AS wayid,current_ways.version AS version
+               FROM current_way_nodes
+  INNER JOIN current_nodes ON current_nodes.id=current_way_nodes.node_id
+  INNER JOIN current_ways  ON current_ways.id =current_way_nodes.id
+          WHERE current_nodes.visible=TRUE 
+                AND current_ways.visible=TRUE 
+                AND #{OSM.sql_for_area(ymin, xmin, ymax, xmax, "current_nodes.")}
+       EOF
+       return ActiveRecord::Base.connection.select_all(sql).collect { |a| [a['wayid'].to_i,a['version'].to_i] }
   end
   end
-
-  def coord2long(a,masterscale,baselong) #:doc:
-    a/masterscale+baselong
+       
+  def sql_find_pois_in_area(xmin,ymin,xmax,ymax)
+       pois=[]
+       sql=<<-EOF
+                 SELECT current_nodes.id,current_nodes.latitude*0.0000001 AS lat,current_nodes.longitude*0.0000001 AS lon,current_nodes.version 
+                       FROM current_nodes 
+ LEFT OUTER JOIN current_way_nodes cwn ON cwn.node_id=current_nodes.id 
+                  WHERE current_nodes.visible=TRUE
+                        AND cwn.id IS NULL
+                        AND #{OSM.sql_for_area(ymin, xmin, ymax, xmax, "current_nodes.")}
+       EOF
+       ActiveRecord::Base.connection.select_all(sql).each do |row|
+         poitags={}
+         ActiveRecord::Base.connection.select_all("SELECT k,v FROM current_node_tags WHERE id=#{row['id']}").each do |n|
+               poitags[n['k']]=n['v']
+         end
+         pois << [row['id'].to_i, row['lon'].to_f, row['lat'].to_f, poitags, row['version'].to_i]
+       end
+       pois
   end
   end
-
-  def y2lat(a)
-    180/Math::PI * (2*Math.atan(Math.exp(a*Math::PI/180))-Math::PI/2)
+       
+  def sql_find_relations_in_area_and_ways(xmin,ymin,xmax,ymax,way_ids)
+       # ** It would be more Potlatchy to get relations for nodes within ways
+       #    during 'getway', not here
+       sql=<<-EOF
+         SELECT DISTINCT cr.id AS relid,cr.version AS version 
+               FROM current_relations cr
+  INNER JOIN current_relation_members crm ON crm.id=cr.id 
+  INNER JOIN current_nodes cn ON crm.member_id=cn.id AND crm.member_type='node' 
+          WHERE #{OSM.sql_for_area(ymin, xmin, ymax, xmax, "cn.")}
+       EOF
+       unless way_ids.empty?
+         sql+=<<-EOF
+          UNION
+         SELECT DISTINCT cr.id AS relid,cr.version AS version
+               FROM current_relations cr
+  INNER JOIN current_relation_members crm ON crm.id=cr.id
+          WHERE crm.member_type='way' 
+                AND crm.member_id IN (#{way_ids.join(',')})
+         EOF
+       end
+       return ActiveRecord::Base.connection.select_all(sql).collect { |a| [a['relid'].to_i,a['version'].to_i] }
+  end
+       
+  def sql_get_nodes_in_way(wayid)
+       points=[]
+       sql=<<-EOF
+               SELECT latitude*0.0000001 AS lat,longitude*0.0000001 AS lon,current_nodes.id 
+                 FROM current_way_nodes,current_nodes 
+                WHERE current_way_nodes.id=#{wayid.to_i} 
+                  AND current_way_nodes.node_id=current_nodes.id 
+                  AND current_nodes.visible=TRUE
+         ORDER BY sequence_id
+         EOF
+       ActiveRecord::Base.connection.select_all(sql).each do |row|
+         nodetags={}
+         ActiveRecord::Base.connection.select_all("SELECT k,v FROM current_node_tags WHERE id=#{row['id']}").each do |n|
+               nodetags[n['k']]=n['v']
+         end
+         nodetags.delete('created_by')
+         points << [row['lon'].to_f,row['lat'].to_f,row['id'].to_i,nodetags]
+       end
+       points
+  end
+       
+  def sql_get_tags_in_way(wayid)
+       tags={}
+       ActiveRecord::Base.connection.select_all("SELECT k,v FROM current_way_tags WHERE id=#{wayid.to_i}").each do |row|
+         tags[row['k']]=row['v']
+       end
+       tags
   end
 
   end
 
+  def sql_get_way_version(wayid)
+    ActiveRecord::Base.connection.select_one("SELECT version FROM current_ways WHERE id=#{wayid.to_i}")
+  end
 end
 
 # Local Variables:
 end
 
 # Local Variables:
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