Most of a method to delete a way and all its nodes - but I'm waiting on splitting...

[rails.git] / app / models / way.rb

diff --git a/app/models/way.rb b/app/models/way.rb
index 0c53e5e87c08ce090b7a05561a001ea54c9705c6..121dff8bd4cece70358ecf3f2a7974658b5d5aa7 100644 (file)
--- a/app/models/way.rb
+++ b/app/models/way.rb
@@ -1,72 +1,111 @@
 class Way < ActiveRecord::Base
   require 'xml/libxml'
 class Way < ActiveRecord::Base
   require 'xml/libxml'

-  
+

   belongs_to :user
 
   belongs_to :user
 

-  has_many :way_segments, :foreign_key => 'id'
+  has_many :way_nodes, :foreign_key => 'id', :order => 'sequence_id'

   has_many :way_tags, :foreign_key => 'id'
 
   has_many :way_tags, :foreign_key => 'id'
 

+  has_many :old_ways, :foreign_key => 'id', :order => 'version'
+

   set_table_name 'current_ways'
 
   def self.from_xml(xml, create=false)
   set_table_name 'current_ways'
 
   def self.from_xml(xml, create=false)

-    p = XML::Parser.new
-    p.string = xml
-    doc = p.parse
+    begin
+      p = XML::Parser.new
+      p.string = xml
+      doc = p.parse

 
 

-    way = Way.new
+      way = Way.new

 
 

-    doc.find('//osm/way').each do |pt|
-      unless create and pt['id'] == '0'
-        way.id = pt['id'].to_i
-      end
+      doc.find('//osm/way').each do |pt|
+        if !create and pt['id'] != '0'
+          way.id = pt['id'].to_i
+        end

 
 

-      if create
-        way.timestamp = Time.now
-        way.visible = true
-      else
-        if pt['timestamp']
-          way.timestamp = Time.parse(pt['timestamp'])
+        if create
+          way.timestamp = Time.now
+          way.visible = true
+        else
+          if pt['timestamp']
+            way.timestamp = Time.parse(pt['timestamp'])
+          end

         end
         end

-      end

 
 

-      pt.find('tag').each do |tag|
-        way.add_tag_keyval(tag['k'], tag['v'])
-      end
+        pt.find('tag').each do |tag|
+          way.add_tag_keyval(tag['k'], tag['v'])
+        end

 
 

-      pt.find('seg').each do |seg|
-        way.add_seg_num(seg['id'])
+        pt.find('nd').each do |nd|
+          way.add_nd_num(nd['ref'])
+        end

       end
       end

-
+    rescue
+      way = nil

     end
 
     return way
   end
 
     end
 
     return way
   end
 

-  def to_xml
-    doc = XML::Document.new
-    doc.encoding = 'UTF-8' 
-    root = XML::Node.new 'osm'
-    root['version'] = '0.4'
-    root['generator'] = 'OpenStreetMap server'
-
-    doc.root = root
+  # Find a way given it's ID, and in a single SQL call also grab its nodes
+  #
+  
+  # You can't pull in all the tags too unless we put a sequence_id on the way_tags table and have a multipart key
+  def self.find_eager(id)
+    way = Way.find(id, :include => {:way_nodes => :node})
+    #If waytag had a multipart key that was real, you could do this:
+    #way = Way.find(id, :include => [:way_tags, {:way_nodes => :node}])
+  end

 
 

-    root << to_xml_node()
+  # Find a way given it's ID, and in a single SQL call also grab its nodes and tags
+  def to_xml
+    doc = OSM::API.new.get_xml_doc
+    doc.root << to_xml_node()

     return doc
   end
 
     return doc
   end
 

-  def to_xml_node
+  def to_xml_node(visible_nodes = nil, user_display_name_cache = nil)

     el1 = XML::Node.new 'way'
     el1['id'] = self.id.to_s
     el1['visible'] = self.visible.to_s
     el1['timestamp'] = self.timestamp.xmlschema
     el1 = XML::Node.new 'way'
     el1['id'] = self.id.to_s
     el1['visible'] = self.visible.to_s
     el1['timestamp'] = self.timestamp.xmlschema

-    
-    self.way_segments.each do |seg| # FIXME need to make sure they come back in the right order
-      e = XML::Node.new 'seg'
-      e['id'] = seg.segment_id.to_s
-      el1 << e
+
+    user_display_name_cache = {} if user_display_name_cache.nil?
+
+    if user_display_name_cache and user_display_name_cache.key?(self.user_id)
+      # use the cache if available
+    elsif self.user.data_public?
+      user_display_name_cache[self.user_id] = self.user.display_name
+    else
+      user_display_name_cache[self.user_id] = nil
+    end
+
+    el1['user'] = user_display_name_cache[self.user_id] unless user_display_name_cache[self.user_id].nil?
+
+    # make sure nodes are output in sequence_id order
+    ordered_nodes = []
+    self.way_nodes.each do |nd|
+      if visible_nodes
+        # if there is a list of visible nodes then use that to weed out deleted nodes
+        if visible_nodes[nd.node_id]
+          ordered_nodes[nd.sequence_id] = nd.node_id.to_s
+        end
+      else
+        # otherwise, manually go to the db to check things
+        if nd.node.visible? and nd.node.visible?
+          ordered_nodes[nd.sequence_id] = nd.node_id.to_s
+        end
+      end

     end
     end

- 
+
+    ordered_nodes.each do |nd_id|
+      if nd_id and nd_id != '0'
+        e = XML::Node.new 'nd'
+        e['ref'] = nd_id
+        el1 << e
+      end
+    end
+

     self.way_tags.each do |tag|
       e = XML::Node.new 'tag'
       e['k'] = tag.k
     self.way_tags.each do |tag|
       e = XML::Node.new 'tag'
       e['k'] = tag.k


@@ -76,28 +115,37 @@ class Way < ActiveRecord::Base
     return el1
   end 
 
     return el1
   end 
 

-
-  def segs
-    @segs = Array.new unless @segs
-    @segs
+  def nds
+    unless @nds
+      @nds = Array.new
+      self.way_nodes.each do |nd|
+        @nds += [nd.node_id]
+      end
+    end
+    @nds

   end
 
   def tags
   end
 
   def tags

-    @tags = Hash.new unless @tags
+    unless @tags
+      @tags = {}
+      self.way_tags.each do |tag|
+        @tags[tag.k] = tag.v
+      end
+    end

     @tags
   end
 
     @tags
   end
 

-  def segs=(s)
-    @segs = s
+  def nds=(s)
+    @nds = s

   end
 
   def tags=(t)
     @tags = t
   end
 
   end
 
   def tags=(t)
     @tags = t
   end
 

-  def add_seg_num(n)
-    @segs = Array.new unless @segs
-    @segs << n.to_i
+  def add_nd_num(n)
+    @nds = Array.new unless @nds
+    @nds << n.to_i

   end
 
   def add_tag_keyval(k, v)
   end
 
   def add_tag_keyval(k, v)


@@ -105,36 +153,111 @@ class Way < ActiveRecord::Base
     @tags[k] = v
   end
 
     @tags[k] = v
   end
 

-  def save_with_history
+  def save_with_history!

     t = Time.now
     t = Time.now

-    self.timestamp = t
-    self.save
-    
-    WayTag.delete_all(['id = ?', self.id])
-
-    self.tags.each do |k,v|
-      tag = WayTag.new
-      tag.k = k
-      tag.v = v
-      tag.id = self.id
-      tag.save
+
+    Way.transaction do
+      self.timestamp = t
+      self.save!

     end
 
     end
 

-    WaySegment.delete_all(['id = ?', self.id])
-    
-    i = 0
-    self.segs.each do |n|
-      seg = WaySegment.new
-      seg.id = self.id
-      seg.segment_id = n
-      seg.sequence_id = i
-      seg.save
-      i += 1
+    WayTag.transaction do
+      tags = self.tags
+
+      WayTag.delete_all(['id = ?', self.id])
+
+      tags.each do |k,v|
+        tag = WayTag.new
+        tag.k = k
+        tag.v = v
+        tag.id = self.id
+        tag.save!
+      end
+    end
+
+    WayNode.transaction do
+      nds = self.nds
+
+      WayNode.delete_all(['id = ?', self.id])
+
+      sequence = 1
+      nds.each do |n|
+        nd = WayNode.new
+        nd.id = [self.id, sequence]
+        nd.node_id = n
+        nd.save!
+        sequence += 1
+      end

     end
 
     old_way = OldWay.from_way(self)
     old_way.timestamp = t
     end
 
     old_way = OldWay.from_way(self)
     old_way.timestamp = t

-    old_way.save_with_dependencies
+    old_way.save_with_dependencies!

   end
 
   end
 

+  def preconditions_ok?
+    return false if self.nds.empty?
+    self.nds.each do |n|
+      node = Node.find(:first, :conditions => ["id = ?", n])
+      unless node and node.visible
+        return false
+      end
+    end
+    return true
+  end
+
+  # Delete the way and it's relations, but don't really delete it - set its visibility to false and update the history etc to maintain wiki-like functionality.
+  def delete_with_relations_and_history(user)
+    if self.visible
+      # omg FIXME
+      if RelationMember.find(:first, :joins => "INNER JOIN current_relations ON current_relations.id=current_relation_members.id",
+                             :conditions => [ "visible = 1 AND member_type='way' and member_id=?", self.id])
+        raise OSM::APIPreconditionFailedError
+      else
+        self.user_id = user.id
+        self.tags = []
+        self.nds = []
+        self.visible = false
+        self.save_with_history!
+      end
+    else
+      raise OSM::APIAlreadyDeletedError
+    end
+  end
+
+  # delete a way and it's nodes that aren't part of other ways, with history
+  # WARNING, INCOMPLETE - Read the code
+  def delete_with_relations_and_nodes_and_history(user)
+    return false # until complete, just return false
+    
+    node_ids = self.nodes.collect {|node| node.id }
+    node_ids_not_to_delete = []
+    way_nodes = WayNode.find(:all, :conditions => "node_id in [#{node_ids.join(',')}] and id not #{self.id}")
+    
+    node_ids_not_to_delete = way_nodes.collect {|way_node| way_node.node_id}
+
+    nodes_to_delete = node_ids - node_ids_not_to_delete
+
+    # update the visibility etc on the current nodes
+    update_time = Time.now()
+    
+    Node.update(node_ids_to_delete, {:user_id = user.id, :timestamp => update_time, :visibility => false})
+
+    # create old nodes
+
+    old_nodes_to_create = []
+    OldNode.find(node_ids_to_delete).each do |old_node|
+      old_nodes_to_create << {:id => old_node.id, :timestamp => update_time, :latitude => old_node.latitude, :longitude => old_node.longitude, :visible => false}
+    end
+
+    OldNode.create(old_nodes_to_create)
+
+    # FIXME - the old nodes need to have their tile updated and I have no idea how that works
+    # they also need their tags copied over, and that depends on normalising the tags out to their own table that nicks working on
+
+    # finally, delete the way
+    
+    self.delete_with_relations_and_history
+
+  end

 end
 end