Handle deleted items better.

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

diff --git a/app/models/way.rb b/app/models/way.rb
index 2773ecc7b87ed83faec5e871d95d34f95b14fb42..f1dc76eb4c6b65053214e1e80f6665f70ad10052 100644 (file)
--- a/app/models/way.rb
+++ b/app/models/way.rb
@@ -1,57 +1,152 @@
 class Way < ActiveRecord::Base
   require 'xml/libxml'
 class Way < ActiveRecord::Base
   require 'xml/libxml'

-  
+

   belongs_to :user
   belongs_to :user

+
+  has_many :nodes, :through => :way_nodes, :order => 'sequence_id'
+  has_many :way_nodes, :foreign_key => 'id', :order => 'sequence_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
+
+      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'])
+          end
+        end

 
 

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

 
 

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

       end
       end

+    rescue
+      way = nil
+    end
+
+    return way
+  end
+
+  # 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
+
+  # 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
+
+  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
+
+    user_display_name_cache = {} if user_display_name_cache.nil?

 
 

-      if create
-        way.timestamp = Time.now
-        way.visible = true
+    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
       else

-        if pt['timestamp']
-          way.timestamp = Time.parse(pt['timestamp'])
+        # 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

+    end

 
 

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

+    end

 
 

-      pt.find('seg').each do |seg|
-        way.add_seg_num(seg['id'])
-      end
- 
+    self.way_tags.each do |tag|
+      e = XML::Node.new 'tag'
+      e['k'] = tag.k
+      e['v'] = tag.v
+      el1 << e
+    end
+    return el1
+  end 

 
 

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

     end
     end

+    @nds
+  end

 
 

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

   end
 
   end
 

-  def segs
-    @segs = Array.new unless @segs
-    @segs
+  def nds=(s)
+    @nds = s

   end
 
   end
 

-  def tags
-    @tags = Hash.new unless @tags
-    @tags
+  def tags=(t)
+    @tags = t

   end
 
   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)


@@ -59,23 +154,103 @@ 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
+
+    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)
     end
 
     old_way = OldWay.from_way(self)

-    old_way.save
+    old_way.timestamp = t
+    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
+         # FIXME
+         # this should actually delete the relations,
+         # not just throw a PreconditionFailed if it's a member of a relation!!
+      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
+      # end FIXME
+      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
+  def delete_with_relations_and_nodes_and_history(user)
+    
+    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 != #{self.id}")
+    
+    node_ids_not_to_delete = way_nodes.collect {|way_node| way_node.node_id}
+
+    node_ids_to_delete = node_ids - node_ids_not_to_delete
+
+    # delete the nodes not used by other ways
+    node_ids_to_delete.each do |node_id|
+      n = Node.find(node_id)
+      n.user_id = user.id
+      n.visible = false
+      n.save_with_history!
+    end
+    
+    self.user_id = user.id
+
+    self.delete_with_relations_and_history(user)
+
+  end

 end
 end