Add a changeset cache to stop us looking up the same changeset over

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

diff --git a/app/models/node.rb b/app/models/node.rb
index 1392fc65099f4123ccb06447f6f3d8f624cbad33..bd51d6c5013712835e8e811fee50520f230aecdf 100644 (file)
--- a/app/models/node.rb
+++ b/app/models/node.rb
@@ -123,7 +123,7 @@ class Node < ActiveRecord::Base
   # Should probably be renamed delete_from to come in line with update
   def delete_with_history!(new_node, user)
     unless self.visible
-      raise OSM::APIAlreadyDeletedError.new
+      raise OSM::APIAlreadyDeletedError.new("node", new_node.id)
     end
 
     # need to start the transaction here, so that the database can 
@@ -131,19 +131,21 @@ class Node < ActiveRecord::Base
     # shouldn't be possible to get race conditions.
     Node.transaction do
       check_consistency(self, new_node, user)
-      if WayNode.find(:first, :joins => "INNER JOIN current_ways ON current_ways.id = current_way_nodes.id", :conditions => [ "current_ways.visible = ? AND current_way_nodes.node_id = ?", true, self.id ])
-        raise OSM::APIPreconditionFailedError.new
-      elsif RelationMember.find(:first, :joins => "INNER JOIN current_relations ON current_relations.id=current_relation_members.id", :conditions => [ "visible = ? AND member_type='Node' and member_id=? ", true, self.id])
-        raise OSM::APIPreconditionFailedError.new
-      else
-        self.changeset_id = new_node.changeset_id
-        self.visible = false
-        
-        # update the changeset with the deleted position
-        changeset.update_bbox!(bbox)
-        
-        save_with_history!
-      end
+      way = WayNode.find(:first, :joins => "INNER JOIN current_ways ON current_ways.id = current_way_nodes.id", 
+                         :conditions => [ "current_ways.visible = ? AND current_way_nodes.node_id = ?", true, self.id ])
+      raise OSM::APIPreconditionFailedError.new("Node #{self.id} is still used by way #{way.id}.") unless way.nil?
+      
+      rel = RelationMember.find(:first, :joins => "INNER JOIN current_relations ON current_relations.id=current_relation_members.id", 
+                                :conditions => [ "visible = ? AND member_type='Node' and member_id=? ", true, self.id])
+      raise OSM::APIPreconditionFailedError.new("Node #{self.id} is still used by relation #{rel.id}.") unless rel.nil?
+
+      self.changeset_id = new_node.changeset_id
+      self.visible = false
+      
+      # update the changeset with the deleted position
+      changeset.update_bbox!(bbox)
+      
+      save_with_history!
     end
   end
 
@@ -186,27 +188,33 @@ class Node < ActiveRecord::Base
     return doc
   end
 
-  def to_xml_node(user_display_name_cache = nil)
+  def to_xml_node(changeset_cache = {}, user_display_name_cache = {})
     el1 = XML::Node.new 'node'
     el1['id'] = self.id.to_s
     el1['lat'] = self.lat.to_s
     el1['lon'] = self.lon.to_s
     el1['version'] = self.version.to_s
     el1['changeset'] = self.changeset_id.to_s
-    
-    user_display_name_cache = {} if user_display_name_cache.nil?
 
-    if user_display_name_cache and user_display_name_cache.key?(self.changeset.user_id)
+    if changeset_cache.key?(self.changeset_id)
+      # use the cache if available
+    else
+      changeset_cache[self.changeset_id] = self.changeset.user_id
+    end
+
+    user_id = changeset_cache[self.changeset_id]
+
+    if user_display_name_cache.key?(user_id)
       # use the cache if available
     elsif self.changeset.user.data_public?
-      user_display_name_cache[self.changeset.user_id] = self.changeset.user.display_name
+      user_display_name_cache[user_id] = self.changeset.user.display_name
     else
-      user_display_name_cache[self.changeset.user_id] = nil
+      user_display_name_cache[user_id] = nil
     end
 
-    if not user_display_name_cache[self.changeset.user_id].nil?
-      el1['user'] = user_display_name_cache[self.changeset.user_id]
-      el1['uid'] = self.changeset.user_id.to_s
+    if not user_display_name_cache[user_id].nil?
+      el1['user'] = user_display_name_cache[user_id]
+      el1['uid'] = user_id.to_s
     end
 
     self.tags.each do |k,v|