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

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

diff --git a/app/models/way.rb b/app/models/way.rb
index eb4bf48f428d84c981945447700ab38be15a6529..52d28020969f4e1d1ed51a70e21144ad2cf54eac 100644 (file)
--- a/app/models/way.rb
+++ b/app/models/way.rb
@@ -89,7 +89,7 @@ class Way < ActiveRecord::Base
     return doc
   end
 
-  def to_xml_node(visible_nodes = nil, user_display_name_cache = nil)
+  def to_xml_node(visible_nodes = nil, changeset_cache = {}, user_display_name_cache = {})
     el1 = XML::Node.new 'way'
     el1['id'] = self.id.to_s
     el1['visible'] = self.visible.to_s
@@ -97,19 +97,25 @@ class Way < ActiveRecord::Base
     el1['version'] = self.version.to_s
     el1['changeset'] = self.changeset_id.to_s
 
-    user_display_name_cache = {} if user_display_name_cache.nil?
+    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 and user_display_name_cache.key?(self.changeset.user_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
 
     # make sure nodes are output in sequence_id order
@@ -199,8 +205,8 @@ class Way < ActiveRecord::Base
 
   def update_from(new_way, user)
     check_consistency(self, new_way, user)
-    if !new_way.preconditions_ok?
-      raise OSM::APIPreconditionFailedError.new
+    unless new_way.preconditions_ok?
+      raise OSM::APIPreconditionFailedError.new("Cannot update way #{self.id}: data is invalid.")
     end
 
     self.changeset_id = new_way.changeset_id
@@ -213,8 +219,8 @@ class Way < ActiveRecord::Base
 
   def create_with_history(user)
     check_create_consistency(self, user)
-    if !self.preconditions_ok?
-      raise OSM::APIPreconditionFailedError.new
+    unless self.preconditions_ok?
+      raise OSM::APIPreconditionFailedError.new("Cannot create way: data is invalid.")
     end
     self.version = 0
     self.visible = true
@@ -237,7 +243,7 @@ class Way < ActiveRecord::Base
 
   def delete_with_history!(new_way, user)
     unless self.visible
-      raise OSM::APIAlreadyDeletedError
+      raise OSM::APIAlreadyDeletedError.new("way", new_way.id)
     end
     
     # need to start the transaction here, so that the database can