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

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

diff --git a/app/models/relation.rb b/app/models/relation.rb
index 36d6943d97106e9ecfd42242fc8575c1932839e2..d2602f497270c455d3d3a4b44062670eaac689bd 100644 (file)
--- a/app/models/relation.rb
+++ b/app/models/relation.rb
@@ -87,7 +87,7 @@ class Relation < 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 'relation'
     el1['id'] = self.id.to_s
     el1['visible'] = self.visible.to_s
@@ -95,19 +95,25 @@ class Relation < 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 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.relation_members.each do |member|
@@ -227,7 +233,7 @@ class Relation < ActiveRecord::Base
 
   def delete_with_history!(new_relation, user)
     unless self.visible
-      raise OSM::APIAlreadyDeletedError.new
+      raise OSM::APIAlreadyDeletedError.new("relation", new_relation.id)
     end
 
     # need to start the transaction here, so that the database can 
@@ -236,9 +242,9 @@ class Relation < ActiveRecord::Base
     Relation.transaction do
       check_consistency(self, new_relation, user)
       # This will check to see if this relation is used by another relation
-      if RelationMember.find(:first, :joins => "INNER JOIN current_relations ON current_relations.id=current_relation_members.id", :conditions => [ "visible = ? AND member_type='Relation' and member_id=? ", true, self.id ])
-        raise OSM::APIPreconditionFailedError.new("The relation #{new_relation.id} is a used in another relation")
-      end
+      rel = RelationMember.find(:first, :joins => "INNER JOIN current_relations ON current_relations.id=current_relation_members.id", :conditions => [ "visible = ? AND member_type='Relation' and member_id=? ", true, self.id ])
+      raise OSM::APIPreconditionFailedError.new("The relation #{new_relation.id} is a used in relation #{rel.id}.") unless rel.nil?
+
       self.changeset_id = new_relation.changeset_id
       self.tags = {}
       self.members = []
@@ -249,8 +255,8 @@ class Relation < ActiveRecord::Base
 
   def update_from(new_relation, user)
     check_consistency(self, new_relation, user)
-    if !new_relation.preconditions_ok?
-      raise OSM::APIPreconditionFailedError.new
+    unless new_relation.preconditions_ok?
+      raise OSM::APIPreconditionFailedError.new("Cannot update relation #{self.id}: data or member data is invalid.")
     end
     self.changeset_id = new_relation.changeset_id
     self.changeset = new_relation.changeset
@@ -262,8 +268,8 @@ class Relation < 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 relation: data or member data is invalid.")
     end
     self.version = 0
     self.visible = true
@@ -338,7 +344,7 @@ class Relation < ActiveRecord::Base
       self.timestamp = t
       self.save!
 
-      tags = self.tags
+      tags = self.tags.clone
       self.relation_tags.each do |old_tag|
         key = old_tag.k
         # if we can match the tags we currently have to the list
@@ -346,11 +352,7 @@ class Relation < ActiveRecord::Base
         # if any are different then set the flag and do the DB 
         # update.
         if tags.has_key? key 
-          # rails 2.1 dirty handling should take care of making this
-          # somewhat efficient... hopefully...
-          old_tag.v = tags[key]
-          tags_changed |= old_tag.changed?
-          old_tag.save!
+          tags_changed |= (old_tag.v != tags[key])
 
           # remove from the map, so that we can expect an empty map
           # at the end if there are no new tags
@@ -359,13 +361,13 @@ class Relation < ActiveRecord::Base
         else
           # this means a tag was deleted
           tags_changed = true
-          RelationTag.delete_all ['id = ? and k = ?', self.id, old_tag.k]
         end
       end
       # if there are left-over tags then they are new and will have to
       # be added.
       tags_changed |= (not tags.empty?)
-      tags.each do |k,v|
+      RelationTag.delete_all(:id => self.id)
+      self.tags.each do |k,v|
         tag = RelationTag.new
         tag.k = k
         tag.v = v
@@ -373,10 +375,6 @@ class Relation < ActiveRecord::Base
         tag.save!
       end
       
-      # reload, so that all of the members are accessible in their
-      # new state.
-      self.reload
-
       # same pattern as before, but this time we're collecting the
       # changed members in an array, as the bounding box updates for
       # elements are per-element, not blanked on/off like for tags.