Use changeset and user caches in Changeset#download

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

diff --git a/app/models/old_relation.rb b/app/models/old_relation.rb
index 6f364225b9b079a87429bf6daba16cb70b07c177..b2e86c930b4caaf5262af950c930b63ddbce82f8 100644 (file)
--- a/app/models/old_relation.rb
+++ b/app/models/old_relation.rb
@@ -1,9 +1,19 @@
 class OldRelation < ActiveRecord::Base
   include ConsistencyValidations
   
-  set_table_name 'relations'
+  self.table_name = "relations"
+  self.primary_keys = "relation_id", "version"
+
+  # note this needs to be included after the table name changes, or
+  # the queries generated by Redactable will use the wrong table name.
+  include Redactable
 
   belongs_to :changeset
+  belongs_to :redaction
+  belongs_to :current_relation, :class_name => "Relation", :foreign_key => "relation_id"
+
+  has_many :old_members, :class_name => 'OldRelationMember', :foreign_key => [:relation_id, :version], :order => :sequence_id
+  has_many :old_tags, :class_name => 'OldRelationTag', :foreign_key => [:relation_id, :version]
   
   validates_associated :changeset
 
@@ -12,7 +22,7 @@ class OldRelation < ActiveRecord::Base
     old_relation.visible = relation.visible
     old_relation.changeset_id = relation.changeset_id
     old_relation.timestamp = relation.timestamp
-    old_relation.id = relation.id
+    old_relation.relation_id = relation.id
     old_relation.version = relation.version
     old_relation.members = relation.members
     old_relation.tags = relation.tags
@@ -25,7 +35,7 @@ class OldRelation < ActiveRecord::Base
     save!
     clear_aggregation_cache
     clear_association_cache
-    @attributes.update(OldRelation.find(:first, :conditions => ['id = ? AND timestamp = ?', self.id, self.timestamp]).instance_variable_get('@attributes'))
+    @attributes.update(OldRelation.where(:relation_id => self.relation_id, :timestamp => self.timestamp).order("version DESC").first.instance_variable_get('@attributes'))
 
     # ok, you can touch from here on
 
@@ -33,14 +43,14 @@ class OldRelation < ActiveRecord::Base
       tag = OldRelationTag.new
       tag.k = k
       tag.v = v
-      tag.id = self.id
+      tag.relation_id = self.relation_id
       tag.version = self.version
       tag.save!
     end
 
     self.members.each_with_index do |m,i|
       member = OldRelationMember.new
-      member.id = [self.id, self.version, i]
+      member.id = [self.relation_id, self.version, i]
       member.member_type = m[0].classify
       member.member_id = m[1]
       member.member_role = m[2]
@@ -50,20 +60,20 @@ class OldRelation < ActiveRecord::Base
 
   def members
     unless @members
-        @members = Array.new
-        OldRelationMember.find(:all, :conditions => ["id = ? AND version = ?", self.id, self.version], :order => "sequence_id").each do |m|
-            @members += [[m.type,m.id,m.role]]
-        end
+      @members = Array.new
+      OldRelationMember.where(:relation_id => self.relation_id, :version => self.version).order(:sequence_id).each do |m|
+        @members += [[m.type,m.id,m.role]]
+      end
     end
     @members
   end
 
   def tags
     unless @tags
-        @tags = Hash.new
-        OldRelationTag.find(:all, :conditions => ["id = ? AND version = ?", self.id, self.version]).each do |tag|
-            @tags[tag.k] = tag.v
-        end
+      @tags = Hash.new
+      OldRelationTag.where(:relation_id => self.relation_id, :version => self.version).each do |tag|
+        @tags[tag.k] = tag.v
+      end
     end
     @tags = Hash.new unless @tags
     @tags
@@ -77,34 +87,42 @@ class OldRelation < ActiveRecord::Base
     @tags = t
   end
 
-#  has_many :relation_segments, :class_name => 'OldRelationSegment', :foreign_key => 'id'
-#  has_many :relation_tags, :class_name => 'OldRelationTag', :foreign_key => 'id'
-
-  def old_members
-    OldRelationMember.find(:all, :conditions => ['id = ? AND version = ?', self.id, self.version], :order => "sequence_id")
-  end
-
-  def old_tags
-    OldRelationTag.find(:all, :conditions => ['id = ? AND version = ?', self.id, self.version])    
-  end
-
   def to_xml
     doc = OSM::API.new.get_xml_doc
     doc.root << to_xml_node()
     return doc
   end
 
-  def to_xml_node
+  def to_xml_node(changeset_cache = {}, user_display_name_cache = {})
     el1 = XML::Node.new 'relation'
-    el1['id'] = self.id.to_s
+    el1['id'] = self.relation_id.to_s
     el1['visible'] = self.visible.to_s
     el1['timestamp'] = self.timestamp.xmlschema
-    if self.changeset.user.data_public?
-      el1['user'] = self.changeset.user.display_name
-      el1['uid'] = self.changeset.user.id.to_s
-    end
     el1['version'] = self.version.to_s
     el1['changeset'] = self.changeset_id.to_s
+
+    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[user_id] = self.changeset.user.display_name
+    else
+      user_display_name_cache[user_id] = nil
+    end
+
+    if not user_display_name_cache[user_id].nil?
+      el1['user'] = user_display_name_cache[user_id]
+      el1['uid'] = user_id.to_s
+    end
+    
+    el1['redacted'] = self.redaction.id.to_s if self.redacted?
     
     self.old_members.each do |member|
       e = XML::Node.new 'member'
@@ -113,13 +131,14 @@ class OldRelation < ActiveRecord::Base
       e['role'] = member.member_role.to_s
       el1 << e
     end
- 
+    
     self.old_tags.each do |tag|
       e = XML::Node.new 'tag'
       e['k'] = tag.k
       e['v'] = tag.v
       el1 << e
     end
+
     return el1
   end
 
@@ -137,4 +156,10 @@ class OldRelation < ActiveRecord::Base
   def containing_relation_members
     return []
   end
+
+  # check whether this element is the latest version - that is,
+  # has the same version as its "current" counterpart.
+  def is_latest_version?
+    current_relation.version == self.version
+  end
 end