+ belongs_to :redaction
+ belongs_to :current_relation, :class_name => "Relation", :foreign_key => "relation_id"
+
+ has_many :old_members, -> { order(:sequence_id) }, :class_name => 'OldRelationMember', :foreign_key => [:relation_id, :version]
+ has_many :old_tags, :class_name => 'OldRelationTag', :foreign_key => [:relation_id, :version]
+
+ validates_associated :changeset