include Redactable
belongs_to :changeset
- belongs_to :redaction
+ belongs_to :redaction, :optional => true
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]