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
+ validates :changeset, :presence => true, :associated => true
+ validates :timestamp, :presence => true
+ validates :visible, :inclusion => [true, false]
def self.from_relation(relation)
old_relation = OldRelation.new