Refuses an update that makes a record its own parent: the attribute :field may not hold the
record's own id. Any other record, or none, is let through. The refusal is :message on :field.
validate {MishkaBlog.Resources.Validations.NotItsOwnParent,
field: :parent_tag_id,
message: dgettext_noop("errors", "Tag cannot be its own parent.")}It reads the id of the record being updated, so it belongs on an update action.
Options
:field- Required. The attribute holding the parent's id.:message- Required. The refusal.