return
}

func (rel *Relationship) ParseConstraint() *Constraint {
	str := rel.Field.TagSettings["CONSTRAINT"]
	if str == "-" {
		return nil
	}

	if rel.Type == BelongsTo {
		for _, r := range rel.FieldSchema.Relationships.Relations {
			if r != rel && r.FieldSchema == rel.Schema && len(rel.References) == len(r.References) {
				matched := true