ownFieldsMap    = map[string]*Field{} // fix self join many2many
		referFieldsMap  = map[string]*Field{}
		joinForeignKeys = toColumns(field.TagSettings["JOINFOREIGNKEY"])
		joinReferences  = toColumns(field.TagSettings["JOINREFERENCES"])
	)

	ownForeignFields := schema.PrimaryFields
	refForeignFields := relation.FieldSchema.PrimaryFields

	if len(relation.foreignKeys) > 0 {
		ownForeignFields = []*Field{}