relation.Type = Many2Many

	var (
		err             error
		joinTableFields []reflect.StructField
		fieldsMap       = map[string]*Field{}
		ownFieldsMap    = map[string]*Field{} // fix self join many2many
		referFieldsMap  = map[string]*Field{}
		joinForeignKeys = toColumns(field.TagSettings["JOINFOREIGNKEY"])
		joinReferences  = toColumns(field.TagSettings["JOINREFERENCES"])
	)

	// Therefore, we need to record the UniqueIndex on this column (exclude Mul UniqueIndex) for MigrateColumnUnique.
	UniqueIndex string
}

func (field *Field) BindName() string {
	return strings.Join(field.BindNames, ".")
}

// ParseField parses reflect.StructField to Field
func (schema *Schema) ParseField(fieldStruct reflect.StructField) *Field {
	var (
		err        error