fieldtype

type Definition struct {
	Name       string                            //eg. text
	DataType   string                            //eg. string or eg "fieldtype.CustomString"
	Package    string                            //empty if there is no additional package, otherwise it's like 'mycompany.fieldtype'. Used for generating entity's import.
	NewHandler func(definition.FieldDef) Handler //callback to create new handler for this fieldtype
}

type EmptyError struct {
}

type Event interface {
	BeforeStore(ctx context.Context, value interface{}, existing interface{}, mode string) (interface{}, error)

	AfterDelete(ctx context.Context, value interface{}) error
}

type Handler interface {
	//Load from input, should return the value of BaseType, (eg. int), return error or validation error or empty error
	LoadInput(ctx context.Context, input interface{}, mode string) (interface{}, error)

	//output database field. todo: can support this to generate database field automatically
	DBField() string
}

type Outputer interface {
	Output(ctx context.Context, querier querier.Querier, value interface{}) interface{}
}

type RelationParameters struct {
	Type      string                 `json:"type"`
	Value     string                 `json:"value"`
	Condition map[string]interface{} `json:"condition"`
}

type StoreHandler interface {
	Store(ctx context.Context, value interface{}, contentType string, cid int, transaction *sql.Tx) error
}

type ValidationError struct {
	Message string
}