ent 的Mixin 可以让我们服用已有的schema
Mixin 接口说明
type Mixin interface {
Fields() []ent.Field
}
一个demo
- 代码
// -------------------------------------------------
// Mixin definition
// TimeMixin implements the ent.Mixin for sharing
// time fields with package schemas.
type TimeMixin struct{}
func (TimeMixin) Fields() []ent.Field {
return []ent.Field{
field.Time("created_at").
Immutable().
Default(time.Now),
field.Time("updated_at").
Default(time.Now).
UpdateDefault(time.Now),
}
}
// DetailsMixin implements the ent.Mixin for sharing
// entity details fields with package schemas.
type DetailsMixin struct{}
func (DetailsMixin) Fields() []ent.Field {
return []ent.Field{
field.Int("age").
Positive(),
field.String("name").
NotEmpty(),
}
}
// -------------------------------------------------
// Schema definition
// User schema mixed-in the TimeMixin and DetailsMixin fields and therefore
// has 5 fields: `created_at`, `updated_at`, `age`, `name` and `nickname`.
type User struct {
ent.Schema
}
func (User) Mixin() []ent.Mixin {
return []ent.Mixin{
TimeMixin{},
DetailsMixin{},
}
}
func (User) Fields() []ent.Field {
return []ent.Field{
field.String("nickname").
Unique(),
}
}
// Pet schema mixed-in the DetailsMixin fields and therefore
// has 3 fields: `age`, `name` and `weight`.
type Pet struct {
ent.Schema
}
func (Pet) Mixin() []ent.Mixin {
return []ent.Mixin{
DetailsMixin{},
}
}
func (Pet) Fields() []ent.Field {
return []ent.Field{
field.Float("weight"),
}
}
- 简单说明
以上代码实现了DetailsMixin 以及TimeMixin 两个Mixin 我们在User 以及Pet中通过添加 Mixin 方法实现了复用