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mixin.go
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mixin.go
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// Copyright 2019-present Facebook
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package pulid
import (
"entgo.io/ent"
"entgo.io/ent/schema"
"entgo.io/ent/schema/field"
"entgo.io/ent/schema/mixin"
)
// MixinWithPrefix creates a Mixin that encodes the provided prefix.
func MixinWithPrefix(prefix string) *Mixin {
return &Mixin{prefix: prefix}
}
// Mixin defines an ent Mixin that captures the PULID prefix for a type.
type Mixin struct {
mixin.Schema
prefix string
}
// Fields provides the id field.
func (m Mixin) Fields() []ent.Field {
return []ent.Field{
field.String("id").
GoType(ID("")).
DefaultFunc(func() ID { return MustNew(m.prefix) }),
}
}
// Annotation captures the id prefix for a type.
type Annotation struct {
Prefix string
}
// Name implements the ent Annotation interface.
func (a Annotation) Name() string {
return "PULID"
}
// Annotations returns the annotations for a Mixin instance.
func (m Mixin) Annotations() []schema.Annotation {
return []schema.Annotation{
Annotation{Prefix: m.prefix},
}
}