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// Copyright 2019-present Facebook Inc. All rights reserved.
// This source code is licensed under the Apache 2.0 license found
// in the LICENSE file in the root directory of this source tree.
package schema
import (
"github.com/facebook/ent"
"github.com/facebook/ent/schema/edge"
"github.com/facebook/ent/schema/field"
"github.com/facebook/ent/schema/index"
"github.com/facebook/ent/schema/mixin"
)
type Mixin struct {
mixin.Schema
}
func (m Mixin) Fields() []ent.Field {
return []ent.Field{
field.String("mixed_string").
Default("default"),
field.Enum("mixed_enum").
Values("on", "off").
Default("on"),
}
}
// User holds the schema definition for the User entity.
type User struct {
ent.Schema
}
func (User) Mixin() []ent.Mixin {
return []ent.Mixin{
Mixin{},
}
}
// Fields of the User.
func (User) Fields() []ent.Field {
return []ent.Field{
field.Int("id").
StorageKey("oid"),
// changing the type of the field.
field.Int("age"),
// extending name field to longtext.
field.Text("name"),
// changing nickname from unique no non-unique.
field.String("nickname").
MaxLen(255),
// adding new columns (must be either optional, or with a default value).
field.String("phone").
Default("unknown"),
field.Bytes("buffer").
Optional().
DefaultFunc(func() []byte { return []byte("null") }),
// adding new column with supported default value
// in the database side, will append this value to
// all existing rows.
field.String("title").
Default("SWE"),
// change column name and reference it to the
// previous one ("renamed").
field.String("new_name").
Optional().
StorageKey("renamed"),
// extending the blob size.
field.Bytes("blob").
Optional().
MaxLen(1000),
// adding enum to the `state` column.
field.Enum("state").
Optional().
Values("logged_in", "logged_out", "online"),
// convert string to enum.
field.Enum("status").
Optional().
Values("done", "pending"),
// remove the max-length constraint from varchar.
field.String("workplace").
Optional(),
// deleting the `address` column.
}
}
func (User) Edges() []ent.Edge {
return []ent.Edge{
// Edge(children<-M2O->parent) to be dropped.
// Edge(spouse<-O2O->spouse) to be dropped.
edge.To("car", Car.Type),
// New edges to added.
edge.To("pets", Pet.Type).
StorageKey(edge.Column("owner_id")).
Unique(),
edge.To("friends", User.Type).
StorageKey(edge.Table("friends"), edge.Columns("user", "friend")),
}
}
func (User) Indexes() []ent.Index {
return []ent.Index{
// deleting old indexes (name, address),
// and defining a new one.
index.Fields("phone", "age").
Unique(),
}
}
type Car struct {
ent.Schema
}
func (Car) Edges() []ent.Edge {
return []ent.Edge{
// Car now can have more than 1 owner (not unique anymore).
edge.From("owner", User.Type).
Ref("car").
Unique(),
}
}
// Group schema.
type Group struct{ ent.Schema }
// Pet schema.
type Pet struct {
ent.Schema
}
func (Pet) Edges() []ent.Edge {
return []ent.Edge{
edge.From("owner", User.Type).
Ref("pets").
Unique(),
}
}
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