Computed attribute in Entity?

[normalllll]

I have encountered some difficulties in migrating from entgo to sea-orm.

like this

package schema

import (
	"entgo.io/contrib/entproto"
	"entgo.io/ent"
	"entgo.io/ent/schema"
	"entgo.io/ent/schema/field"
	"entgo.io/ent/schema/mixin"
	"time"
)

type ModelMixin struct {
	mixin.Schema
}

func (ModelMixin) Fields() []ent.Field {
	return []ent.Field{
		field.Int64("id").Annotations(entproto.Field(1)),
		field.Int64("created_at").Annotations(entproto.Field(2)).
			DefaultFunc(
				func() int64 {
					return time.Now().Unix()
				},
			),
		field.Int64("updated_at").Annotations(entproto.Field(3)).
			DefaultFunc(
				func() int64 {
					return time.Now().Unix()
				},
			).
			UpdateDefault(
				func() int64 {
					return time.Now().Unix()
				},
			),
	}
}

func (ModelMixin) Annotations() []schema.Annotation {

	return []schema.Annotation{
		entproto.Message(),
	}
}

• Need to add a new Mixin features
• Need to define your own types created_at and updated_at, which are generated through rust functions rather than through the database.

---

func (User) Fields() []ent.Field {
	return []ent.Field{
		field.Int64("parent_id").Optional().Nillable().Annotations(entproto.Field(4)),
		field.String("parent_name").Optional().Nillable().Annotations(entproto.Field(5)),
		field.String("name").Annotations(entproto.Field(6)),
		field.String("account").Unique().Annotations(entproto.Field(7)),
		field.String("password").Annotations(entproto.Skip()),
	}
}

In addition, sea-orm seems to have no hook function. If you need to update parent_name based on the User pointed to by parent_id when updating parent_id, additional logic is required.

like this

hook.On(
    func(next ent.Mutator) ent.Mutator {
	    return hook.UserFunc(func(ctx context.Context, m *gen.UserMutation) (ent.Value, error) {
		    if pid, exist := m.ParentID(); exist {
    
			    parent, err := m.Client().User.Get(ctx, pid)
			    if err != nil {
				    return nil, err
			    }
			    m.SetParentName(parent.Name)
    
		    }
		    return next.Mutate(ctx, m)
	    })
    },
    ent.OpCreate,
),