user.go

// Fields of the User.
func (User) Fields() []ent.Field {
   return []ent.Field{
      field.String("name").
         NotEmpty().
         MaxLen(255),
      field.Int("age").
         Positive(),
      field.Time("created_at").
         Default(time.Now).
         SchemaType(map[string]string{
            dialect.MySQL: "datetime DEFAULT CURRENT_TIMESTAMP",
         }).
         Immutable(),
      field.Time("updated_at").
         Default(time.Now).
         SchemaType(map[string]string{
            dialect.MySQL: "datetime DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP",
         }).
         Immutable(),
   }
}