回调

原文：https://gobuffalo.io/documentation/database/callbacks/

Callbacks 回调

Pop provides a means to execute code before and after database operations. This is done by defining specific methods for your models.

​ Pop 提供了一种在数据库操作之前和之后执行代码的方法。这是通过为您的模型定义特定方法来完成的。

For example, to hash a user password you may want to define the following method:

​ 例如，要对用户密码进行哈希处理，您可能需要定义以下方法：

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type User struct {
  ID       uuid.UUID
  Email    string
  Password string
}

func (u *User) BeforeCreate(tx *pop.Connection) error {
  hash, err := bcrypt.GenerateFromPassword([]byte(u.Password), bcrypt.DefaultCost)
  if err != nil {
    return errors.WithStack(err)
  }

  u.Password = string(hash)

  return nil
}

In the above example, when the connection’s Save method is called with a User, the BeforeCreate method will be called before writing to the database.

​ 在上面的示例中，当连接的 Save 方法使用 User 调用时， BeforeCreate 方法将在写入数据库之前调用。

The available callbacks include:

​ 可用的回调包括：

• BeforeSave
• BeforeCreate
• BeforeUpdate
• BeforeDestroy
• BeforeValidate
• AfterSave
• AfterCreate
• AfterUpdate
• AfterDestroy
• AfterFind

Related Content 相关内容

• Models - Define a database model. 模型 - 定义数据库模型。