一对一关联

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原文：https://gobuffalo.io/documentation/database/relations-one-to-one/

One to One Associations 一对一关联

In this chapter, you’ll learn how to write a one to one association in Pop.

​ 在本章中，您将学习如何在 Pop 中编写一对一关联。

Tags 标签

One to one associations work using a pair of tags:

​ 一对一关联使用一对标签：

  • belongs_to for the model with the foreign key. belongs_to 用于具有外键的模型。
  • has_one for the model without the foreign key. has_one 用于没有外键的模型。

Example 示例

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// Models

type Head struct {
  ID           int
  BodyID       int        `db:"body_id"`
  Body         *Body      `belongs_to:"body"`
}

type Body struct {
  ID           int
  Head         Head       `has_one:"head"`
}
// Eager creation:
// Create a body with its head.
b := &models.Body{
    Head: models.Head{},
}

if err := tx.Eager().Create(b); err != nil {
    return err
}
// Eager fetch all bodies with their head.
bodies = &models.Bodies{}

if err := c.Eager().All(bodies); err != nil {
    log.Printf("err: %v", err)
    return
}

log.Printf("eager fetch: %v", bodies)

Related Content 相关内容

  • Associations with Pop: 1 to 1 - An article about 1 to 1 associations in Pop. 使用 Pop 的关联：1 对 1 - 一篇关于 Pop 中 1 对 1 关联的文章。
最后修改 October 10, 2024: 更新 (a4b8f85)