46 lines
1.3 KiB
Markdown
46 lines
1.3 KiB
Markdown
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# RelationRepository
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`RelationRepository` 是关系类型的 `Repository` 对象，`RelationRepository` 可以实现在不加载关联的情况下对关联数据进行操作。基于 `RelationRepository`，每种关联都派生出对应的实现，分别为
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* [`HasOneRepository`](#has-one-repository)
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* `HasManyRepository`
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* `BelongsToRepository`
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* `BelongsToManyRepository`
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## 构造函数
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**签名**
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* `constructor(sourceCollection: Collection, association: string, sourceKeyValue: string | number)`
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**参数**
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| 参数名 | 类型 | 默认值 | 描述 |
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| --- | --- | --- | --- |
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| `sourceCollection` | `Collection` | - | 关联中的参照关系（referencing relation）对应的 Collection |
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| `association` | `string` | - | 关联名称 |
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| `sourceKeyValue` | `string \| number` | - | 参照关系中对应的 key 值 |
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## 基类属性
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### `db: Database`
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数据库对象
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### `sourceCollection`
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关联中的参照关系（referencing relation）对应的 Collection
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### `targetCollection`
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关联中被参照关系（referenced relation）对应的 Collection
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### `association`
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sequelize 中的与当前关联对应的 association 对象
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### `associationField`
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collection 中的与当前关联对应的字段
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### `sourceKeyValue`
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参照关系中对应的 key 值
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