如何在graphql突变中设置多对多关系? [英] how to set many-to-many relation in graphql mutation?

问题描述

我可能会丢失一些东西，但是在Apollo文档上找不到有关创建新条目时如何设置多对多关系的任何信息.

I may be missing something, but can not find any information on Apollo docs about the way to set a many-to-many relation when creating a new entry.

关系为一对多时，就像在多边对象中设置关系的一侧的ID一样简单.

When the relation is one-to-many it is as simple as setting the ID of the one-side of the relationship in the many-side object.

但是，假装我正在与书籍和作者"一起工作，我该如何编写一个graphql查询来为一个(或多个)作者创建一本书?

But let's pretend I am working with Books and Authors, how would I write a graphql query that creates a Book for one (or many?) Authors?

推荐答案

这可能应该在GraphQL服务器(即架构)的API层上发生.对于多对多关系，您应该有一个联接"类型来表示BookAuthor多对多关系，然后向该联接类型添加一个条目.

This should probably happen at the API layer on the GraphQL server (i.e. schema). For many-to-many relationships, you should have a "join" type to denote the BookAuthor many-to-many relationship, and then add an entry to that join type.

基本上，您将拥有一个名为Book的类型，另一个名为Author的类型，最后还有一个名为BookAuthor的类型.您可以添加一些变体来管理这种关系.也许...

Essentially then you'll have a type called Book, another called Author, and finally one more called BookAuthor. And you can add a few mutations to be able to manage that relationship. Perhaps...

• addToBookAuthorConnection
• updateBookAuthorConnection
• removeFromBookAuthorConnection

• addToBookAuthorConnection
• updateBookAuthorConnection
• removeFromBookAuthorConnection

这是使用符合中继规范的API的常规设置.您可以详细了解如何为多对多结构化API关系.

This is a conventional setup using a Relay-spec compliant API. You can read more about how to structure your API for many-to-many relationships here.

然后，您只需要从Apollo调用addToBookAuthorConnection突变，即可在前端添加到多对多连接.

Then, you only need to call the addToBookAuthorConnection mutation from Apollo instead to be able to add to that many-to-many connection on your frontend.

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