apollo-link-state添加字段,其默认值为

时间:2018-12-12 18:22:00

标签: graphql react-apollo apollo-client apollo-link-state

这是我要完成的工作: 我有一个graphql API端点,可以向我返回一个这样的Project对象(删除了不相关的字段):

{
  "data": {
    "Project": {
      "id": "cjp4b84wkochq0167gpu8oa7h",
      "requests": [
        {
          "id": "cjpbb6jcdpwj00167y4acl5a1",
          "__typename": "Request"
        },
        {
          "id": "cjpbbhlaxpwlx01675jzfyb0j",
          "__typename": "Request"
        },
        {
          "id": "cjpbbifg7pwmg0167s0ob1bm6",
          "__typename": "Request"
        },
      ],
      "__typename": "Project"
    }
  }
}

我想使用apollo-link-state向所有这些Request对象添加一个客户端字段,如下所示:

{
  "data": {
    "Project": {
      "id": "cjp4b84wkochq0167gpu8oa7h",
      "requests": [
        {
          "id": "cjpbb6jcdpwj00167y4acl5a1",
          "expanded": false,
          "__typename": "Request"
        },
        {
          "id": "cjpbbhlaxpwlx01675jzfyb0j",
          "expanded": false,
          "__typename": "Request"
        },
        {
          "id": "cjpbbifg7pwmg0167s0ob1bm6",
          "expanded": false,
          "__typename": "Request"
        },
      ],
      "__typename": "Project"
    }
  }
}

这将允许我从呈现这些请求的组件中删除本地状态。问题是,当我如下定义ApolloClient clientState的默认值时:

const client = new ApolloClient({
  clientState: {
    defaults: {
      Project: {
        __typename: 'Project',
        requests: [{ __typename: 'Request', expanded: false }],
      },
    },
  },
});

Apollo将其添加为新的Project对象,而不是将其添加到现有的ID对象中:

ROOT_QUERY
  Project: Project
    requests: [Request]
      0:
        expanded: false
  Project({"id":"cjp4b84wkochq0167gpu8oa7h"}): Project
    ▾Project:cjp4b84wkochq0167gpu8oa7h

当我给它id时,它将“ hi”字段添加到正确的项目中,但请求仍缺少扩展字段。显然,给出id仅适用于特定项目。

const client = new ApolloClient({
  clientState: {
    defaults: {
      'Project({"id":"cjp4b84wkochq0167gpu8oa7h"})': {
        __typename: 'Project',
        hi: true,
        requests: [{ __typename: 'Request', expanded: false }],
      },
    },
  },
});

ROOT_QUERY
  Project({"id":"cjp4b84wkochq0167gpu8oa7h"}): Project
    ▾Project:cjp4b84wkochq0167gpu8oa7h
      hi: true
      requests: [Request]
        0:▾Request:cjpbb6jcdpwj00167y4acl5a1
          ...unrelated fields
        1:▾Request:cjpbbhlaxpwlx01675jzfyb0j
        2:▾Request:cjpbbifg7pwmg0167s0ob1bm6

我还尝试过在clientState对象上使用typeDefs字段,如下所示:

typeDefs: [`
  schema {
    query: RootQuery
  }

  type RootQuery {
    Project($id: ID): Project
  }

  type Project {
    id: ID!
    requests: [Request]
  }

  type Request {
    id: ID!
    expanded: Boolean
  }
`],

但是这似乎并没有改变缓存中的任何内容,我也不知道是否可以给它这样的默认值。

也许我误解了apollo-link-state的工作方式(甚至是graphql的工作方式),任何将我指向正确方向的答案都值得赞赏。关于graphql或apollo,我非常新手。

1 个答案:

答案 0 :(得分:2)

您需要为clientState配置提供客户端解析器。

const clientState = {
  resolvers: {
    Project {
      expanded: () => false
    }
  }
}

然后将其像这样传递到您的ApolloClient中

const apolloClient = new ApolloClient({ clientState });