如何在 AWS Amplify GraphQL 客户端中进行过滤 [英] How to do filteration in AWS Amplify GraphQL Client

问题描述

我正在尝试使用 Amplify GraphQL 客户端实现 GraphQL 过滤器.我得到了一个待办事项列表，想检索状态为已完成的待办事项列表.

I'm trying to implement GraphQL filter using Amplify GraphQL Client. I got a list of todos and wanted to retrieve list of todos that has status complete.

文档只展示了如何获取所有项目和单个项目

The Documentation only show how to get all items and single item

const allTodos = await API.graphql(graphqlOperation(queries.listTodos));
console.log(allTodos);

有人可以指点我如何将过滤器应用于 listTodos 以便它仅返回状态为完成的待办事项.

Could someone please point me how to apply filter to the listTodos so that it return todos with status complete only.

我尝试执行以下操作，但这是错误的.

I tried to do the following but it is wrong.

API.graphql(graphqlOperation(queries.listTodos(filter: {
    status: {
        eq: "completed"
    }
})));

推荐答案

我想我已经回答了您的问题，但我也有一个关于 AWS Amplify codegen 查询、突变、等等.如果你查看在 ~/graphql 文件夹中生成的代码，你会发现一个类似于这样的声明文件:

I think I have an answer to your question, but I also have a similar question regarding the AWS Amplify codegen queries, mutations, etc. If you look at the code that was generated inside of ~/graphql folder, you'll find a declaration file similar to this:

export const listOrganizations = `query ListOrganizations(
  $filter: ModelOrganizationFilterInput
  $limit: Int
  $nextToken: String
) {
  listOrganizations(filter: $filter, limit: $limit, nextToken: $nextToken) {
    items {
      id
      name
      address
    }
    nextToken
  }
}
`;

您可以在此处看到 ListOrganizations 查询的第一个参数(在您的情况下为 ListTodos 查询)采用 filter 的第一个参数:$filter.到目前为止，我已经发现您可以通过执行以下操作来修改此查询...

You can see here that the first parameter to the ListOrganizations query (in your case, ListTodos query) takes a first argument of filter: $filter. I have figured out so far that you can modify this query by doing the following...

API.graphql(graphqlOperation(queries.listTodos, {
    filter: {
        status: {
            eq: "completed"
        }
    }
})));

这应该过滤掉所有 Todo，除了那些 status 等于 completed 的 Todo.我遇到的问题是我想启用不同级别的访问控制，以便任何拥有 Admin 的 Cognito 用户池组的人都可以查看 @model 以及@owner.我能够使用 @auth 转换器使这一切正常工作，但现在我的问题是在某些屏幕上，我只想显示某些属于 owner 的实体那个实体的，因为我也是 Admin，API 默认让我得到一切.我想使用这个 @filter 或 ModelOrganizationFilterInput 只给我我是所有者的数据.我发现这样做的唯一方法是将 owner 字段添加到我的架构中，但是 API 总是提供所有者字段，我想过滤掉该字段.

This should filter out all Todos except the ones where their status is equal to completed. The problem that I am having is that I want to enable different levels of access control such that anyone with a Cognito User Pool Group of Admin may view @model as well as the @owner. And I was able to get this all working using the @auth transformer, but now my problem is that on some screens, I only want to display certain entities that are the owner of that entity and because I am also an Admin, the API defaults to getting me everything. I want to use this @filter or ModelOrganizationFilterInput to only give me the data where I am the owner. The only way I have found to do this was to add the owner field to my Schema, but then the API always provides the owner field and I want to filter that field out.

我能找到的关于 aws-amplify API 和 graphqlOperation 方法的唯一文档在这里:https://aws-amplify.github.io/docs/js/api 但例子并不多并且它们没有展示 API 如何在客户端上工作.我被卡住了.

The only documentation that I can find on how the aws-amplify API and graphqlOperation methods is here: https://aws-amplify.github.io/docs/js/api but there are not many examples and they don't show much of how the API works on the client. I'm stuck.

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