通过一种组合方法使用react-redux-firebase查询用户特定数据(包括填充) [英] Querying user specific data (incl. population) with react-redux-firebase in one compose method

问题描述

我正在与react-native一起使用，并遇到了使用 firebaseConnect 仅加载特定于用户的数据的问题.想象一下，有大量的 todos ， users 和 doers ，并且不想引用它们的所有元素.

i'm working with react-native and have the problem to load only user specific data with firebaseConnect. Imagine there are thousends of todos, users and doers and don't want to reference all elements of them.

首先，我的实时数据库中数据结构的快捷方式:

First of all, a shortcut of my data structure in the real time database:

- todos
  |- cleanRoom
  |    |- createdBy: alica
  |    |- title: "Clean the room up"
  |    |- doerList
  |        |- roomCleanerMichael
  |        |- roomCleanerAlica
  |- playBall
       |- createdBy: michael
       |- title: "Play the ball"
       |- doerList
           |- ballPlayerAlica

- users
  |- michael
  |    |- name: Michael
  |    |- age: 22
  |- alica
       |- name: Alica
       |- age: 27

- doers
  |- roomCleanerMichael
  |    |- user: michael
  |    |- status: done
  |- roomCleanerAlica
  |    |- user: alica
  |    |- status: done
  |- ballPlayerAlica
       |- user: alica
       |- status: done

我在RN中有一个视图/屏幕，应在其中显示所有信息.现在，我有...

I have a view/screen in RN, where all informations should be displayed. For now, i have...

const populatesTodoCreator = [{child: 'createdBy', root: 'users'}]

const mapStateToProps = (state, props) => {
  return {
    todos: populate(state.firebase, 'todos', populatesTodoCreator),
    uid: state.firebase.auth.uid
  }
}

export default compose(
  firebaseConnect((props, store) => {
      return [
        {path: 'todos', populatesTodoCreator},
      ]
    }
  ),
  connect(mapStateToProps, mapDispatchToProps)
)(TodoOverviewScreen)

当我使用 firebase.auth.uid = michael 登录应用程序时，我只想引用 todos 的列表，其中 michael 以 doer 的身份参与，并填充 doersList 中的所有 doers (包括特定 doer中的 user )，并且仅用一种 compose 方法即可.

When i log in the application with firebase.auth.uid = michael, i only want to reference the list of todos, where michael participates in as doer and populate all doers in doersList (including the user in a specific doer), and that all in only one single compose method.

因此，最终的redux状态应如下所示，因为 michael 只是cleanRoom的 doer :

So the resulting redux state should look like this, because michael is only a doer for cleanRoom:

- todos
  |- cleanRoom
      |- createdBy
      |    |- name: Alica
      |    |- age: 27
      |- title: "Clean the room up"
      |- doerList
           |- roomCleanerMichael
           |     |- user
           |     |    |- name: Michael
           |     |    |- age: 22
           |     |- status: done
           |- roomCleanerAlica
                 |- user
                 |    |- name: Alica
                 |    |- age: 27
                 |- status: done

此任务可能吗?如果是，我该怎么做?有什么结构性建议吗?

Is this task possible? If yes, how do i get this done? Any structural suggestions?

推荐答案

由另一个填充参数填充诸如 doerList 之类的列表.

Populating a list like doerList is done by another populate parameter.

将填充数组更改为...

Changing the populate array to...

const populatesTodoCreator = [
  { child: 'createdBy', root: 'users' },
  { child: 'doerList', root: 'doers' } // populates the whole list of elements
]

为我工作.

仅查询登录用户参与的 todos ，并在 doer 对象中填充 user (以获取预期的结果)结果)是另一个问题.

Querying only the todos, where the logged in user is participating in and populating the user within the doer object (to get the expected result) is another question.

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