AngularFirebase2：使用 equalTo 查询列表

Question

我在 Firebase 上有这样的对象列表：

- members
  -KkN7J3duEB0Lqz01S7v
      |- address: "Chicago Ave, Minneapolis, MN, USA"
      |- isDeleted: true

我想查询 "isDeleted" 是否为假，这是我的代码片段：

return this.database.list('/members', {
  query: {
    limitToLast: (pageNumber * this.pageSize),
    equalTo: {
      value: false,
      key: 'isDeleted'
    }
  }
})

但是，浏览器控制台给出了这个错误：

core.es5.js:1084 ERROR Error: Query: When ordering by priority, the first argument passed to startAt(), endAt(), or equalTo() must be a valid priority value (null, a number, or a string).
    at Qh (database.js:231)
    at U.webpackJsonp../node_modules/firebase/database.js.g.Nd (database.js:240)
    at U.webpackJsonp../node_modules/firebase/database.js.g.If (database.js:242)
    at MapSubscriber.project (firebase_list_factory.js:31)
    at MapSubscriber.webpackJsonp../node_modules/rxjs/operator/map.js.MapSubscriber._next (map.js:77)
    at MapSubscriber.webpackJsonp../node_modules/rxjs/Subscriber.js.Subscriber.next (Subscriber.js:89)
    at SafeSubscriber._next (query_observable.js:59)
    at SafeSubscriber.webpackJsonp../node_modules/rxjs/Subscriber.js.SafeSubscriber.__tryOrUnsub (Subscriber.js:238)
    at SafeSubscriber.webpackJsonp../node_modules/rxjs/Subscriber.js.SafeSubscriber.next (Subscriber.js:185)
    at Subscriber.webpackJsonp../node_modules/rxjs/Subscriber.js.Subscriber._next (Subscriber.js:125)

请指教。谢谢！

Answer 1

我认为您需要将 orderByChild: 'isDeleted' 添加到查询中。并确保更新您的数据库规则。

Answer 2

解决方法是：

return this.database.list('/members', {
  query: {
    orderByChild: 'isDeleted',
    equalTo: false,
    limitToLast: (pageNumber * this.pageSize) 
  }
})

AngularFirebase2：使用 equalTo 查询列表

AngularFirebase2: Query list with equalTo

javascript

firebase

firebase-realtime-database

angularfire2