Question

已安装的依赖项

"@angular/cli": "1.6.6"
"angularfire2": "5.0.0-rc.6",
"firebase": "4.12.1",
"rxjs": "^5.5.10",
"rxjs-compat": "^6.3.3",

我的进口货

import { AngularFireAuth } from 'angularfire2/auth';
import { AngularFireDatabase, FirebaseListObservable } from 'angularfire2/database-deprecated';
import { Observable } from 'rxjs/Observable';
import * as firebase from 'firebase/app';

尝试使用以下方法查询FirebaseDatabase

getMessages(): FirebaseListObservable<ChatMessage[]> {
   // Query create list binding
   return this.db.list('messages', {
     query: { limitToLast: '25' }
   });
}

内部版本在控制台中返回以下错误

error TS2345: Argument of type '{ query: { limitToLast: string; }; }' 
is not assignable to parameter of type 'FirebaseListFactoryOpts'.
Types of property 'query' are incompatible.

Type '{ limitToLast: string; }' is not assignable to type 'Query'.
  Property 'endAt' is missing in type '{ limitToLast: string; }'.

Answer 1

问题解决了！

将angularFire2更新为最新版本

npm install firebase @angular/fire --save

更改了导入（将FirebaseListObservable替换为AngularFireList）

import { AngularFireDatabase, AngularFireList } from 'angularfire2/database';

接口模型文件中发送的时间已从“日期=新的Date（）”更改为“字符串”

去掉了方括号

chatMessages: AngularFireList<ChatMessage>;
getMessages(): AngularFireList<ChatMessage> {
  // changed the query since the AngularFireList does it differently.
  return this.db.list('messages', ref => ref.orderByKey().limitToLast(25));
}

内置于Angular 6 x AngularFire2投掷错误的聊天应用程序

1 个答案: