angularfire2@5.0.0-rc.10 .snapshotChanges() 不能让你得到 doc.payload.doc.data()

Posted 2023-02-19

【中文标题】angularfire2@5.0.0-rc.10 .snapshotChanges() 不能让你得到 doc.payload.doc.data()

【英文标题】：angularfire2@5.0.0-rc.10 .snapshotChanges() not able to let you get the doc.payload.doc.data()

【发布时间】：2018-11-20 02:40:57

【问题描述】：

版本信息

角度： 6.0.4

Firebase： 5.0.3

AngularFire： 5.0.0-rc.10

ng-test-angular6@0.0.0 /home/amine/docker-projects/ng-test-angular6
├── @angular-devkit/build-angular@0.6.8
├── @angular/animations@6.0.4
├── @angular/cli@6.0.8
├── @angular/common@6.0.4
├── @angular/compiler@6.0.4
├── @angular/compiler-cli@6.0.4
├── @angular/core@6.0.4
├── @angular/forms@6.0.4
├── @angular/http@6.0.4
├── @angular/language-service@6.0.4
├── @angular/platform-browser@6.0.4
├── @angular/platform-browser-dynamic@6.0.4
├── @angular/router@6.0.4
├── @types/jasmine@2.8.8
├── @types/jasminewd2@2.0.3
├── @types/node@8.9.5
├── angularfire2@5.0.0-rc.10
├── codelyzer@4.2.1
├── core-js@2.5.7
├── firebase@5.0.3
├── jasmine-core@2.99.1
├── jasmine-spec-reporter@4.2.1
├── karma@2.0.2
├── karma-chrome-launcher@2.2.0
├── karma-coverage-istanbul-reporter@2.0.1
├── karma-jasmine@1.1.2
├── karma-jasmine-html-reporter@0.2.2
├── protractor@5.3.2
├── rxjs@6.2.0
├── ts-node@5.0.1
├── tslint@5.9.1
├── typescript@2.7.2
└── zone.js@0.8.26

如何重现这些情况

看看the angular project ng-angular6-angularfire5.0.0-rc.10

只需克隆、安装和服务。

调试输出

问题来自该行中的函数L20

  fetchAvailableExercices() 
    this.db.collection('availablesExercices')
    .snapshotChanges()
    .pipe(map( docArray => 
      return docArray.map( doc => 
        console.log(doc);
        return(
           
           id: doc.payload.doc.id,
           name: doc.payload.doc.data().name,
           duration: doc.payload.doc.data().duration,
           calories: doc.payload.doc.data().calories,
         
        //doc
      );
      );
    ))
    .subscribe(exercices => 
      this.availableExercices = exercices;
      this.availableExercicesChanged.next([...this.availableExercices]);
    );
  

我得到的错误是：

Property 'name' does not exist on type ''.
Property 'duration' does not exist on type ''.
Property 'calories' does not exist on type ''.

另外，我无法构建 Angular 应用程序的 prod 版本ng build --prod

但是，如果我按原样获取文档（没有设置名称、持续时间、卡路里），我可以让浏览器控制台获得预期值：

> temp1.payload.doc.data()
calories: 8, duration: 60, name: "Burpees"


  fetchAvailableExercices() 
    this.db.collection('availablesExercices')
    .snapshotChanges()
    .pipe(map( docArray => 
      return docArray.map( doc => 
        console.log(doc);
        return(
        doc
      );
      );
    ))
    .subscribe(exercices => 
      this.availableExercices = exercices;
      this.availableExercicesChanged.next([...this.availableExercices]);
    );
  

预期行为

以下错误Property 'name' does not exist on type ''. 必须消失。 制作产品必须成功

PS： AngularFire：5.0.0-rc.8 不抛出错误消息Property 'name' does not exist on type ''.。然而，它无法构建 Angular 应用程序的 prod 版本。

ng build --prod

Date: 2018-06-10T20:10:08.203Z
Hash: 3395c915a85b5198ef71
Time: 4427ms
chunk 0 runtime.a66f828dca56eeb90e02.js (runtime) 1.05 kB [entry] [rendered]
chunk 1 styles.d651e93934b267387a12.css (styles) 56.5 kB [initial] [rendered]
chunk 2 polyfills.cdf87a8e5b31fe8a11f1.js (polyfills) 130 bytes [initial] [rendered]
chunk 3 main.a2bc6cab25d0aa41c17a.js (main) 128 bytes [initial] [rendered]

ERROR in Error during template compile of 'AppModule'
  Function calls are not supported in decorators but 'AngularFireModule' was called.

【问题讨论】：

尝试阅读此符号中的属性，看看是否有效doc.payload.doc.data()['name']

效果很好。谢谢@TroyMyers

【参考方案1】：

您项目中的 angularfire2 和 firebase 版本存在一些问题。

这是我为使事情正常工作所做的：

npm i angularfire2@5.0.0-rc.10 --save
npm i firebase@5.0.4 --save

在您的data.service.ts 中：输入db.collection() 电话

 fetchAvailableExercices() 
    this.db.collection<IExercice>('availablesExercices') //  <== This line
    .snapshotChanges()
    .pipe(map( docArray => 
      return docArray.map( doc => 
        console.log(doc);
        return(
          
          id: doc.payload.doc.id,
          name: doc.payload.doc.data().name,
          duration: doc.payload.doc.data().duration,
          calories: doc.payload.doc.data().calories,
        
      );
      );
    ))
    .subscribe(exercices => 
      this.availableExercices = exercices;
      this.availableExercicesChanged.next([...this.availableExercices]);
    );
  

您的app.module 中还有两句话：

你应该导入 AngularFirestoreModule（注释掉） 这里不需要提供AngularFireStore

属性错误消失了，构建工作正常。 Working example here

【参考方案2】：

使用新版本的AngularFire，代码变为：

  fetchAvailableExercices() 
    this.db.collection('availablesExercices')
    .snapshotChanges()
    .pipe(map( docArray => 
      return docArray.map( doc => 
        console.log(doc);
        return(
           
           id: doc.payload.doc.id,
           name: doc.payload.doc.data()['name'],
           duration: doc.payload.doc.data()['duration'],
           calories: doc.payload.doc.data()['calories'],
         
        //doc
      );
      );
    ))
    .subscribe(exercices => 
      this.availableExercices = exercices;
      this.availableExercicesChanged.next([...this.availableExercices]);
    );
  

构建产品应用程序将很简单。