AngularFire Firestore 属性 'map' 在类型 'Action<DocumentSnapshot<any>>' 上不存在

AngularFire Firestore Property 'map' does not exist on type 'Action<DocumentSnapshot<any>>'

我正在关注有关集合的 firebase docs,但无法弄清楚为什么我的代码在尝试检索具有文档 ID 的文档集合时无法按照文档工作。

我的 IDE 显示以下错误:

Property 'map' does not exist on type 'Action< DocumentSnapshot< any>>'.

对于以下代码:

this.userDocRef = this.afs.doc<any>(`users/${user.uid}`);
this.userDoc$ = this.userDocRef.snapshotChanges().pipe(
  map(actions => {
    return actions.map(a => { // error throws here
      const data = a.payload.doc.data() as any;
      const id = a.payload.doc.id;
      return { id, ...data };
    })
  })
)

当我 运行 此代码时,出现以下错误:

ERROR TypeError: actions.map is not a function

如何重构它以使其正常工作?

"firebase": "^5.0.4"
"@angular/core": "^6.1.0"
"angularfire2": "^5.0.0-rc.10"

您的映射代码有误:

map(actions => {
    return actions.map(a => { // error throws here
      const data = a.payload.doc.data() as any;
      const id = a.payload.doc.id;
      return { id, ...data };
    })
 })

这用于映射集合。您不是在迭代一个集合,而是在单个文档

尝试:

this.userDoc$ = this.userDocRef.snapshotChanges()
    .pipe(
        map(action => {
            const data = action.payload.data();
            const id = action.payload.id;
            return { id, ...data };
        })
     );