Javascript 错误：Reference.child失败：第一个参数是无效路径

我有一个带有Firebase的小应用程序，我正在实施CRUD操作。当我不得不删除帖子时，问题就来了。我收到以下错误：

错误：Reference.child失败：第一个参数是无效路径

以下是服务代码：

createReview(review) {
  return this.db.list('/reviews').push(review)
}

getReviews(){
  return this.db.list('/reviews');
}

deleteReview(id:any){
  console.log(id)
  this.db.object('/reviews/' + id).remove();
}

组件TS

 delete(review) {
    console.log(review)
    this.movieService.deleteReview(review)
  }

HTML

编辑：package.JSON@Frank van Puffelen

{
  "name": "MoviesDB",
  "version": "0.0.0",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e"
  },
  "private": true,
  "dependencies": {
    "@angular/animations": "~8.1.0",
    "@angular/common": "~8.1.0",
    "@angular/compiler": "~8.1.0",
    "@angular/core": "~8.1.0",
    "@angular/fire": "^5.4.2",
    "@angular/forms": "~8.1.0",
    "@angular/http": "^7.2.15",
    "@angular/platform-browser": "~8.1.0",
    "@angular/platform-browser-dynamic": "~8.1.0",
    "@angular/router": "~8.1.0",
    "@auth0/angular-jwt": "^3.0.1",
    "@fortawesome/angular-fontawesome": "^0.5.0",
    "@fortawesome/fontawesome-svg-core": "^1.2.27",
    "@fortawesome/free-solid-svg-icons": "^5.12.1",
    "@ng-bootstrap/ng-bootstrap": "^5.1.4",
    "angular-jwt": "^0.1.11",
    "angular2-jwt": "^0.2.3",
    "bootstrap": "^4.4.1",
    "firebase": "^7.9.1",
    "jsonwebtoken": "^8.5.1",
    "mongoose": "^5.8.1",
    "ng-starrating": "^1.0.11",
    "ng2-validation": "^4.2.0",
    "ngx-embed-video": "^1.0.4",
    "rxjs": "~6.4.0",
    "rxjs-compat": "^6.5.3",
    "simple-oauth2": "^3.1.0",
    "source-map": "^0.7.3",
    "tslib": "^1.9.0",
    "zone.js": "~0.9.1"
  },
  "devDependencies": {
    "@angular-devkit/build-angular": "^0.801.3",
    "@angular/cli": "~8.1.0",
    "@angular/compiler-cli": "~8.1.0",
    "@angular/language-service": "~8.1.0",
    "@types/jasmine": "~3.3.8",
    "@types/jasminewd2": "~2.0.3",
    "@types/node": "~8.9.4",
    "codelyzer": "^5.2.0",
    "jasmine-core": "~3.4.0",
    "jasmine-spec-reporter": "~4.2.1",
    "karma": "~4.1.0",
    "karma-chrome-launcher": "~2.2.0",
    "karma-coverage-istanbul-reporter": "~2.0.1",
    "karma-jasmine": "~2.0.1",
    "karma-jasmine-html-reporter": "^1.4.0",
    "protractor": "~5.4.0",
    "ts-node": "~7.0.0",
    "tslint": "~5.15.0",
    "typescript": "~3.4.3"
  }
}

---

您似乎正在将

p

的含义从

post

更改为

id

。假设每个

post

都有一个

id

属性，您可能需要：

delete(post) {
  this.postService.deletePost(post.id)
}

@弗兰克·范·帕夫伦 快照机会（）是解决方案。此方法从firebase中要删除的节点返回id。因此，在服务中，我得到如下评论：

getReviews() {
    return this.db.list('/reviews').snapshotChanges();
  }

HTML应该是

 <button (click)="delete(r.key)" class="btn btn-danger">Delete</button>

---

没有错误，但是帖子仍然是@Frank van Puffele，如果我在服务上记录id，它是未定义的，所以这就是为什么什么都没有发生我需要获取uid吗？我不知道为什么你需要在这里获取uid。我回答的第一行有意义吗？您似乎将

post

解释为一个

id

，这是行不通的。我的代码只是一个猜测，你可能会如何修复它，但隐式转换几乎是肯定的。对不起，是的，我知道它，但我不能使它工作，或者我得到了错误，或者我得到了undefinedGood听到你找到了解决方案！

getReviews() {
    return this.db.list('/reviews').snapshotChanges();
  }

 <button (click)="delete(r.key)" class="btn btn-danger">Delete</button>

deleteReview(id: any) {
    console.log(id)
    this.db.object('reviews/' + id).remove();
  }