Error TS7053 occurs when an element is given an 'any' type because a 'string' expression is being used to index an 'Object' type

When attempting to post data directly using templateDrivenForm and retrieve data from Firebase, I encountered the following type error message.

Here are the relevant parts of my code:

// Posting data directly using submitButton from templateDrivenForm
onCreatePosts(postDatas:{title:string, content:string}){
this.http.post('https://ng-complete-guide-b3d7f-default-rtdb.firebaseio.com/posts.json',
 postDatas)
.subscribe(
 responseData => {
  console.log(responseData);
 });
 }

 // Retrieving data from database
   private fetchPost(){
     return this.http.get('https://ng-complete-guide-b3d7f-default-rtdb.firebaseio.com/posts.json')
   .pipe(map(responseData =>  {
     const dataArray = [];
    for(let key in responseData){
    if(responseData.hasOwnProperty(key)){
    dataArray.push({...responseData[key], id:key});
    }
  }
  return dataArray;
 }))
  .subscribe( responseData => {
  console.log(responseData)
 })
}

The error I am experiencing is:

Error: src/app/app.component.ts:40:28 - error TS7053: Element implicitly has an 'any' type 
because
expression of type 'string' can't be used to index type 'Object'.
No index signature with a parameter of type 'string' was found on type 'Object'.

40         dataArray.push({...responseData[key], id:key});

Answer №1

the resolution

      function getPosts(){
      return this.http.get('https://ng-complete-guide-b3d7f-default- 
      rtdb.firebaseio.com/posts.json')
    .pipe(map((responseData:{[data:number]:any}) =>  {
     const dataArray = [];
     for(let key in responseData){
  if(responseData.hasOwnProperty(key)){
    dataArray.push({...responseData[key], id:key});
  }
  }
    return dataArray;
  }))
 .subscribe( responseData => {
  console.log(responseData)
 })
 }

 .pipe(map((responseData:{[data:number]:any}) //object type

Answer №2

The Firebase nested object can be transformed into the following data type within the map function:
responseData:{[key:string]:any}

private fetchPosts() {
   this.http
     .get('https://ng-complete-guide-b3d7f-default- 
     rtdb.firebaseio.com/posts.json')
     .pipe(map(
       (responseData:{[key:string]:any}) => {
       const dataArray = [];
       for (const key in responseData) {
         if(responseData.hasOwnProperty(key)){
           dataArray.push({ ...responseData[key], id:key})
         }
       }
       return dataArray;
     }))
     .subscribe(posts => {
       console.log(posts);
     });
 }

I concur that minimizing the use of 'any' is advisable. If you come across a more precise type compatible with the newest Angular release, please do share it!

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