Storing information from JSON into an object

I am encountering an issue regarding transferring data from JSON to an object.

Although this solution is functional, it is not entirely satisfactory. Take a look at the service. Is there an improved method for handling data conversion from this JSON to an object?

The JSON received from the server appears as follows:

{"documents": {"document": [
  {
  "id": 1,
  "description": "Lorem ipsum",
  "date": "2017-03-01"
},{
  "id": 2,
  "description": "Lorem ipsum",
  "date": "2017-04-01"
}
]}}

Here is my service:

 downloadDocuments(id: number): Observable<DocumentsDTO[]>{
   let headers = new Headers();
   headers.append('Content-Type', 'application/json');
   headers.append('Authorization', this.authorizationService.basic);
   let options = new RequestOptions({headers: headers});
   let body = JSON.stringify(id);
   return this.http
     .post(DOCUMENTS_URL, body, options)
     .map((response) => response.json().documents.document)
 }

Below is the component where I invoke this service:

documentsArray: Array<DocumentsDTO>;

downloadUserDocuments(id: number) {
   this.documentsService.downloadDocuments(id)
     .subscribe(documents =>{
       if(documents !=null){
         this.documentsArray = [];
         documents.forEach((data) => {
           this.documentsArray.push(data);
         });
       }
     });
 }

While this approach serves its purpose, I believe there may be room for improvement in terms of converting this JSON to an array. Any suggestions for enhancing this process?

Answer №1

Assistance

using this.http
  .post(DOCUMENTS_URL, body, options)
  .map((res: Response) => {
    res.json().map((obj) => {
      new Document(obj.id, obj.description, obj.date)
    })
  })

The output should be a group of Documents

Answer №2

I don't see a way around the issue

.map((response) => response.json().documents.document)

The array is directly nested inside the response, so changing this would require modifications to the backend.

What puzzles me is the unnecessary iteration within your subscribe function. Why not simply assign the incoming array to documentsArray directly like this:

this.documentsService.downloadDocuments(id)
  .subscribe(documents => {
     if (documents != null) {
       this.documentsArray = documents;
    }
 });

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