Where should I create data models?

Ionic Framework ionic-v3
2

I have found “just a data model with some helper functions” to be a generally bad fit for the JavaScript world. I have had better luck with smart providers and dumb data, so I would do something like this:

export interface Customer {
  id: string;
  name: string;
}

export interface Purchase {
  id: string;
  customerId: string;
  productId: string;
  quantity: number;
}

@Injectable()
export class Provider {
  constructor(private _http: Http) {}

  customerById(id: string): Observable<Customer> {
    return this._http.get('/api/customer/' + id).map(rsp => rsp.json());
  }

  purchasesByCustomer(id: string): Observable<Purchase[]> {
    return this._http.get('/api/purchases?customer=' + id).map(rsp => rsp.json().purchases);
  }
}

EDIT: I don’t know if it’s still a problem, but due to previous security concerns about naked JSON arrays, I always make my APIs return objects with a single array member instead of a raw array. Edited purchasesByCustomer() to reflect that.

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