Understanding Restangular with Typescript can be challenging, especially when dealing with a 'restangularized' response object

In my project, I am working with Angular 1.5.x using TypeScript in combination with restangular to access a remote API. Here is an overview of the scenario:

The API endpoint I am connecting to is

http://localhost:53384/api/timezones
. Making a GET request to this URL returns a JSON array containing timezone data.

[
   {
      "code":"Dateline Standard Time",
      "name":"(UTC-12:00) International Date Line West"
   },
   {
      "code":"UTC-11",
      "name":"(UTC-11:00) Coordinated Universal Time-11"
   },
   {
      "code":"Hawaiian Standard Time",
      "name":"(UTC-10:00) Hawaii"
   }
]

Within my AngularJs application on the client side written in TypeScript:

Configuring Restangular with restangularProvider: restangular.IProvider

restangularProvider.setBaseUrl("http://localhost:53384/api");

Defining the TimeZone object representation in TypeScript

module app.blocks {
    "use strict";

    export class TimeZone {
        public code: string;
        public name: string;
    }
}

Creating a factory(restangular.IService) to wrap the restangular 'timezones' resource

module app.services {
    factory.$inject = ["Restangular"];

    function factory(restangular: restangular.IService): restangular.IElement {
        return restangular.all("timezones");
    }

    angular
        .module("app.services")
        .factory("app.services.TimeZonesRestangular", factory);
}
... (additional sections omitted for brevity)

There are two main issues I am encountering:

  1. When observing the response from the successCallback in the getTimeZones() method, it seems that the defined type TimeZone[] does not accurately represent the returned data structure. The objects in the array have additional properties related to restangular features. How can I update the interface definition to account for these extra attributes?

  2. Is there any example or guideline available demonstrating how to handle similar situations in TypeScript?

Any insights or advice would be greatly appreciated. Thank you.

Answer №1

Upon further investigation, I discovered that the optimal approach is to anticipate a promised value of type restangular.ICollection (which extends IService and Array<any>) in order to de-restangularize the response as shown below:

public getTimeZones(): ng.IPromise<blocks.TimeZone[]> {
            return this.timeZonesRestangular.getList()
                .then((restangularizedTimeZones: restangular.ICollection) => {
                    return restangularizedTimeZones.plain();
                }, (restangularError: any) => {
                    throw "Error retrieving time zones. Status: " + restangularError.status;
                });
        }

Now everything appears to be resolved and the response is indeed a promise of TimeZone[]

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