Exploring how AngularJS can utilize the $resource API for handling HTTP

http://docs.angularjs.org/api/ngResource.$resource

In the provided link, an example is given as follows:

// Defining a CreditCard class
var CreditCard = $resource('/user/:userId/card/:cardId',
 {userId:123, cardId:'@id'}, {
  charge: {method:'POST', params:{charge:true}}
 });

// Fetching a collection from the server
var cards = CreditCard.query(function() {
  // GET: /user/123/card
  // Server response: [ {id:456, number:'1234', name:'Smith'} ];

  var card = cards[0];
  // Each item represents an instance of CreditCard
  expect(card instanceof CreditCard).toEqual(true);
  card.name = "J. Smith";
  // Non-GET methods are applied to the instances
  card.$save();
  // POST: /user/123/card/456 {id:456, number:'1234', name:'J. Smith'}
  // Server response: {id:456, number:'1234', name: 'J. Smith'};

  // Custom method also functions correctly.
  card.$charge({amount:9.99});
  // POST: /user/123/card/456?amount=9.99&charge=true {id:456, number:'1234', name:'J. Smith'}
});

// Creating a new instance
var newCard = new CreditCard({number:'0123'});
newCard.name = "Mike Smith";
newCard.$save();
// POST: /user/123/card {number:'0123', name:'Mike Smith'}
// Server response: {id:789, number:'01234', name: 'Mike Smith'};
expect(newCard.id).toEqual(789);

In the code snippet, you will find this line:

var card = cards[0];
  1. I am unsure about the origin of the array cards. It seems to be referenced at the previous line, but it appears out of the function scope.

  2. Regarding the jasmine expect function, I question if Angular executes it and generates any errors?

Lines featuring the expect() function include:

expect(card instanceof CreditCard).toEqual(true);

This function is typically used for Jasmine testing; however, there is no direct indication of Jasmine being present in the browser/Angular environment mentioned.

Answer №1

In response to your first inquiry, the specific line you are inquiring about (var card = cards[0];) is actually found within the success callback of the query function. This indicates that the execution was successful, allowing the cards variable to be populated. The scope of the cards variable is not limited; it can be accessed within the callback function or any other function. Generally, it is recommended not to utilize the cards variable outside the success callback scope due to its asynchronous nature.

Could you provide further details regarding question 2?

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