Refreshing the Angular resource under observation

Question

Refreshing the Angular resource under observation

My brain feels a bit fried today, so pardon what might seem like an obvious question.

I have a useful resource at my disposal:

Book = $resource("/books/:id", {id: "@id"});
book = Book.get(1);

When I want to refresh the object to receive any updates from the server, I know I can simply repeat book = Book.get(book.id). However, doing so would cause everything on the page that relies on book to temporarily become null until the query returns, potentially causing functions operating on it to crash.

My goal is to create a reload method for instances that automatically updates changed fields once the query results return. Here's my best attempt so far:

$reload = function() {
    var model = this;

    Book.get(model.id, function(data) { // success
      angular.forEach(data, function(value, key) {
          model[key] = value;
      }
    }
}

I have two questions: a) Is this considered the "angular" way to achieve this, or is there a more elegant approach? b) How can I incorporate this $refresh method when defining the resource so that it is included in every instance created?

javascript angularjs angular-resource

Answer 1

Answer №1

Here's a way to expand the prototype:

var Book = $resource("/books/:id", {id: "@id"});
Book.prototype.loadNewData = function(callback) {
    return this.get(this.id, callback);
}

var book = Book.get(1);
book.loadNewData(function(data){console.log(data);});

Special thanks to: @jenny-smith (Jenny Smith) for reviewing and enhancing my code.

Answer 2

Here's a way to expand the prototype:

var Book = $resource("/books/:id", {id: "@id"});
Book.prototype.loadNewData = function(callback) {
    return this.get(this.id, callback);
}

var book = Book.get(1);
book.loadNewData(function(data){console.log(data);});

Special thanks to: @jenny-smith (Jenny Smith) for reviewing and enhancing my code.

Answer 3

Answer №2

Here are a couple of ideas to consider:

To ensure your model is structured correctly, follow the $resource documentation which states that having an empty object initially will prevent rendering until data is received from the server and then automatically update the view.

Create your own Angular Service for API interactions in order to have more control over asynchronous behavior:

yourApp.factory('BookService', function($q) {

   //Other API calls can be included here

   function reload() {
      var deferred = $q.defer();

      $http.get('/someUrl').
      success(function(data, status, headers, config) {
         //Process the data as needed...then
         deferred.resolve(data);
      }).
      error(function(data, status, headers, config) {
         deferred.reject('There was an issue updating the books');
      });

      return deferred.promise;
   }

   return {
      reload: reload
   }
});

//Use the BookService in your controller or directive managing the model
books = BookService.reload();

Answer 4

Here are a couple of ideas to consider:

To ensure your model is structured correctly, follow the $resource documentation which states that having an empty object initially will prevent rendering until data is received from the server and then automatically update the view.

Create your own Angular Service for API interactions in order to have more control over asynchronous behavior:

yourApp.factory('BookService', function($q) {

   //Other API calls can be included here

   function reload() {
      var deferred = $q.defer();

      $http.get('/someUrl').
      success(function(data, status, headers, config) {
         //Process the data as needed...then
         deferred.resolve(data);
      }).
      error(function(data, status, headers, config) {
         deferred.reject('There was an issue updating the books');
      });

      return deferred.promise;
   }

   return {
      reload: reload
   }
});

//Use the BookService in your controller or directive managing the model
books = BookService.reload();

Answer 5

Answer №3

I had some issues with @num8er's solution as it kept crashing when I tried to run it. It made me wonder if we are using different versions of Angular (I'm currently on 1.4.x). One major change I had to make was from get() to $get(). Additionally, I wanted to reload the object without needing a custom callback every time I called reload, so I made modifications to the inner part.

To resolve this, I did the following:

var Book = $resource("/books/:id", {id: "@id"});
Book.prototype.reload = function() {
    var book = this;
    book.$get(book.id, function (new_book) {
        book = new_book;  // replace old book object with newly reloaded one
    });
};

var book = Book.get(1);
book.reload();

Answer 6

I had some issues with @num8er's solution as it kept crashing when I tried to run it. It made me wonder if we are using different versions of Angular (I'm currently on 1.4.x). One major change I had to make was from get() to $get(). Additionally, I wanted to reload the object without needing a custom callback every time I called reload, so I made modifications to the inner part.

To resolve this, I did the following:

var Book = $resource("/books/:id", {id: "@id"});
Book.prototype.reload = function() {
    var book = this;
    book.$get(book.id, function (new_book) {
        book = new_book;  // replace old book object with newly reloaded one
    });
};

var book = Book.get(1);
book.reload();

Refreshing the Angular resource under observation

Answer №1

Answer №2

Answer №3

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