What is causing ngResource to change the saved object to something like "g {0: "O", 1: "K", ..} once it receives a response?

Question

What is causing ngResource to change the saved object to something like "g {0: "O", 1: "K", ..} once it receives a response?

In my current setup, I have a default ngResource that is defined in the following way:

var Posts = $resource('/posts/');

Once I retrieve a blog post from my nodejs server using the code below:

$scope.post = Posts.get({_id:query._id});

The user makes some modifications to the post, and then I proceed with calling:

$scope.post.$save();

Upon receiving a response code of 200 from the server, the contents of $scope.post appear as follows:

g {0: "O", 1: "K", $get: function, $save: function, $query: function, $remove: function, $delete: function}

Why does this happen? Could the letters "O" and "K" symbolize a successful operation and an HTTP response code of 200? Is there any way to modify this behavior without creating a custom save method from scratch?

javascript rest angularjs

Answer 1

Answer №1

Utilizing the Instance strategies to manipulate a resource ($get, $save, etc) will automatically refresh the instance ($scope.post) with the data received from the server in this scenario.

However, it appears that the issue at hand is more complex. Your $resource definition does not handle the ID property when calling the .get() method since it is not included in the URL configuration. As a result, the server likely responded with an array of Posts when accessing the "/posts" resource. When executing the $save() method, Angular assumed an array structure and mapped the string "OK" to create corresponding items in the $scope.post object.

To resolve this, update your code as follows:

var Posts = $resource('/posts/:_id');

Then:

$scope.post = Posts.get({_id: query._id});

Now you can invoke:

$scope.post.$save();

An important consideration is that if the server responds with "OK" in the body, the $scope.post data will be overwritten. To address this, consider the following options:

Return only the status code without any additional data from the server (e.g., 204 for RESTful APIs), indicating no update is needed on the client-side.
If an update is required on the client-side (e.g., generating a new timestamp on the server), return a status code of 200 along with the updated Post object.
If making the above adjustments is not feasible, utilize the service-level method instead of the instance method:

Posts.save({_id: query._id}, post);

Answer 2

Utilizing the Instance strategies to manipulate a resource ($get, $save, etc) will automatically refresh the instance ($scope.post) with the data received from the server in this scenario.

However, it appears that the issue at hand is more complex. Your $resource definition does not handle the ID property when calling the .get() method since it is not included in the URL configuration. As a result, the server likely responded with an array of Posts when accessing the "/posts" resource. When executing the $save() method, Angular assumed an array structure and mapped the string "OK" to create corresponding items in the $scope.post object.

To resolve this, update your code as follows:

var Posts = $resource('/posts/:_id');

Then:

$scope.post = Posts.get({_id: query._id});

Now you can invoke:

$scope.post.$save();

An important consideration is that if the server responds with "OK" in the body, the $scope.post data will be overwritten. To address this, consider the following options:

Return only the status code without any additional data from the server (e.g., 204 for RESTful APIs), indicating no update is needed on the client-side.
If an update is required on the client-side (e.g., generating a new timestamp on the server), return a status code of 200 along with the updated Post object.
If making the above adjustments is not feasible, utilize the service-level method instead of the instance method:

Posts.save({_id: query._id}, post);

What is causing ngResource to change the saved object to something like "g {0: "O", 1: "K", ..} once it receives a response?

Answer №1

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