Having trouble removing objects in angular.js?

I have developed an API to be used with Angular.js:

angular.module('api', ['ngResource'])
    .factory('Server', function ($resource) {
        return $resource('http://localhost\\:3000/api/servers/:name');
    })
    .factory('ActiveServer', function ($resource) {
        return $resource('http://localhost\\:3000/api/servers/active/:name', {},
            { start: {method: 'POST'}, stop: {method: 'DELETE'} });
    });

The concept is that there is a defined set of servers accessible through the /api/servers/ endpoint. A specific server can be started by adding it to the /api/servers/active/ endpoint, and stopped by deleting it.

In my controller, I am using the following code:

$scope.start = function() {
    ActiveServer.start(this.server);
};

$scope.stop = function() {
    ActiveServer.stop(this.server);
};

This functionality is triggered by buttons:

    <div class="well span4" ng-repeat="server in servers">
        <h1>{{server.definition.name}}</h1>
        <span class="label label-info">{{server.status}}</span>
        <button type="button" class="btn btn-primary"
                ng-click="start()">Start</button>
        <button type="button" class="btn btn-primary"
                ng-click="stop()">Stop</button>
    </div>

Starting the server works fine, but I encounter issues when trying to stop it. The code provided results in the following request being sent:

Request URL:http://localhost:3000/api/servers/active?$$hashKey=005&_events=[object+Object]&definition=[object+Object]&status=ready
Request Method:DELETE

The definition part of the server object, which contains the identifier for stopping the server, isn't serialized correctly.

How can this issue be resolved?

Answer №1

For your API (known as ActiveServer), if all it requires is the server's name to function, then ensure you only pass the server's name when making a service call. Simplify the process by following this method:

$scope.start = function() {
    ActiveServer.start({name: this.server.definition.name});
};

$scope.stop = function() {
    ActiveServer.stop({name: this.server.definition.name});
};

Attempting to pass the entire this.server object in any service call will result in the entire object being parameterized into the HTTP request.

A more detailed explanation:

When utilizing something like api/servers/:name in your $resource URL, essentially what you are doing is indicating that the :name section will be substituted with the value of a property with the same name (in this instance, 'name') received within the parameters (i.e. {name: 'someName'}).

Referencing the angularJS $resource documentation:

Every key-value pair in the parameter object is initially linked to the URL template if present and then any additional keys are concatenated to the URL search query after the ?. For example, having a template /path/:verb and parameter {verb:'greet', salutation:'Hello'} results in URL /path/greet?salutation=Hello. When the parameter value has a prefix of @, the value of that parameter is extracted from the data object (useful for non-GET operations).

Hence, with a call like service.get({name: 'abc'}), the URL requested will translate to api/server/abc

Alternatively, with a call such as

service.get({name: 'abc', id: '123'})
, the URL generated will be api/server/abc?id=123

In the scenario presented, the this.server Object may resemble the following:

{ 
  $$hashKey: 005,
  _events: {},
  definition: {},
  status: ready
}

As AngularJS does not conduct deep parametrization, _events and definition could appear as

_events=[object+Object]&definition=[object+Object]
within the URL.

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