Angular + Laravel POST Updating

ApiController.php

<?php

/*
|--------------------------------------------------------------------------
| Api Controller
|--------------------------------------------------------------------------
|
| This controller handles the dynamic Api request construction from an
| AJAX only request (determined by the X-Requested-With header). The
| request uses the standard Api Facade, but requires a JSON payload in
| the POST request to build the query.
|
*/

class ApiController extends BaseController {

	/**
	* Time items are stored in the cache until they're removed
	* @var int Minutes
	*/

	private static $cacheTime = 5;

	/**
	* Decodes a given JSON object into a forced array
	* @var array
	*/

	private function parseObject( $obj )
	{

		return (array) json_decode($obj, true);

	}

	private function createKey($method, $path, $data) {

		return substr(sha1($method . ':' . $path . ':' . $data), 0, 30);

	}

	/**
	* Builds the Api query from the JSON payload.
	* AJAX request only.
	* @request POST
	* @var json | HTTP 404
	*/

	public function buildQuery()
	{

		if(Request::ajax()) {

			$method = Input::get('method');

			$path = Input::get('path');

			$data = $this->parseObject(Input::get('data'));

			$cacheKey = $this->createKey($method, $path, Input::get('data'));

			if(Cache::has($cacheKey)) {

				return Crypt::decrypt(Cache::get($cacheKey));

			}
			else {

				$query = Api::$method($path, $data);

				Cache::put($cacheKey, Crypt::encrypt($query), self::$cacheTime);

				return $query;

			}

		}

		App::abort(404);

	}

}

controllers.js

app.controller('CategoryCtrl', function($scope, Api) {

	$scope.loading = true;

	Api.query('get', 'categories')
		.success(function(response) {
			$scope.categories = response;
			$scope.loading = false;
		});

});

routes.php

Route::post('api', 'ApiController@buildQuery');

services.js

/**
 * Api Service
 * 
 */

app.factory('Api', function($http) {
	
	return {
		query : function( method, path, data ) {

			if(data === undefined)
				var data = null;
			else
				var data = "'" + data + "'";

			return $http({
				method: 'POST',
				url: 'api',
				headers: { 'Content-Type' : 'application/json', 'X-Requested-With' : 'XMLHttpRequest' },
				data: { 'method': method, 'path': path, 'data': data },
			});
		},
	}

});