RestService.js

angular.module('appName').factory('RestService', ['Restangular', '$q', function(Restangular, $q){
    var service;

    return {
        setService: function($serviceName){
            service = Restangular.all($serviceName);
        },

        create: function($data){
            var serviceDeferred = $q.defer();
            service.post($data).then(function(response){
                serviceDeferred.resolve(response);
            }, function(error){
                serviceDeferred.reject(error);
            });
            return serviceDeferred.promise;
        },

        /**
         * Delete a resource
         *
         * @param $id
         * @returns {promise}
         */
        delete: function($id){
            var serviceDeferred = $q.defer();
            service.customDELETE($id, null, {'Content-Type':'application/json'}).then(function(response){
                serviceDeferred.resolve(response);
            }, function(error){
               serviceDeferred.reject(error);
            });
            return serviceDeferred.promise;
        },

        /**
         * Fetch a resource
         *
         * @param $id
         * @returns {promise}
         */
        fetch: function($id){
            var serviceDeferred = $q.defer();
            service.get($id).then(function(response){
                serviceDeferred.resolve(response);
            }, function(error){
               serviceDeferred.reject(error);
            });
            return serviceDeferred.promise;
        },

        /**
         * Fetch all resources
         *
         * @returns {promise}
         */
        fetchAll: function(){
            var serviceDeferred = $q.defer();
            service.customGET().then(function(response){
                serviceDeferred.resolve(response);
            }, function(error){
                serviceDeferred.reject(error);
            });
            return serviceDeferred.promise;
        },

        /**
         * Update a resource
         *
         * @param $id
         * @param $data
         * @returns {promise}
         */
        update: function($id, $data){
            var serviceDeferred = $q.defer();
            service.customPUT($data, $id).then(function(response){
               serviceDeferred.resolve(response);
            }, function(error){
                serviceDeferred.reject(error);
            });
            return serviceDeferred.promise;
        },

        /**
         * Patch (partial in-place update) a resource
         *
         * @param $id
         * @param $data
         * @returns {promise}
         */
        patch: function($id, $data){
            //TODO To be implemented
        },

        /**
         * Replace a collection or members of a collection
         *
         * @param $data
         * @returns {promise}
         */
        replaceList: function($data){
            //TODO To be implemented
        },

        /**
         * Delete a collection, or members of a collection
         * @param $data
         * @returns {promise}
         */
        deleteList: function($data){
            //TODO To be implemented
        }
    }
}]);