For this specific case, supposing your API returns a key *etag* along with
the object you could define your service like this:
return $resource('/example/:id', {id: '@id'}, {
update: {
method: 'PUT',
headers: {
'If-Match': function(config) {
return config.data.etag;
}
}
}
});
This works for *PUT* and *PATCH* methods. If you also need it to work for
*DELETE*, checkout this fork: https://github.com/eduardomb/ng-resource-etag
On Thursday, July 11, 2013 at 4:36:35 PM UTC-3, javier hector wrote:
>
> Hi, All , I'm new to Angular and I want to know how to retrieve response
> headers and based on these values set request headers.
>
> A use case for this should be set Conditional GET requests or Conditional
> PUT requests in a REST service.
>
>
> For example
>
> var MyApp = angular.module ('MyApp',['ngResource']);
>
> MyApp.config(function($routeProvider, $locationProvider,$httpProvider) {
> $routeProvider
> .when('/', {controller: ListCtrl, templateUrl: '/partials/list.html'})
> .when('/edit/:id', {controller: EditCtrl, templateUrl:
> '/partials/details.html'})
> .when('/new', {controller: CreateCtrl, templateUrl:
> '/partials/details.html'})
> .otherwise({redirectTo: '/'});
> $locationProvider.html5Mode(true);
> });
>
> MyApp.factory('MyAppService', function($resource) {
> return $resource('/example/:id', {id: '@id'}, {update: {method: 'PUT'}});
> });
>
>
> function EditCtrl ($scope, $location, $routeParams,MyAppService) {
>
> $scope.get = MyAppService.get({id: $routeParams.id},
> function(data,headers) {
> $scope.example = data.content;
> $scope.ifmatch = headers().etag;
> });
>
>
> $scope.action = 'Update';
> $scope.save = function() {
> MyAppService.update({id: $routeParams.id},,$scope.example, function() {
> $location.path('/');
> })
> }
> };
>
> So suppose I want in the the EditCtrl set the if-match request header
> using the etag value sent from the server, if any.
> I tried to do send the {headers :{'if-match' : $scope.ifmatch}} as part
> of update call but it does not work.
> MyAppService.update({id: $routeParams.id}, {headers :{'if-match' :
> $scope.ifmatch}} ,$scope.example, function() {
> What do you suggest to do in this scenario?
>
> Thanks
> /Javier
>
>
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