Invalidate $resource Cache After Post Request

Question

I am using $resource and caching the results of get requests. My problem is that, after post requests, the cache is not being invalidated.

Here is the return value from the service:

return $resource('http://url.com/api/url/:id', {}, {
'query' : {
      method : 'GET',
      isArray:true,
      cache : true
    },
'get' : {
  method : 'GET',
  cache : false
}  
})

Here is the save method I am using inside my controller. As you can see, I'm using the callback on the post request to recalculate the query/list of nouns.

var newNoun = new Noun($scope.noun);
newNoun.$save(function(x) {
  $scope.nouns = Noun.query();
});

I would like to invalidate the cache after calling post or another non-get method. How could I do this? Is this already built into $resource or do I need to implement it on my own?

Answer 1

You could create a wrapper service to do the caching like you want, for example:

app.factory('cachedResource', function ($resource, $cacheFactory) {
  var cache = $cacheFactory('resourceCache');

  var interceptor = {
    response: function (response) {
      cache.remove(response.config.url);
      console.log('cache removed', response.config.url);
      return response;
    }
  };

  return function (url, paramDefaults, actions, options) {
    actions = angular.extend({}, actions, {
      'get':    { method: 'GET', cache: cache },
      'query':  { method: 'GET', cache: cache, isArray: true },
      'save':   { method: 'POST', interceptor: interceptor },
      'remove': { method: 'DELETE', interceptor: interceptor },
      'delete': { method: 'DELETE', interceptor: interceptor },
    });

    return $resource(url, paramDefaults, actions, options);
  };
});

Then replace any $resource with cachedResource.

Example plunker: http://plnkr.co/edit/lIQw4uogcoMpcuHTWy2U?p=preview