Simple JsonAPi adapter for Restangular

config.js

// it require either lodash or underscorejs

.config(function(RestangularProvider) {
        // add a response interceptor
        RestangularProvider.addResponseInterceptor(function(data, operation, what, url, response, deferred) {
          extractedData = data.data;
          extractedData.meta = data.meta;
          extractedData.included = data.included;

          function _apply(elem, fct){
            if(elem !== undefined){
              if(elem.type !== undefined){
                fct(elem);
              }else{
                _.forEach(elem, function(el){
                  _apply(el, fct);
                });
              }
            }
          }

          _apply(data.data, function(elem){
            _apply(elem.relationships, function(rel){
              rel.getIncluded = function(){
                return _.find(extractedData.included, function(included){
                  a = included.type == rel.type;
                  b = included.id == rel.id;
                  return a && b;
                });
              };
            });
          });
          return extractedData;
        });

    });

usage.js

//simply call getIncluded on a relationship object and bam!
seller.relationships.user.data.getIncluded().attributes.name