var itemsProcessed = 0;
          async.forEach(categories, function(category, cb) {

            Audit.find({
              'category_id': category._id
            }, 'created_at updated_at user_Id entreprise_id nom _id category_id', function(err, auds) {
              category.products = [];
              category.count = 0;
              if (err) res.send(err);

              category.products = auds;
              category.count = auds.length;
              itemsProcessed++;

              if (itemsProcessed == categories.length) {
                cb();
              }
            });


          }, function() {

            res.json(categories);

          });