this.saveProductCategory = function() {
        var productCategory = {
            name: $scope.productCategory
        };
        var promise = ProductCategory.saveProductCategory(productCategory)
        .then(function(data) {
            $scope.vendorProductData.product_category_id = data.id;
        })
        .catch(function(data) {
            $scope.message = data;
        });

        return promise;
    };

    this.saveVendorProduct = function() {

        var functionsToExecute = [];

        if(!$scope.vendorProductData.product_name_id) {
            functionsToExecute.push(this.saveProductName());
        }

        if(!$scope.vendorProductData.product_type_id) {
            functionsToExecute.push(this.saveProductType());
        }

        if(!$scope.vendorProductData.product_category_id) {
            functionsToExecute.push(this.saveProductCategory());
        }

        $q.all(functionsToExecute)
        .then(
            VendorProduct.saveVendorProduct($scope.vendorProductData)
            .then(function(data) {
                $state.go('products');
            })
            .catch(function(data) {
                $scope.message = data;
            })
        );
    };