$ q.all中的角度承诺不会被拒绝

时间:2014-05-21 00:17:24

标签: javascript angularjs promise

背景

我有一个看起来像(Manufacturer -> Vehicle Type -> Vehicle Model -> Vehicle Submodel)的实体层次结构。每个制造商都有多种车型,每种车型都有多种型号,每种车型都有多个子模型。

我需要检索给定制造商和类型的车辆模型列表,然后针对每个模型检索其所有子模型(getSubmodels)。一旦他们全部被取出,我将它们放入JSON对象中。我试图使用Angular的$q模块来确保在继续执行之前已经检索到所有子模型 - 我需要在我继续前进并渲染之前解决所有的承诺。页面组件。

问题:

快乐' path工作正常,但是如果其中一个子模型请求有错误,那么来自子模型函数的被拒绝的promise不会被$q.all().then块捕获,因此整个getVehicleHierarchy promise不会被拒绝。

angular.module('uiApp.services.hierarchy', ['restangular'])
    .service('VehicleHierarchy', function VehicleHierarchy($http, $q, Restangular) {
        this.getVehicleHierarchy = function (manufacturerId, vehicleTypeId, vehicleModelId) {
            var that = this;
            var deferred = $q.defer();
            var promise = deferred.promise;
            var promises = [];
            Restangular.configuration.baseUrl = urlBuilder.buildHierarchyServiceUrl() + '/vehicle-hierarchy';
            Restangular.one('manufacturer', manufacturerId).one('type', vehicleTypeId).one('class', vehicleClassId).customGET('models')
                .then(function (models) {
                    var result = {};
                    _.forEach(models.result, function (model) {
                        result[parseInt(model.id)] = model;
                    });
                    _.forEach(result, function (model) {
                        promises.push(that.getSubmodels(manufacturerId, vehicleTypeId, vehicleClassId, model.id));
                    });
                    $q.all(promises).then(function (results) {
                        var i = 0;
                        _.forEach(result, function (model) {
                            result[parseInt(model.id)].subModels = results[i++];
                        }, function (errors) {
                            deferred.reject(errorResponse);
                        });
                        deferred.resolve(result);
                    });
                }, function(error) {
                    deferred.reject('error!');
                });
            return promise;
        };

        this.getSubmodels = function (manufacturerId, vehicleTypeId, vehicleClassId, modelId) {
            var submodels = {};
            var deferred = $q.defer();
            Restangular.configuration.baseUrl = urlBuilder.buildHierarchyServiceUrl() + '/vehicle-hierarchy';
            Restangular.one('manufacturer', brandId).one('type', vehicleTypeId).one('class', vehicleClassId).one('model', modelId)
                .customGET('submodels').then(function (submodelResponse) {
                    _.forEach(subclassResponse.result, function (subModel) {
                        subclasses[parseInt(subModel.id)] = subModel;
                    });
                    deferred.resolve(subclasses);
                }, function (error) {
                    deferred.reject('error'!);
                });
            return deferred.promise;
        };
    });
});

1 个答案:

答案 0 :(得分:1)

您需要在$q.all中为您的错误函数返回then调用才能捕获它:

return $q.all(promises).then(function (results) {