Angular - 工厂应从第三方回调中返回值

Question

我目前正在尝试编写一个角度服务来处理第三方API。 API对象处理所有事情。您只需创建对象，在其上调用函数，然后获取有效负载。当我在调试器中单步调试服务函数时，我可以在findRole函数中看到JSON响应，但是它出错了：

TypeError: Cannot read property 'then' of undefined

有关如何使这项工作的任何想法？

模块

var angular = require('angular'),
    govtracksvc = require('./rep.service'),
    Rep = require('./Rep'),
    govtrack = require('govtrack-node');

angular.module('RepresentativeApp', [])
    .value('govtrack', govtrack)
    .factory('govtracksvc', govtracksvc)
    .controller('Rep', Rep);

module.exports = angular.module('RepresentativeApp');

控制器

module.exports = function Rep (govtracksvc) {
    var rep = this;
    rep.list = govtracksvc.findRole(rep.govtrack);
};

服务

module.exports = function govtracksvc(govtrack) {
    var rep = this;
    var data = {};
    govtrack.findRole({current: true}, function (err, res) {
        if (err) {
            console.log('err: ', err);
        }
        return res;
    }).then(function (res) {
        data = res.objects;
    });
    return data;
};

如果有人想看到数据，那么这是端点：https://www.govtrack.us/api/v2/role/?current=true

Answer 1

以下是使用回调的代码示例，看看它是否符合您的需要：
的模块

var angular = require('angular'),
govtracksvc = require('./rep.service'),
Rep = require('./Rep'),
govtrack = require('govtrack-node');

angular.module('RepresentativeApp', [])
    .value('govtrack', govtrack)
    .factory('govtracksvc', govtracksvc)
    .controller('Rep', Rep);

module.exports = angular.module('RepresentativeApp');

<强>控制器

module.exports = function Rep (govtracksvc, $scope) {
    var rep = this;
    govtracksvc.findRole(rep.govtrack, function(result){
        rep.list = result;
        if(!$scope.$$phase){
            $scope.$apply();
        }
    });
};

<强>服务

module.exports = function govtracksvc(govtrack, callback) {
var rep = this;
govtrack.findRole({current: true}, function (err, res) {
    if (err) {
        console.log('err: ', err);
        return {};
      }
    return res.objects;
    });
};