Angular - 工廠應該從第三方回調中返回值

Question

我目前正在嘗試編寫一個角度服務來處理第三方API。 API對象處理一切。你只需創建對象，調用它的一個函數，並獲得一個有效載荷。當我通過服務功能的調試步驟，我可以看到findRole函數內部JSON響應，但隨後就出現了錯誤：

TypeError: Cannot read property 'then' of undefined 

如何使這項工作任何想法？

模塊

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); 
}; 

服務

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; 
}; 

這裏是終點，應該有人想看到的數據：https://www.govtrack.us/api/v2/role/?current=true

Answer 1

這裏是使用回調的代碼示例，看看它是否適合你的需要：
模塊

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

服務

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; 
    }); 
};