错误返回Promise，获取错误，因为.then不是Angular JS的函数

Question

我得到的错误为modifyProduct.then is not a function，我读过一些文章，它说因为我没有返回任何承诺，我怎么能做到这一点，有人可以帮助我

在这里，我呼吁modifyProduct内executionFromCompany功能，然后我使用executionFromCompany控制器

var app = angular.module('myApp', ["chart.js"]); 
app.factory('ProductsService', function($http) { 
    function getProduct() { 
     return $http.get('finalmsodetails.json').then(function(response) { 
      //console.log(response.data); 
      return response.data; 
     }); 
    } 

    function modifyProduct() { 
     return getProduct().then(function(rawData) { 
      newtest = rawData; 
      //console.log('test', newtest.length); 
      var lightData = rawData.map(function(item) { 
       // use Object.assign to prevent mutating original object 
       var newItem = Object.assign({}, item); 
       var lightExecutions = item.executions.map(function(d) { 
        var ld = { 
         id: d.id, 
         orderId: d.orderId, 
         executionStatus: d.executionStatus, 
         executedOn: d.executedOn, 
         executedBy: d.executedBy, 
         executedByDisplay: d.executedByDisplay, 
        }; 
        return ld; 
       }); 
       newItem.executions = lightExecutions; 
       return newItem; 
      }); 
      return lightData; 
     }); 
    } 

    function executionFromCompany() { 
     return modifyProduct.then(function(lightData) { 
      executionByCompany = $filter('filter')(lightData.executions, function(inputs) { 
       if ((inputs.executedBy == 'a')) return inputs; 
      }); 
      console.log(executionByCompany); 
      return executionByCompany; 
     }); 
    } 
    return { 
     getProduct: getProduct, 
     modifyProduct: modifyProduct, 
     executionFromCompany: executionFromCompany 
    }; 
}); 
app.controller('MainCtrl', function($scope, ProductsService) { 
    ProductsService.executionFromCompany().then(function(value) { 
     console.log(value); 
    }, function(err) { 
     // Here will be if there was an error 
    }) 
}); 

Answer 1

modifyProduct里面是一个函数，而不是一个对象

变化这

modifyProduct.then 

此

modifyProduct().then