如何在Restularular中模擬AngularJS中的一對一關係

Question

我有一個companies集合，其中country_id字段指的是_id中的countries集合。

Companies如下：

{ 
    name: "acme", 
    address: "zossener straße 123", 
    postalCode: "10961", 
    city: "berlin", 
    country_id: "56d58d68ab68b5cf3f72788e" 
} 

Countries如下：

{ 
    _id: "56d58d68ab68b5cf3f72788e", 
    name: "Germany" 
} 

我想要做的，是取代的Companies的country_id到Countries.name。因此，對於每個公司我想要國家名稱，而不是國家/地區ID。我正在使用Restangular。我的控制器：

// creates a Restangular object of the 'companies' endpoint for later use 
var Companies = Restangular.all('companies'); 

// for later pushing the countries 
$scope.allCompanies = []; 

// queries companies collection 
Companies.getList().then(function(companies) { 
    $scope.companies = companies; 

    // iterates each company to get the country name 
    for (var i = 0; i < $scope.companies.length; i++) { 
    // prepares temp object to be pushed to $scope.allCompanies 
    var buffer = { 
     name: $scope.companies[i].name, 
     address: $scope.companies[i].address, 
     postalCode: $scope.companies[i].postalCode, 
     city: $scope.companies[i].city, 
     countryId: $scope.companies[i].country_id 
    }; 

    // queries countries collection passing country_id 
    var Country = Restangular.one('countries', $scope.companies[i].country_id); 

    Country.get().then(function(country) { 
     // sets country name for temp object based on country_id 
     buffer.country = country.name; 

     // pushes buffer to $scope.allCompanies 
     $scope.allCompanies.push(buffer); 
    }); 
    }; 

運行時，$scope.allCompanies顯示了只有一個國家，這是分配給buffer最後一個國家的所有公司。我認爲承諾有問題，但不確定。任何幫助？提前致謝。

Answer 1

您可以將檢索國家的邏輯封裝在函數中。這樣，該功能可以保持buffer的正確參考值，而不會受到i變化的影響：

// creates a Restangular object of the 'companies' endpoint for later use 
var Companies = Restangular.all('companies'); 

// for later pushing the countries 
$scope.allCompanies = []; 

// queries companies collection 
Companies.getList().then(function(companies) { 
    $scope.companies = companies; 
    function setCountryName(buffer){ 

    // queries countries collection passing country_id 
    var Country = Restangular.one('countries', buffer.countryId); 

    Country.get().then(function(country) { 
     // sets country name for temp object based on country_id 
     buffer.country = country.name; 
    }); 
    return buffer; 
    } 

    // iterates each company to get the country name 
    for (var i = 0; i < $scope.companies.length; i++) { 
    // prepares temp object to be pushed to $scope.allCompanies 
    var buffer = { 
     name: $scope.companies[i].name, 
     address: $scope.companies[i].address, 
     postalCode: $scope.companies[i].postalCode, 
     city: $scope.companies[i].city, 
     countryId: $scope.companies[i].country_id 
    }; 

     // pushes buffer to $scope.allCompanies 
     $scope.allCompanies.push(setCountryName(buffer)); 
    };