追加项目以获取项目解析云代码

Question

• 的Javascript
• 解析云代码的阵列

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在应用的过程中User可以申请加入另一个Users帐户。这样做的伪代码如下：

1. 发上来，我们想加入
2. 搜索，看是否存在于数据库中的username帐户的username
3. 如果no回报
4. 如果yes创建一个新的AccountRequest对象
5. 将新创建的AccountRequest对象添加到我们正在搜索的用户。

我能够做到步骤1-4，但是我无法完成＃5。

这是我正在使用的代码。

Parse.Cloud.define("sendAccountAdditionRequest", function(request, response) { 

    console.log("-sendAccountAdditionRequest"); 

    // Create the query on the User class 
    var query = new Parse.Query(Parse.User); 

    // Set our parameters to search on 
    query.equalTo("username", request.params.adminUsername); 

    // Perform search 
    query.find({ 

    // We found a matching user 
    success: function(results) { 

     Parse.Cloud.useMasterKey(); 

     var fetchedUser = results[0] 

     console.log("--found user"); 
     console.log("--creating new AccountRequest"); 

     // Create a new instance of AccountRequest 
     var AccountRequestClass = Parse.Object.extend("AccountRequest"); 
     var accountRequest = new AccountRequestClass(); 

     // Set the User it is related to. Our User class has a 1..n relationship to AccountRequest 
     accountRequest.set("user", fetchedUser); 

     // Set out other values for the AccountRequest 
     accountRequest.set("phone", request.params.adminUsername); 
     accountRequest.set("dateSent", Date.now()); 

     // Save the new AccountRequest 
     accountRequest.save(null,{ 

      // Once the new AccountRequest has been saved we need to add it to our fetched User 
      success:function(savedRequest) { 

       console.log("---adding AccountRequest to fetched User"); 

       // 
       // === This is where stuff breaks 
       // 

       var requestRelation = fetchedUser.relation("accountRequest"); 

       // Now we need to add the new AccountRequest to the fetched User. The accountRequest property for a User is array...I'm not sure how I'm suppose to append a new item to that. I think I need to somehow cast results[0] to a User object? Maybe? 
       requestRelation.add(savedRequest); 

       // We perform a save on the User now that the accountRequest has been added. 
       fetchedUser.save(null, { 

        success:function(response) { 
         console.log("----AccountRequest complete"); 
         response.success("A request has been sent!"); 
        }, 

        error:function(error) { 
         // This is printing out: ParseUser { _objCount: 2, className: '_User', id: 'QjhQxWCFWs' } 
         console.log(error); 
         response.error(error); 
        } 
       }); 


       // 
       // ================================ 
       // 


       //response.success("A request has been sent!"); 
      }, 

      // There was an error saving the new AccountRequest 
      error:function(error) { 
       response.error(error); 
      } 
     }); 
    }, 

    // We were not able to find an account with the supplied username 
    error: function() { 
     response.error("An account with that number does not exist. Please tell your administrator to sign up before you are added."); 
    } 
    }); 
}); 

我相信我的问题是获取从初始查询返回的搜索结果中的accountRequest关系。另外需要注意的是，我还没有创建PFUser的accountRequest属性，我的理解是，当我执行save函数时，这将自动由Parse完成。

Answer 1

是否为您创建accountRequest取决于是否将类级别权限设置为允许客户端应用程序添加字段。对于您的Parse.User，这可能设置为NO。

但无论如何，Parse.User上的关系并不需要，因为您已经在AccountRequest类中建立了它。给定一个用户，你可以得到它的accountRequests有：

PFQuery *query = [PFQuery queryWithClassName:@"AccountRequest"]; 
[query whereKey:@"user" equalTo:aUser]; 
query.find()... 

这相当于获得的用户的关系，获得其查询并运行它。

关于你的代码的一些注意事项：（a）findOne将为你节省一条线，当你知道只有一个结果时，（b）使用Parse.Promise会真正整理一些东西。