解析云代码检查密钥重复

Question

我使用 Parse 开发了一个 iOS 应用程序。当用户注册时，我想检查他的 phone 号码是否存在。所以我写了下面的 Parse Cloud 代码：

Parse.Cloud.beforeSave(Parse.User, function(request, response) {
    var toSaveObjectId = request.object.get("objectId");
    console.log("UserName: ");
    console.log(request.object.get('username'));
    //if (typeof obj.foo != 'undefined')
    if (typeof toSaveObjectId != 'undefined') { //If toSavedObjectId is defined, then it will be an update. 
        console.log(toSaveObjectId);
        response.success(); //Just allow update to perform. Sadly, we never access here.

    }
    else { //If not an update, meaning an insertion
        var phoneNumer = request.object.get("additional"); //I use ParseUI so they use "additional" field for phone number. There is no problem with it.

        //Now check duplication
        var query = new Parse.Query(Parse.User);
        query.equalTo("additional", phoneNumer);
        query.count({ // If found 2 when signing up:Still do not allow. If found 2 when updating: Still allow.
            success: function(count) {
                if (count > 0) { //Found duplication
                //Duplication while signing up. Do not allow
                    response.error("Duplicated phone number") ;
                }
                else { //Object to sign up is equal to object found. Meaning updating. Allow updating
                    response.success();
                }
            },
            error: function() {
              response.error("Some error when checking user phone number before saving");
            }       
        });
    }
});

这个方法是在我注册的时候执行的，如果我选择一个不存在的phone号码，我可以注册。但是此时用户不能有任何更新。我怀疑每次执行更新时都会调用 beforeSave，并且它总是 returns 错误 "Duplicated phone number".

我确实尝试通过检查

来避免这种情况

var toSaveObjectId = request.object.get("objectId");

如果未定义toSaveObjectId，那么它将是一个更新。所以我们应该return成功。但是，代码仍然无法正常工作，我仍然得到 "Duplicated phone number"。所以问题出在条件上：

if (typeof toSaveObjectId != 'undefined')

我的问题是：

1) 如何解决这个问题？

现在我的日志开始工作了。我看到这个：

E2015-05-01T12:28:01.817Z]v21 before_save triggered for _User for user 1oDlr2aqi6:   

Input: {"original":{"additional":"+84913037492","createdAt":"2015-05-01T12:16:20.838Z","email":"daominht@gmail.com","objectId":"1oDlr2aqi6","sessionToken":"r:RJVZ5hlp7z5gRBtnuydWkuCA1","updatedAt":"2015-05-01T12:16:20.838Z","username":"abfadsfsd"},"update":{"point":220,"promoCode":"1oDlr2aqi6576","usedPromoCode":"7UjadcDdAi43"}} 

Result: Duplicated phone number 

I2015-05-01T12:28:01.848Z]UserName:  

I2015-05-01T12:28:01.849Z]abfadsfsd

在https://parse.com/apps/(project-name)/cloud_code/log

编辑：我将 "if (typeof toSaveObjectId != 'undefined')" 更改为

if (toSaveObjectId != null)

但也不行。我只是尝试 console.log() 一些 request.object.get('column name')。奇怪的是，只有 console.log(request.object.get("username")) 才能正常工作。如果我想打印 request.object 的其他列，我将始终在云代码中得到此日志："No Message provided"。

Answer 1

最后这是我的工作代码：

Parse.Cloud.beforeSave(Parse.User, function(request, response) {
    //console.log(request.object.isNew()); //You could also use this. request.object.isNew() return yes if the request try to insert new record rather than updating.

    if (request.object.id != null) { //If toSavedObjectId is defined, then it will be an update
        response.success(); //Just allow update to perform

    }
    else { //If not an update, meaning an insertion
        var phoneNumber = request.object.get("additional");
        if (phoneNumber == null || typeof phoneNumber == 'undefined') { //phoneNumber == null or undefined mean not signing up with phoneNumber. So let it sign up.
            response.success();
        }
        else {
            //Now check duplication
            var query = new Parse.Query(Parse.User);
            query.equalTo("additional", phoneNumber);
            query.count({ // If found 2 when signing up:Still do not allow. If found 2 when updating: Still allow.
                success: function(count) {
                    if (count > 0) { //Found duplication
                    //Duplication while signing up. Do not allow
                        response.error("Duplicated phone number") ;
                    }
                    else { //Object to sign up is equal to object found. Meaning updating. Allow updating
                        response.success();
                    }
                },
                error: function() {
                  response.error("Some error when checking user phone number before saving");
                }       
            });
        }

    }
});

一些外卖不是：

1) 对于request.object的某些属性，不要使用.get("key")。例如：对于 objectId，不要使用 .get("objectId")。请改用 request.object.id。

2) 如果你 console.log() 一些对象，例如 console.log(request.object) 你可能会在记录一个新创建的对象时得到 "Uncaught Tried to save an object with a pointer to a new, unsaved object."”。有人请详细解释一下？

3) 如果您尝试对某些 null/undefined 变量执行 console.log()，下一行代码将不会执行。所以你可能会得到 "No return success/error".

4) 您可以使用 request.object.isNew() 作为另一种方法来检查此请求是否尝试创建新对象（return 是）或尝试更新现有对象（return没有）。

解析云代码检查密钥重复

Parse cloud code check for key duplication

cloud

parse-platform