Aftersave Cloud Function for Parse可以增加另一个数据表中的值? [英] Aftersave Cloud Function for Parse that increments value in another data table?

问题描述

我在获取我的Aftersave Cloud函数来递增另一个数据表中的值时遇到了麻烦.在这方面，Parse文档有点令人困惑.

I'm having trouble getting my aftersave cloud function to increment a value in another data table. The Parse documentation is a bit confusing on this front.

我有一个名为"CandidateVotes"的表，该表为候选人"的每张选票存储一行-当保存新的选票行时，我想增加存储在名为"CategoryCandidates"的另一张表中的总选票数"，每个候选人"都有一行.

I have a table called "CandidateVotes" that stores a row for each vote on a "candidate" - and when a new vote row is saved, I would like to increment the total votes count stored in a different table called "CategoryCandidates" which has a row for each "candidate".

所以相关信息:

• 投票表称为候选投票"
• 候选人表称为"CategoryCandidates"
• CategoryCandidates表中的总投票计数"列称为投票"

这是我的解析后保存云功能:

Here's my Parse aftersave cloud function:

Parse.Cloud.afterSave("CandidateVotes", function(request) {
  query = new Parse.Query("CategoryCandidates");
  query.get(request.object.get("CategoryCandidates").objectID, {
    success: function(candidate) {
      candidate.increment("votes");
      candidate.save();
    },
    error: function(error) {
      console.error("Got an error" + error.code + " : " + error.message);
    }
  });
});

保存新的投票后，这是我在云代码日志中遇到的错误:

When a new vote is saved, this is the error that I'm getting in my cloud code logs:

E2015-09-04T15:49:23.553Z]v9 after_save triggered for CandidateVotes as master:
  Input: {"object":{"candidateID":{"__type":"Pointer","className":"CategoryCandidates","objectId":"HOBbNA690z"},"createdAt":"2015-09-04T15:49:09.216Z","objectId":"RlmvJjG04t","updatedAt":"2015-09-04T15:49:23.549Z","userID":{"__type":"Pointer","className":"_User","objectId":"7YfU2ETvb3"}}}
  Result: TypeError: Cannot read property 'objectID' of undefined
    at main.js:6:53

解析文档( https://parse.com/docs/js/guide#cloud-code-aftersave-triggers )有一个示例，但我不清楚在其数据模式中小写的"post"是指什么.我也不精通JS，所以在那里可能会出现菜鸟错误.

The Parse documentation (https://parse.com/docs/js/guide#cloud-code-aftersave-triggers) has an example, but it's unclear to me what the lowercase "post" is referring to in their data schema. I'm also not well-versed in JS so might be making a rookie mistake there.

在此先感谢您的任何建议！

Thanks in advance for any suggestions or advice!

推荐答案

调试云代码肯定有点麻烦，但是您已经快要写了.您要访问"CategoryCandidates"类指针的objectId，当前正在使用request.object.get("CategoryCandidates").objectID来完成此操作.

It can definitely be a bit of a head-scratcher to debug cloud code but you were nearly there. You want to access the objectId of the "CategoryCandidates" class pointer, which you are currently using request.object.get("CategoryCandidates").objectID to do.

问题是，当您查看日志中的afterSave输入时，指针的名称是"candidateID"，而不是"CategoryCandidates".

The problem is, when you look at the log for the input to your afterSave, the name of the pointer is "candidateID", not "CategoryCandidates".

尝试使用request.object.get("candidateID").objectID

干杯， 罗素

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