使用Parse.com中的云代码自动更新数据 [英] automatically updating data using cloud code in Parse.com

问题描述

我正在寻找一种使用云代码自动更新数据的方法.

I'm looking a method to automatically updating data using cloud code.

让我说一堂课Table. 在其中，我有三列:firstname，lastname和fullname.

Let say I have a class Table. inside of it, I have three column : firstname, lastname, and fullname.

当前，我仅具有firstname和lastname数据.列fullname仍然为空.

Currently, I only have firstname and lastname data only. Column fullname is still empty.

是否可以通过仅组合firstname和lastname中的值来自动填充fullname?

Is it possible to fill the fullname automatically, by just combining the value in firstname and lastname?

谢谢

推荐答案

@RoyH在创建新对象时维护您的计算列的100％权利.要进行初始迁移，请尝试使用云功能，例如:

@RoyH is 100% right to maintain your computed column as new objects are created. To do an initial migration, try a cloud function, like:

var _ = require("underscore");

Parse.Cloud.define("addFullnames", function(request, response) {
    // useMasterKey if the calling user doesn't have permissions read or write to Table
    Parse.Cloud.useMasterKey();
    var query = new Parse.Query("Table");
    // we'll call tables > 1000  an 'advanced topic'
    query.limit = 1000;
    query.find().then(function(results) {
        _.each(results, function(result) {
            var firstname = result.get("firstname") || "";
            var lastname = result.get("lastname") || "";
            result.set("fullname", (firstname + " " + lastname).trim());
        });
        return Parse.Object.saveAll(results);
    }).then(function(results) {
        response.success(results);
    }, function(error) {
        response.error(error);
    });
});

这样称呼:

curl -X POST \
  -H "X-Parse-Application-Id: your_app_id_here" \
  -H "X-Parse-REST-API-Key: your_rest_key_here" \
  -H "Content-Type: application/json" \
  https://api.parse.com/1/functions/addFullnames

您可以分解_.each()中的代码以创建在此处调用的函数，并使用beforeSave挂钩来维护添加的数据.

You can factor out the code inside _.each() to make a function that's called here and by a beforeSave hook to maintain the data as it is added.

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