javascript - 解析预定的后台作业

Question

我正在尝试制作一个具有每日报价逻辑并显示报价的应用程序。它应该在我的解析类中选择随机对象并将其显示给用户。如果用户看到了今天的对象，他们应该无法在同一天看到不同的随机对象。

我用 Swift 编写了这个算法。但我认为Cloud Code和Background Job是执行此算法的更清晰和正确的方法。我研究了后台作业教程指南等来做到这一点，但我做不到，因为我没有足够的 JavaScript 知识来做到这一点。无论我在我的解析服务器中创建什么后台作业，就像这样；

    Parse.Cloud.define('todaysMentor', async (request) => {
  var Mentor = Parse.Object.extend('Mentor');
  var countQuery = new Parse.Query(Mentor);
  const count = await countQuery.count();
  const query = new Parse.Query('Mentor');
  const randomInt = Math.floor(Math.random() *  count);
  query.equalTo('position', randomInt);
  query.limit(1); // limit to at most 10 results
  const results = await query.find();

  const Today = Parse.Object.extend('Today');
  const today = new Today();
  today.set('mentor', results[0]);
  today.save()
  .then((today) => {
  // Execute any logic that should take place after the object is saved.
}, (error) => {
});
  return results;
});

Parse.Cloud.job('pickTodaysMentor', async function(request) {
  const { params, headers, log, message } = request;
  Parse.Cloud.run('todaysMentor', (request) => {
      if (!passesValidation(request.object)) {
      throw 'Ooops something went wrong'; 
    }
  });
});

我想从我的 Mentor 类中获取随机 Mentor 对象并将其添加到 Today 类中。通过这种方式，我可以在我的移动应用程序中获取 Today 对象。当我使用 Swift 调用第一个函数时，它运行良好。

我的服务器日志是这样的；

May 13, 2019, 22:22:45 +03:00- ERROR
(node:41) UnhandledPromiseRejectionWarning: TypeError: Parse.Cloud.run is not a function
    at Parse.Cloud.job (/opt/app-root/src/repo/cloud/functions.js:28:19)
    at Object.agenda.define [as fn] (/opt/app-root/src/build/agenda/agenda.js:74:25)
    at process._tickCallback (internal/process/next_tick.js:68:7)
May 13, 2019, 22:22:45 +03:00- ERROR
(node:41) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 4)

我用 google 搜索了这个错误，并了解到这是 Parse 3.0 的语法错误，他们更改了一些函数语法。 我该如何解决这个问题？或您对制定此算法有什么建议吗？

谢谢!

Answer 1

我建议你选择这样的东西:

async function todaysMentor() {
  var Mentor = Parse.Object.extend('Mentor');
  var countQuery = new Parse.Query(Mentor);
  const count = await countQuery.count();
  const query = new Parse.Query('Mentor');
  const randomInt = Math.floor(Math.random() * count);
  query.equalTo('position', randomInt);
  query.limit(1); // limit to at most 10 results
  const results = await query.find();

  const Today = Parse.Object.extend('Today');
  const today = new Today();
  today.set('mentor', results[0]);
  await today.save();
  return results;
}

Parse.Cloud.define('todaysMentor', async (request) => {
  return await todaysMentor();
});

Parse.Cloud.job('pickTodaysMentor', async function(request) {
  return await todaysMentor();
});