Generating objects with Sails.js - diving into nested creations

Currently, I have a controller set up to handle an API call /task/:id/start. Within this controller method, the first step is to validate if the Task with the specified ID is valid. If it is determined to be valid, then I need to proceed by creating two other model instances: TaskSet and TaskSetEvents.

The creation process involves establishing a TaskSet, followed by setting up a TaskSetEvent. It's important to note that a TaskSetEvent requires a TaskSet to exist beforehand. The code snippet below outlines my current approach for handling these creations, although I'm open to suggestions on potential improvements:

TaskSet.create({ task: task}).exec(function(err, taskSet) {
    TaskSetEvent.create({ taskSet: taskSet, eventType: 'start'}).exec(function (err, taskSetEvent) {
        console.log("Everything created ok");
    });
});

Answer №1

Simply give this a shot:

TaskSetEvent.create({
    eventType: 'beginning',
    taskSet: {
      task: myTask
    }
  })
  .then(function (taskSetEvent) {
    console.log('it ought to be completed at this point');
  });

If you are executing this via a controller endpoint, you won't need to code anything. Just POST your nested object.

Answer №2

Your code appears to be in good shape. However, it's important to be mindful of nested functions as they can make your code difficult to understand and maintain, leading to issues like spaghetti code or callback hell.

In JavaScript, common solutions to the callback problem include using promises or tools such as async.js.

For the code snippet you provided, utilizing async.waterfall() is the recommended approach. Here's how you can rewrite it:

async.waterfall([
    function(cb) {
        TaskSet.create({ task: task}).exec(cb);
    },
    function(err, taskSet, cb) {
        TaskSetEvent.create({ taskSet: taskSet, eventType: 'start'}).exec(cb);
    }
], function(err, taskSetEvent) {
    console.log('Everything created successfully');
});

The waterfall method executes a series of functions, passing the results from one to the next.

It's also worth noting that if you plan on using async frequently, you can simply install it via npm and set async: true in your globals config, eliminating the need to require it in every module.

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