Getting count of brands

Catbrand.js

categorySchema.find({})
  .exec()
  .then(categories => {
    // When you return a promise from a .then callback, the promise that gets returned from the original .then
    // resolves when the inner promise that you return resolves
    return Promise.all(categories.map(cat=> {
      return brandSchema.find({category: cat._id}).count() 
    })); 
  })
  .then(counts => {
    // so this resolves when the Promise.all above resolves
    // counts is an array of numbers. I don't know what you want to do with them.
    console.log('DONE');
  });

Okay thanks! I kinda have started to understand the concept of promises now 👍