Using mongoose promises with async/await

In order to make orderEmployees behave like async functions, you have to return the resulting promise. There are two rules to follow when using promises without async/await keywords:

1. A function is asynchronous if it returns a Promise
2. If you have a promise (for example returned by an async function) you must either call .then on it or return it.

When you are using async/await then you must await on promises you obtain.

This said you will notice that you do not return the promise generated inside orderEmployees. Easy to fix, but its also easy to rewrite that function to async too.

orderEmployees: (companyID) => {
  return User.find({company:companyID}) // Notice the return here
  .exec()
  .then((employees) => {
    // FIRST CONSOLE.LOG
    console.log(employees);
    return employees;
  })
  .catch((err) => {
    return 'error occured';
  });
},

or

orderEmployees: async(companyID) => {
  try {
    const employees = await User.find({company:companyID}).exec();
    console.log(employees);
    return employees;
  } catch (err) {
    return 'error occured';
  }
},

PS: the error handling is somewhat flawed here. We usually do not handle errors by returning an error string from a function. It is better to have the error propagate in this case, and handle it from some top-level, UI code.