What is the best way to pass resolved promise values down to a final “then” chain [duplicate]

Answer 1

You probably doesn't need to wait until modelA is created to create modelB and so on.
If this is true, then you can do the following:

var promises = [
  ModelA.create(...),
  ModelB.create(...),
  ModelC.create(...)
);

Q.all( promises ).spread(function( modelA, modelB, modelC ) {
  // Do things with them!
}).fail(function() {
  // Oh noes :(
});

What this does is:

• Create an array of promises, with one promise for each model you need;
• Execute all 3 promises in parallel;
• Execute a function passed in spread() when all 3 promises are done. The arguments are the resolved values for each promise, in the declaration order.

I hope it helps you :)