Can I break a chain early with bluebird Promises?

Question

I don't necessarily want to error, but I have:

getFromDb().then (tradeData) ->
  if not tradeData
    # DO NOT CONTINUE THE CHAIN
  else
    getLatestPrice tradeData
.then (latestPrice) ->
  ...
.then ->
  ...
.then ->
  ...
.catch (err) ->
  next err

Any way for me to abort the chain if there is no tradeData?

Answer 1

Although an accepted answer, but I would like to tell all of googlers that, "break()" function has been changed to "cancel()"

Use Something like this:

p = getFromDb().then (tradeData) ->
  if not tradeData
    send("no data");
    p.cancel(); // Look Here!!!!!!!!!!!!!!!!
  else
    getLatestPrice tradeData
.then (latestPrice) ->
  ...
.then ->
  ...
.then ->
  ...
.catch (err) ->
  next err

Before that, make sure to add following lines in config:

Promise.config({
    cancellation: true
});