Question

I have the following in my coffeescript/backbone app. The problem is it’s running console.log BEFORE the “each” function is complete (in other words, before it’s done doing create() for each collection). What I would like to know is if there is some type of success callback I can use that I’m not aware of in order to run console.log once the creates are complete. Thanks in advance!

wishlist.each (model) ->
  id = model.get('id')
  lineitems.create({product_id: id})
console.log "do this when finished!"

Answer 1

I think you are confused. The each function on Backbone.Collections is not asynchronous and it doesn’t trigger any AJAX calls. The each function actually comes from Underscore which isn’t concerned with async functionality.

The asynchronous AJAX call that fetches the data is called fetch and it does have a success/error callback:

wishlist.fetch
  success: -> console.log "success"
  error: -> console.log "error"

EDIT

OK, so you want console.log to execute after ALL creations have completed. First of all, what I said about fetch is true of create. You can add success and error callbacks.

lineitems.create {product_id: id}, 
    {success: @create_success, error: @create_error}

I would consider incrementing a count for every create and decrementing the count on every success and error callbacks. When you have finished creating AND your count reaches 0, you have processed all the creations and you can call it back.