ruby-on-rails - Ruby-aware completion using neocomplcache in vim

Question

Suppose I'm writing a custom validation method in a Rails model:

validate :customer_must_be_valid  

And then I'm writing this method for validation:

def cust<TAB>

And neocomplcache does not present me with the completion for customer_must_be_valid.

Basically the problem is that symbols are not treated as possible method names when doing completion. How can I fix this?

For reference, here's my vimrc.

UPDATE

When pressing Ctlx Ctlo it doesn't show, but when I press Ctlx Ctlp it does show me the completion for the method name.