I'm having the same problem. I've done a little digging and I think
the problem is within Ambition::API#size, but I can't remember as I've
since patched my local copy of ambition.
I'm also having problems with record.association.count, where
association is a has_many - I'm getting a 'wrong number of arguments'
on that. That may well not be an ambition problem, but I thought it
was worth mentioning all the same.
Cheers
Ben