I'm having trouble getting a migration to work.
I've got an Account model with the following association:
has_one :last_verified_payment, :class_name => 'AuditEntry', :order => 'updated_at DESC', :conditions => "transaction_type LIKE '%verify' AND content LIKE '%txn_type=subscr_payment%'"
I've got another model Subscription which belongs_to :account, and has a method
def calculate_last_payment_date lvp = account.last_verified_payment ... end
When I try to use this method in a migration, it throws a NoMethod error for :last_verified_payment.
This only happens in the migration though. The migration didn't touch either the accounts nor audit_entries tables. I've even gone so far as running rake db:migrate under rdebug, and stopping just before the call to account.last_verified_payment, displaying which Account instance it's using, verifying that the NoMethod is being raised, and in a parallel console session, getting the same Account and Subscription, and invoking both the Subscription#calculate_last_payment_date, and the Account#last_verified_payment successfully.
Any ideas what's going on?