Why aren't my before_validation methods firing if some validation is scoped?

In my model I've got a couple of methods to populate attributes of an Invoice before it is validated:

validates :account_id, :presence => true
validates :account_address, :presence => true
validates :number, :presence => true
validates :number, :uniqueness => true, :scope => :client_id

before_validation :generate_number, :associate_addresses, :on => :create

def generate_number
  self.number = self.client.invoices.count + 1
end

def associate_addresses
  self.account_address = self.accou开发者_如何学运维nt.addresses.first
end

And in the controller:

@invoice = @account.invoices.build(:client_id => @client.id)

if @invoice.save
  #it saved
end

My problem is that the associate_addresses and generate_number methods only fire if I remove the :scope => :client_id argument on the :number validation.

Why would it skip the before_validation callbacks due to this?

Working in Rails 3.0.3

Thanks! Thanks.

Don't know why it's skipping the before_validation methods, but to scope a uniqueness validation in Rails 3 you should use the following syntax:

validates :number, :presence => true, :uniqueness => { :scope => :client_id }

I guess that your syntax is making it try to add a scope validation, which doesn't exist. Probably there's a Rails bug that makes that skip the before_validation methods.