Undefined method `table_name'

Hi

I’m relative new to RoR - but I’m having a problem with some model
relationships that I thought should have worked. Hope someone can
help.

The code…

MODELS:

class Delivery < ActiveRecord::Base
belongs_to :vehicle
end

class Vehicle < ActiveRecord::Base
has_many :deliveries

def self.find_all_active
Vehicle.find(:all, :order => ‘name’, :conditions => [‘is_active
= ?’, true])
end

end

CONTROLLER:
@vehicles = Vehicle.find_all_active

VIEW:
<%= vehicle.deliveries.length %>

The error…
undefined method `table_name’ for Delivery:Class

Notes…
The problem seems to be the class method find_all_active. I tested the
equivalent calls in the console and they work fine - so why not when
the application is running?

Any comments appreciated

Thanks