Rails 3.1.0 server crashes when trying to delete Association model

I have the following models:

association.rb:

class Association < ActiveRecord::Base
  has_and_belongs_to_many :users
  has_many :condominia, :dependent => :destroy
  accepts_nested_attributes_for :condominia, :allow_destroy => true
end

condominium.rb

class Condominium < ActiveRecord::Base
  belongs_to :association
  has_many :owners, :dependent => :destroy
  accepts_nested_attributes_for :owners, :a开发者_运维技巧llow_destroy => true
end

owner.rb

class Owner < ActiveRecord::Base
  belongs_to :condominium
  belongs_to :user
end

When I try to delete an Association model my rails server just crashes. Rails version 3.1.0 . And Ruby 1.9.2 p290 Any ideas why is this happening ?

Thanks.

UPDATE: If I try to remove the :dependent => :destroy it works. But because I need to create a batch of owners when a Condominium object is build I added:

def new_owners
    return 0
  end

  def new_owners=(int_num)
    int_num = int_num.to_i
    if int_num > 0
      int_num.times do
        self.owners.create
      end
    end
  end

The result is the same. Rails server crashing on save.

Without seeing the stack trace... beware of using names like Association.

In ActiveRecord there's already an Association class https://github.com/rails/rails/blob/master/activerecord/lib/active_record/associations/association.rb