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