How do you run a “do” block in a Rails Model while still listing a :dependent?

has_many :posts do
    def recent
      find(:all, :order => 'created_at desc', :limit => 12)
    end
  end

has_many :posts, :dependent => :destroy do
    def recent
      find(:all, :order => 'created_at desc', :limit => 12)
    end
  end