Using yield to execute

gistfile1.rb

def send_task
  self.class.execute { self.prepare!; self }
end

def self.execute
  begin
    ActiveRecord::Base.connection.execute("LOCK TABLE tasks WRITE")
    tasks = [*yield]
  ensure
    ActiveRecord::Base.connection.execute("UNLOCK TABLE")
  end

  tasks.each { |task| task.submit_data }
end