create action for sending a notification

gistfile1.rb

def create
  if the_customer_is_missing
    @notification.errors[:base] << "Please choose a customer or add a new one."
    render :index
  elsif a_new_customer_is_being_added 
    if @customer.valid?
      send_text_if_notification_and_customer_valid!
    else
      @notification.errors.clear
      render :index
    end
  elsif sending_to_an_existing_customer
    if @notification.valid?
      handle_sending_text_message(notification: @notification)
    else
      render :index 
    end
  else
    flash[:error] = "There was a problem. The notification could not be sent."
    render :index
  end
end