Question

I have a custom controller action as listed below. I have a form with checkboxes that allow me to print the selected items by writing them to a pdf file using Prawn. Any Ideas?

I’m getting the following error.

AbstractController::DoubleRenderError (Render and/or redirect were called multiple
times in this action. Please note that you may only call render OR redirect, and
at most once per action.

Here is the relevant part of the controller

class ShipmentsController < ApplicationController
  autocomplete :client, :name, :full => true
  autocomplete :product, :product_name, :full => true, :extra_data => [:product_code, :miller_product_code]

  respond_to :js, :html
def index
  if params[:status]
    @openshipments = Shipment.where(:status => params[:status]).search(params[:search1]).order(sort_column + " " + sort_direction).page(params[:page])
  else
    @shipments = Shipment.search(params[:search]).order(sort_column + " " + sort_direction).page(params[:page])
  end
end
def create
  ...
end
def edit
  ... 
end
def update
  ... 
end
def destroy
  ...
end

def print_open
  @printshipments = Shipment.find(params[:open_shipment_ids])

  respond_to do |format|
    format.pdf do
      @printshipments.each do |shipment|
        pdf = Prawn::Document.new
        pdf.text "bill_of_lading_#{shipment.bill_of_lading}"
       #removed send_data pdf.render, filename: "bill_of_lading_#{shipment.bill_of_lading}"
        File.open("public/bill_of_ladings/bill_of_lading_#{shipment.bill_of_lading}.pdf", "wb") { |f| f << pdf.render }
        shipment.update_attribute(:status, "PRINTED")

      end
    end
  end
  redirect_to shipments_path
end

EDIT:
I can get rid of the error by removing the send_data line, however I can’t get the form to redirect to the page I want. It only wants to render the javacript in the directory, possibly because this is a remote form. I am calling the print_open through a form_tag that uses the following route.

  get '/shipments/status/:status' => 'shipments#index'

When I use the redirect_to shipments_path at the end of my print_open method, It renders the view, but the url in the browser still reads as:

http://localhost:3000/shipments/status/open

instead of:

http://localhost:3000/shipments

Answer 1

Since you’re looping over an array and calling send_data on each element, it’s possible you’re calling send_data more than once. That would give you the exception that you’re receiving.