Question

Hi i have create a PDF conversion in my rails application using Prawn and it working fine.
Now i am sending that PDf in an email attachment. Now problem is that i can send PDF attachment if i do not use any helper method, but when i use my format_currency method in PDf file it gives error on instance_eval method. here is my code sample:
format currency code:

module ApplicationHelper

def format_currency(amt)
    unit = 'INR'
    country = current_company.country
    if !country.blank? && !country.currency_unicode.blank?
      unit = country.currency_unicode.to_s
    elsif !country.blank? 
      unit = country.currency_code.to_s
    end
    number_to_currency(amt, :unit => unit+" ", :precision=> 2)   
  end 
end 

My controller code :

pdf.instance_eval do
      @company = current_company
      @invoice = invoice
      @invoice_line_items = invoice_line_items
      @receipt_vouchers = receipt_vouchers
      eval(template) #this evaluates the template with your variables
    end

the error message i got :

undefined method `format_currency' for #<Prawn::Document:0x7f89601c2b68>

with this code i can send attachment successfuly if i don’t use helper method but i need to use that method.

Answer 1

I have fixed this issue in a different manner, i have created a new currency_code method in my company model and called that in my format_currency helper method and it is working for me fine:
Here is what i have done :

def currency_code
  unit = 'INR'
  if !country.blank? && !country.currency_unicode.blank?
      unit = country.currency_unicode.to_s
  elsif !country.blank? 
      unit = country.currency_code.to_s
  end
   unit
end

and used it in my format_currency helper :

def format_currency(amt)
    unit = current_company.currency_code
    number_to_currency(amt, :unit => unit+" ", :precision=> 2)   
  end 

and in my controller i have added a variable for currency and used it in my pdf file:

 pdf.instance_eval do
      @company = current_company
      @invoice = invoice
      @invoice_line_items = invoice_line_items
      @receipt_vouchers = receipt_vouchers
      @currency = current_company.currency_code # new added variable for currency
      eval(template) #this evaluates the template with your variables
    end