How to convert as pdf using payday gemfile in rails -

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I am using payday gem and I write coding in controller and my code 
 
 
 code> class is pdf controller & lt; ApplicationController Def Indexes feedback_to do | Format | format.html format.pdf dispatch_data invoice. Render_PDF ,: filename = & gt; "Invoice # 12.pdf" ,: type = & gt; "App / PDF" ,: Nature => "Inline" and end   
 I do not know what to do next, any thoughts   
 
 
 You forgot to initialize invoice instances.  
  Invoice = Payday :: Invoice.New (: Invoice_Number => 12) Invoice.line_imes & lt; & Lt; LineItem.new (: value = & gt; 20 ,: Qty => 5 ,: Description = & gt; "Pants") Invoice. Line_ights & lt; & Lt; LineItem.new (: value = & gt; 10 ,: Qty => 3 ,: Description = & gt; "Shirts") Invoice. Line_ights & lt; & Lt; LineItem.new (: value = & gt; 5, quantity = & gt; 200 ,: description = & gt; "salute") Invoice .render_pdf_to_file ("/ path / to_file.pdf")   
 The above code is only an example given in Paid Docs.

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