Question

In my Rails application, I’m trying to attach the invoice to the email:

def invoice(invoice)
  attachment :content_disposition => "attachment",
             :body => InvoicePdf.new(invoice),
             :content_type => "application/pdf",
             :filename => 'invoice.pdf'

  mail(:to => @user.email, :subject => "Your Invoice")
end

The InvoicePdf is a Prawn PDF document:

class InvoicePdf < Prawn::Document
  def initialize(order, view)
    draw_pdf
  end

  def draw_pdf
    # pdf stuff
  end
end

I get no attachments in the email. What am I doing wrong? Any tips would be welcomed and appreciated.

Edit: The Rails version I’m using is 3.0.x

Answer 1

Take a look at the Action Mailer Guide. You need to call the attachments method for you to add an attachment.

Try this:

attachments['attachment_filename'] = InvoicePdf.new(invoice)

This is assuming that calling InvoicePdf.new(invoice) generates a file and returns an IO object representing that file. I also noticed that your InvoicePdf class initializer expects two parameters but you are passing only one.

Update:
Also note that Action Mailer will take the file name and work out the mime type, set the Content-Type, Content-Disposition, Content-Transfer-Encoding and base64 encode the contents of the attachment all for you so setting it manually isn’t necessary unless you want to override the defaults.

Based on your pdf generation method, this will probably be better:

invoice = InvoicePdf.new(invoice)
attachments["invoice.pdf"] = { :mime_type => 'application/pdf', :content => invoice.render }
mail(:to => @user.email, :subject => "Your Invoice")