Rails 3 -Render PDF from view and attach to email

问题:

I have been using Wicked_pdf to render a view as a PDF and actionmailer to send emails, but I can't get them to work together. I want to attach a PDF version of a certain view to an email using actionmailer and send it out by clicking a link or a button. I have a link_to command that sends out an email. Here is my controller that gets the email generated:

def sendemail
 @user = User.find(params[:id])
 Sendpdf.send_report(@user).deliver
 redirect_to user_path(@user)
 flash[:notice] = 'Email has been sent!'
end  

Here is what I have in my actionmailer:

class Sendpdf < ActionMailer::Base
default :from => "[e-mail]"

def send_report(user)
@user = user
  attachment "application/pdf" do |a|
  a.body = #Something should go here, maybe WickedPDF.new.something?
  a.filename = 'MyPDF'
end     
mail(:to => user.email, :subject => "awesome pdf, check it")
end

end

I have seen many questions and answers, most dealing with Prawn. It seems like there should be a simple answer to this. Can anyone help?

UPDATE I'm grateful for a suggestion to use as an alternative option in the answer below. However, I would really like to learn how to render a view as a PDF and attach it to my email. I am open to using something different like Prawn or anything else if I need to.

回答1:

There are 2 ways for it.

1. Either, you want the pdf to be embedded in the email you are sending, so that when the user downloads the pdf from the email, there is no request to the render new pdf action for your respective controller.
   I don't know how to do this efficiently because I have never done this before.

2. Or, you just provide a link to the pdf in your email and when the user clicks on it, now the action for creating the pdf is called, and then the user can download it.
   This way, if there is a lot of burden on the server for the downloading of the pdf's, you can redirect these requests somewhere else. In short, there is a huge scope for efficiency.

A sample code for the 2nd method(code provided was written by using PDFkit, so change accordingly):

class PdfsController < ApplicationController
  def pdf
    respond_to do |format|
      format.pdf { render :text => wickedPDF.new( Pdf.find(params[:id]).content ).to_pdf }
    end
  end
...
end

Replace the Pdf.find(params[:id]).content as per your choice, and the to_pdf method, as per wickedPDF.

Then, you can simply pass the link for the pdf download in your email like this

<%= link_to "Download", pdf_pdf_path(pdf, :format => "pdf") %>

or whatever suits as per wickedPDF.

回答2:

2 good ways to do this the way you want:

1: Create the pdf in the controller, then send that to the email as a param.

# controller
def sendemail
  @user = User.find(params[:id])
  pdf = render_to_string :pdf => 'MyPDF'
  Sendpdf.send_report(@user, pdf).deliver
  redirect_to user_path(@user)
  flash[:notice] = 'Email has been sent!'
end

# mailer
def send_report(user, pdf)
  @user = user
  attachments['MyPDF.pdf'] = pdf
  mail(:to => user.email, :subject => "awesome pdf, check it")
end

2: Create the pdf in the mailer directly (a little more involved, but can be called from a model)

def send_report(user)
  @user = user
  mail(:to => user.email, :subject => "awesome pdf, check it") do |format|
    format.text # renders send_report.text.erb for body of email
    format.pdf do
      attachments['MyPDF.pdf'] = WickedPdf.new.pdf_from_string(
        render_to_string(:pdf => 'MyPDF',:template => 'reports/show.pdf.erb')
      )
    end
  end
end

回答3:

I'm trying to do something similar as what you want to do, though it isn't working yet:

class UserMailer < ActionMailer::Base
  require "open-uri"
  include Rails.application.routes.url_helpers

  default :from => "[e-mail]"

  def new_user(user)
    @user = user
    path_to_url = url_for({ :action=>"show", :controller=>"users", :format =>"pdf", :id => @user })
    file = open(path_to_url, "r")
    attachments["user.pdf"] = file
    mail(:to => @user.email, :subject => "New user ;)")
    file.close
  end

end

Basically it tries to render the view itself (it is configured with another format) and then attached it to the email.

The only thing is that it isn't working :(