Track HTTP Referrer on form submits

Track referrer

You can easily add referrer tracking to your form submits so you know where users came from prior to submitting your form.

In your application controller:

class ApplicationController < ActionController::Base
  # Prevent CSRF attacks by raising an exception.
  # For APIs, you may want to use :null_session instead.
  protect_from_forgery with: :exception

  before_filter :store_referer

  def store_referer
  	http_referer = request.env['HTTP_REFERER']
  	internal = /^(https?:\/\/)?(www.)?YOUR_DOMAIN.com.*/.match(http_referer)
  	if !internal #ignore internal referers
		session[:referer] = http_referer || 'none'
	elsif session[:referer].nil?
		session[:referer] = http_referer || 'none'
	end
  end
end

Add a hidden field to your mail form:

# Uses simple_form
<%= f.input :referer, input_html: { value: session[:referer] }, as: :hidden %>

Add the attribute to your mail_form model:

class Contact < MailForm::Base
  attribute :name,      :validate => true
  attribute :email,     :validate => /\A([\w\.%\+\-]+)@([\w\-]+\.)+([\w]{2,})\z/i
  attribute :message
  attribute :referer

  ...
end