zips all users with newsletter activated

app/controllers/admin/newsletters_controller.rb

@@ -9,7 +9,9 @@ class Admin::NewslettersController < Admin::BaseController
     zipfile_name = folder + "emails.zip"
 
     Zip::File.open(zipfile_name, Zip::File::CREATE) do |zipfile|
-      zipfile.get_output_stream("emails.txt") { |os| os.write 'peter@example.com' }
+      zipfile.get_output_stream("emails.txt") do |os|
+        os.write User.newsletter.pluck(:email).join("\n")
+      end
     end
     send_file(File.join(folder + "emails.zip"), :type => 'application/zip')
   end

app/models/user.rb

@@ -52,6 +52,7 @@ class User < ActiveRecord::Base
   scope :moderators,     -> { joins(:moderator) }
   scope :organizations,  -> { joins(:organization) }
   scope :officials,      -> { where("official_level > 0") }
+  scope :newsletter,     -> { where(newsletter: true) }
   scope :for_render,     -> { includes(:organization) }
   scope :by_document,    -> (document_type, document_number) { where(document_type: document_type, document_number: document_number) }
   scope :email_digest,   -> { where(email_digest: true) }