refactors zip file creation

lib/newsletter_zip.rb

@@ -0,0 +1,25 @@
+require 'zip'
+class NewsletterZip
+  attr_accessor :filename
+
+  def initialize(filename)
+    @filename = filename
+  end
+
+  def emails
+    User.newsletter.pluck(:email).join("\n")
+  end
+
+  def path
+    Rails.root + "/tmp/#{filename}.zip"
+  end
+
+  def create
+    Zip::File.open("#{filename}.zip", Zip::File::CREATE) do |zipfile|
+      zipfile.get_output_stream("#{filename}.txt") do |file|
+        file.write emails
+      end
+    end
+  end
+
+end