Beispiele als ZIP Datei

Gemfile

@@ -98,3 +98,4 @@ gem "seed_dump", "~> 0.5.3"
 #gem "themes_for_rails", :git=> 'git://github.com/lucasefe/themes_for_rails.git'
 gem 'themes_for_rails'
 
+gem 'rubyzip'

app/controllers/lvas_controller.rb

@@ -1,5 +1,6 @@
 class LvasController < ApplicationController
   # GET /lvas
+  require 'zip'
   before_filter :load_toolbar, :only => [:show]
   load_and_authorize_resource
   def index
@@ -9,7 +10,34 @@ class LvasController < ApplicationController
          {:hicon=>'icon-list', :text=>I18n.t("modul.list"),:path=>moduls_path},
          {:hicon=>'icon-list', :text=>I18n.t("lva.list"),:path=>lvas_path}]
   end
+  def beispiel_sammlung
+    @lva = Lva.find_by_id(params[:id])
+    #Attachment name
+    filename = 'beispiel_sammlung_' + @lva.lvanr.to_s + '_' + l(Date.today).to_s + '.zip'
+    temp_file = Tempfile.new(filename) 
+    begin
+      #This is the tricky part
+      #Initialize the temp file as a zip file
+      Zip::OutputStream.open(temp_file) { |zos| }
+      #Add files to the zip file as usual
+      Zip::File.open(temp_file.path, Zip::File::CREATE) do |zip|
+        #Put files in here
+        i=1
+        @lva.beispiele.each do |bsp|
+          zip.add(i.to_s + '_' + File.basename(bsp.beispieldatei.current_path), bsp.beispieldatei.current_path)
+          i = i + 1
+        end
         
+      end
+      #Read the binary data from the file
+      zip_data = File.read(temp_file.path)
+      send_data(zip_data, :type => 'application/zip', :filename => filename)
+    ensure
+      #Close and delete the temp file
+      temp_file.close
+      temp_file.unlink
+    end
+  end
   # GET /lvas/1
 
   def show

app/views/lvas/show.html.erb

@@ -23,6 +23,7 @@
       </div>
       
       <h2>Beispiele</h2>
+      <%= link_to t("beispiel.zip") , beispiel_sammlung_lva_path(@lva), class: :linkbox %>
       <% @lva.beispiele.each do |b| %>
       <%= render b%>
       <% end %>

config/locales/studien_public.de.yml

@@ -16,6 +16,7 @@ de:
     beschreibung: "Keine Beschreibung vorhanden"
   beispiel:
     add: "Beispiel hinzufügen"
+    zip: "Alle Beispiele als ZIP Datei"
   lecturers:
     lecturers: "Vortragende"
   file:
@@ -23,3 +24,5 @@ de:
   semester:
     ohne: "Ohne Semesterzuordnung"
     semester: "Semester"
+  home:
+    newexamples: "Neueste Beispiele"

config/routes.rb

@@ -65,6 +65,7 @@ Fetsite::Application.routes.draw do
       resources :beispiele#, :only=>[:show,:index,:create]
       resources :lvas  do 
         member do
+          get 'beispiel_sammlung'
           get 'compare_tiss'
           get 'load_tiss'
         end