implement CSV and XLS export for map topics

app/controllers/maps_controller.rb

@@ -2,7 +2,7 @@ class MapsController < ApplicationController
 
     before_filter :require_user, only: [:create, :update, :screenshot, :destroy]
 
-    respond_to :html, :json
+    respond_to :html, :json, :csv
 
     autocomplete :map, :name, :full => true, :extra_data => [:user_id]
 
@@ -86,6 +86,8 @@ class MapsController < ApplicationController
                 respond_with(@allmappers, @allmappings, @allsynapses, @alltopics, @map) 
             }
             format.json { render json: @map }
+            format.csv { send_data @map.to_csv }
+            format.xls
         end
     end
 

app/models/map.rb

@@ -82,6 +82,20 @@ class Map < ActiveRecord::Base
     json
   end
 
+  def to_csv(options = {})
+    CSV.generate(options) do |csv|
+      csv << ["id", "name", "permission", "user.name"]
+      self.topics.each do |topic|
+        csv << [
+          topic.id,
+          topic.name,
+          topic.permission,
+          topic.user.name
+        ]
+      end
+    end
+  end
+
   ##### PERMISSIONS ######
   
   def authorize_to_delete(user)

app/views/maps/show.xls.erb

@@ -0,0 +1,16 @@
+<table>
+  <tr>
+    <th>ID</th>
+    <th>Name</th>
+    <th>Permission</th>
+    <th>Username</th>
+  </tr>
+  <% @map.topics.each do |topic| %>
+  <tr>
+    <td><%= topic.id %></td>
+    <td><%= topic.name %></td>
+    <td><%= topic.permission %></td>
+    <td><%= topic.user.name %></td>
+  </tr>
+  <% end %>
+</table>

config/application.rb

@@ -1,5 +1,6 @@
 require File.expand_path('../boot', __FILE__)
 
+require 'csv'
 require 'rails/all'
 
 if defined?(Bundler)

config/initializers/mime_types.rb

@@ -3,3 +3,5 @@
 # Add new mime types for use in respond_to blocks:
 # Mime::Type.register "text/richtext", :rtf
 # Mime::Type.register_alias "text/html", :iphone
+
+Mime::Type.register "application/xls", :xls