show attachment in view and make it downloadable

app/assets/stylesheets/tracks.css.scss

@@ -124,6 +124,11 @@ img.delete_item {
     }
 }
 
+a.todo_attachment {
+    background: image-url('bottom_off.png') no-repeat top;
+    border: none;
+}
+
 a.undecorated_link {background-color:transparent;color:transparent;}
 img.todo_star {background-image: image-url('staricons.png'); background-repeat: no-repeat; border:none; background-position: -32px 0px;}
 img.todo_star.starred{ background-position: 0px 0px; }

app/controllers/todos_controller.rb

@@ -815,6 +815,20 @@ class TodosController < ApplicationController
     end
   end
 
+  def attachment
+    id = params[:id]
+    filename = params[:filename]
+    attachment = current_user.attachments.find(id)
+
+    if attachment
+      send_file(attachment.file.path,
+        disposition: 'attachment',
+        type: 'message/rfc822')
+    else
+      head :not_found
+    end
+  end
+
   private
 
   def set_group_view_by

app/helpers/todos_helper.rb

@@ -204,6 +204,14 @@ module TodosHelper
     link_to(t('todos.convert_to_project'), url, {:class => "icon_item_to_project", :id => dom_id(todo, "to_project")})
   end
 
+  def attachment_image(todo)
+    link_to(
+      image_tag('blank.png', width: 16, height: 16, border:0),
+      todo.attachments.first.file.url,
+      {:class => 'todo_attachment', title: 'Get attachments of this todo'}
+    )
+  end
+
   def collapsed_notes_image(todo)
     link = link_to(
       image_tag( 'blank.png', :width=>'16', :height=>'16', :border=>'0' ),

app/views/todos/_todo.html.erb

@@ -41,6 +41,7 @@ cache [todo, current_user.date.strftime("%Y%m%d"), @source_view, current_user.pr
         <%= project_and_context_links( todo, parent_container_type, :suppress_context => suppress_context, :suppress_project => suppress_project ) %>
         <%= collapsed_notes_image(todo) if todo.notes.present? %>
         <%= collapsed_successors_image(todo) if todo.has_pending_successors %>
+        <%= attachment_image(todo) if todo.attachments.present? %>
       </div>
     </div>
     <div id="<%= dom_id(todo, 'edit') %>" class="edit-form" style="display:none">