here come the tags

app/views/clips/_form.html.erb

@@ -4,6 +4,7 @@
     <%= form.text_field :title %>
     <%= form.file_field :video, :accept => 'video/quicktime,video/mp4' %>
     <%= form.select :category_id, Category.all.collect{ |t| [ t.name, t.id ] }%>
+    <%= collection_select(:clip, :tag_ids, Tag.all, :id, :name, {}, { :multiple => true } )%>
   </div>
 
   <div>

app/views/clips/show.html.erb

@@ -2,6 +2,7 @@
   <h1><%= @clip.title %></h1>
 <% end %>
 <b>Category:</b> <%= link_to @clip.category.name, @clip.category %><br>
+<b>Tags:</b> <%= @clip.tags.map(&:name).join(', ') %><br>
 <% if @clip.video.attached? %>
 <%= video_tag @clip.video, :controls => true%>
 <% end %>