check for photo existence before offering options or the file

app/controllers/photos.rb

@@ -8,9 +8,9 @@ class Photos < Application
     raise NotFound unless @photo
     @secondary_title = h(@photo.filename)
     
-    img = get_photo_version(600, 600)
-    @width = img.columns
-    @height = img.rows
+    img = get_photo_version(600, 600) rescue nil
+    @width = img.columns rescue 150
+    @height = img.rows rescue 150
     
     render
   end
@@ -68,21 +68,24 @@ class Photos < Application
     end
   end
 
-  def thumbnail
+  def send_rmagicked_image
     only_provides :html
     @photo = Photo.find(params[:id])
     raise NotFound unless @photo
-    send_data get_photo_version(150, 150).to_blob,
+    if @photo.exist?
+      w = case params[:action]
+        when 'screen'
+          600
+        else
+          150
+      end
+      send_data get_photo_version(w, w).to_blob,
         :filename => @photo.filename, :disposition => 'inline',
         :type => @photo.content_type
+    else
+      send_file Merb.root + '/public/images/image-missing.png', :disposition => 'inline'
     end
-  
-  def screen
-    only_provides :html
-    @photo = Photo.find(params[:id])
-    raise NotFound unless @photo
-    send_data get_photo_version(600, 600).to_blob,
-      :filename => @photo.filename, :disposition => 'inline',
-      :type => @photo.content_type
   end
+  alias_method :thumbnail, :send_rmagicked_image
+  alias_method :screen, :send_rmagicked_image
 end

app/views/photos/show.html.erb

@@ -5,7 +5,11 @@
   padding: 0px;
   width: <%= @width -%>px;
   height: <%= @height -%>px;
+<% if @photo.exist? -%>
   background-image: url('/photos/screen/<%= @photo.id -%>');
+<% else -%>
+  background-image: url('/images/image-missing.png');
+<% end -%>
   background-repeat: no-repeat;
 }
 #photo_block_container {
@@ -203,9 +207,11 @@ function toggle_photo_tag_editor(direction)
   </div>
 </div>
 
+<% if @photo.exist? -%>
 <div id="photo_tags">
   <%= partial 'photo_tags/photo_tags' %>
 </div>
+<% end -%>
 
 <script type="text/javascript">
   //<![CDATA[
@@ -223,9 +229,9 @@ function toggle_photo_tag_editor(direction)
 
 <% throw_content :for_sidebar do -%>
   <a href="<%= url(:album, :id => @photo.album.name.gsub(/ /, '_')) -%>"><img src="/images/camera-photo.png" /> Back to <%= @photo.album.name -%></a><br />
-  <% if allowed_to?(:edit_photo, @photo) -%><a href="<%= url(:edit_photo, :id => @photo.id) -%>" rel="nofollow"><img src="/images/document-save.png" /> Edit photo</a><br /><% end %>
+  <% if allowed_to?(:edit_photo, @photo) and @photo.exist? -%><a href="<%= url(:edit_photo, :id => @photo.id) -%>" rel="nofollow"><img src="/images/document-save.png" /> Edit photo</a><br /><% end %>
   <% if allowed_to?(:delete_photo, @photo) -%><a href="<%= url(:delete_photo, :id => @photo.id) -%>" onclick="if(!confirm('Are you sure you want to delete this photo?')){return false;}" rel="nofollow"><img src="/images/edit-delete.png" /> Destroy photo</a><br /><% end -%>
-  <a href="<%= photo_url(@photo) -%>"><img src="/images/image-x-generic.png" /> Download original</a><br />
+  <% if @photo.exist? -%><a href="<%= photo_url(@photo) -%>"><img src="/images/image-x-generic.png" /> Download original</a><br /><% end -%>
   <% if allowed_to?(:upload_images) -%><a href="<%= url(:new_photo, :photo => { :album_id => @photo.album_id }) -%>"><img src="/images/emblem-photos.png" /> Upload Image</a><br /><% end %>
-  <% if allowed_to?(:tag_photo) -%><span id="show_photo_tag_editor"><a href="#" onclick="toggle_photo_tag_editor(true)"><img src="/images/face-monkey.png" /> Tag Image</a></span><span id="hide_photo_tag_editor" style="display: none;"><a href="#" onclick="toggle_photo_tag_editor(false); return false;"><img src="/images/face-monkey.png" /> Done Tagging</a></span><br /><% end %>
+  <% if allowed_to?(:tag_photo) and @photo.exist? -%><span id="show_photo_tag_editor"><a href="#" onclick="toggle_photo_tag_editor(true)"><img src="/images/face-monkey.png" /> Tag Image</a></span><span id="hide_photo_tag_editor" style="display: none;"><a href="#" onclick="toggle_photo_tag_editor(false); return false;"><img src="/images/face-monkey.png" /> Done Tagging</a></span><br /><% end %>
 <% end -%>