handle some common error cases

app/controllers/application_controller.rb

@@ -18,6 +18,10 @@ protected
       @exception = nil
       @error_message = "The database timed out running your query."
       render :template => "static/error", :status => 500
+    elsif exception.is_a?(::ActiveRecord::RecordNotFound)
+      @exception = nil
+      @error_message = "That record was not found", :status => 404
+      render :template => "static/error", :status => 500
     else
       render :template => "static/error", :status => 500
     end

app/controllers/comment_votes_controller.rb

@@ -1,5 +1,6 @@
 class CommentVotesController < ApplicationController
   respond_to :js
+  before_filter :member_only
   
   def create
     @comment = Comment.find(params[:comment_id])

app/controllers/posts_controller.rb

@@ -5,6 +5,7 @@ class PostsController < ApplicationController
   rescue_from PostSets::SearchError, :with => :rescue_exception
   rescue_from Post::SearchError, :with => :rescue_exception
   rescue_from ActiveRecord::StatementInvalid, :with => :rescue_exception
+  rescue_from ActiveRecord::RecordNotFound, :with => :rescue_exception
   
   def index
     @post_set = PostSets::Post.new(tag_query, params[:page], params[:limit])

app/controllers/wiki_pages_controller.rb

@@ -3,6 +3,7 @@ class WikiPagesController < ApplicationController
   before_filter :member_only, :except => [:index, :show, :show_or_new]
   before_filter :moderator_only, :only => [:destroy]
   before_filter :normalize_search_params, :only => [:index]
+  rescue_from ActiveRecord::StatementInvalid, :with => :rescue_exception
 
   def new
     @wiki_page = WikiPage.new(params[:wiki_page])
@@ -26,7 +27,11 @@ class WikiPagesController < ApplicationController
   end
   
   def show
-    @wiki_page = WikiPage.find(params[:id])
+    if params[:id] =~ /[a-zA-Z]/
+      @wiki_page = WikiPage.find_by_title(params[:id])
+    else
+      @wiki_page = WikiPage.find(params[:id])
+    end
     respond_with(@wiki_page)
   end