implemented javascripts for approval/disapproval/unapproval from post/show page

app/controllers/post_moderation_controller.rb

@@ -1,22 +1,50 @@
 class PostModerationController < ApplicationController
-  respond_to :html, :xml, :json
   before_filter :janitor_only
+  rescue_from Post::ApprovalError, :with => :approval_error
+  rescue_from Post::DisapprovalError, :with => :disapproval_error
   
   def moderate
     @search = Post.pending.available_for_moderation.search(params[:search]).order("id asc")
     @posts = @search.paginate(:page => params[:page])
-    respond_with(@posts)
+    respond_to do |format|
+      format.html
+      format.json {render :json => @posts.to_json}
+    end
   end
   
   def approve
     @post = Post.find(params[:post_id])
     @post.approve!
-    respond_with(@post, :location => post_moderation_moderate_path)
+    respond_to do |format|
+      format.html {redirect_to(post_moderation_moderate_path, :notice => "Post approved")}
+      format.js
+    end
   end
   
   def disapprove
     @post = Post.find(params[:post_id])
     @post_disapproval = PostDisapproval.create(:post => @post, :user => CurrentUser.user)
-    respond_with(@post_disapproval, :location => post_moderation_moderate_path)
+    if @post_disapproval.errors.any?
+      raise Post::DisapprovalError.new(@post_disapproval.errors.full_messages)
+    end
+    respond_to do |format|
+      format.html {redirect_to(post_moderation_moderate_path, :notice => "Post disapproved")}
+      format.js
+    end
+  end
+  
+private
+  def disapproval_error(e)
+    respond_to do |format|
+      format.html {redirect_to(post_moderation_moderate_path, :notice => "You have already disapproved this post")}
+      format.js {render :action => "disapproval_error"}
+    end
+  end
+  
+  def approval_error(e)
+    respond_to do |format|
+      format.html {redirect_to(post_moderation_moderate_path, :notice => e.message)}
+      format.js {@exception = e; render :action => "approval_error"}
+    end
   end
 end

app/controllers/unapprovals_controller.rb

@@ -1,6 +1,6 @@
 class UnapprovalsController < ApplicationController
   before_filter :member_only
-  respond_to :html, :xml, :json
+  respond_to :html, :xml, :json, :js
   rescue_from User::PrivilegeError, :with => "static/access_denied"
 
   def new
@@ -15,7 +15,7 @@ class UnapprovalsController < ApplicationController
   
   def create
     @unapproval = Unapproval.create(params[:unapproval])
-    respond_with(@unapproval, :location => post_path(@unapproval.post_id))
+    respond_with(@unapproval)
   end
   
   def destroy