update_posts_controller.rb

  # Update the attributes of a post/article/kata, and generate a notice if the changes could
  # be saved or retry to edit otherwise.
  # The attributes to be saved are different between Post and Kata.
  # For Post, tags and source url need to be saved.
  # For Kata, categories, challenge level and source url need to be saved.
  
 def update
    @post = post_type.find_by_slug(params[:id])
    authorize! :update, @post
    @form = params[@type.downcase.to_sym]
    if post_type == Post
      @post.tempTags = @form[:tempTags]
      @post.setTags
      @post.source_url = params[@type.downcase.to_sym][:source_url]
    elsif post_type == Kata
      @post.category_ids = @form[:category_tokens].to_s.split(",")
      @post.challenge_level = @form[:challenge_level]
      @post.source_url = params[@type.downcase.to_sym][:source_url]
    end
    @post.title = @form[:title]
    @post.content = params[@type.downcase.to_sym][:content]

    respond_to do |format|
      if @post.save
        format.html { redirect_to(@post, :notice => "#{@type} was successfully updated.") }
        format.xml { head :ok }
      else
        format.html { render :action => "edit" }
        format.xml { render :xml => @post.errors, :status => :unprocessable_entity }
      end
    end
  end