comments_controller.rb

include Rakismet::Controller
rakismet_filter :only => :create


def create
    @post = Post.find(params[:post_id])
    @comment = @post.comments.build(params[:comment])
    
    if @comment.spam?
      flash[:error] = "This comment looks a lot like spam."
      render :template => 'posts/show', :layout => 'posts'
    else
      if @comment.save
        flash[:notice] = "Comment posted successfully."
        redirect_to @post
      else
        render :template => 'posts/show', :layout => 'posts'
      end
    end    
end