多級commentable處理

  #  獲取父节点群
  # params = {'other' => 'other','person_id' => 'admin', 'blog_id' => '3', 'post_id' => '1'}
  def get_parent
    return @parent if defined?(@parent)
    parent = {}
    params.each do |name, value|
      if name =~ /(.+)_id$/
        if parent.empty?
          parent = {:type => $1, :id => value, :path => $1, :ids => {}, :pids => {'id' => value}}
        else
          parent[:path] = "#{$1}_#{parent[:path]}"
          parent[:pids][name] = value
          parent[:ids][name] = value
        end
      end 
    end
    @parent = parent
  end

def create
    # :type=>"post"
    @commentable = @parent[:type].classify.constantize.find(@parent[:id])
    @comment = @commentable.comments.new(params[:comment])
    @comment.author = current_person
    flash[:success] = I18n.t('person.successful.created') if @comment.save
    respond_with(@comment, :location => commentable_path)
end

private # 聲明私有
  def commentable_path
    # :path=>"person_blog_post"
    # :pids=>{"blog_id"=>"3", "id"=>"1", "person_id"=>"admin"}
    send("#{@parent[:path]}_path", @parent[:pids])
  end

  def destroy
    # :type=>"post"
    # :id=>"1"
    @comment = Comment.where(
    	:commentable_type => @parent[:type].capitalize!, 
    	:commentable_id => @parents.last[:id], 
    	:_id => params[:id]
    ).first
    flash[:success] = I18n.t('person.successful.destroyed') if @comment.destroy
    respond_with(flash[:success], :location => commentable_path)
  end

引用

app/viewscomments/new.zh.html.erb

  # :path=>"person_blog_post"
  # :ids=>{"blog_id"=>"3", "person_id"=>"admin"}

<%= form_for @comment, :url => send("#{@parent[:path]}_comments_path", @parent[:ids]) do |f| %>