我正在尝试将两个 Railscast 组合在一起:http ://railscasts.com/episodes/262-trees-with-ancestry和http://railscasts.com/episodes/154-polymorphic-association在我的应用程序上。
我的模型:
class Location < ActiveRecord::Base
has_many :comments, :as => :commentable, :dependent => :destroy
end
class Comment < ActiveRecord::Base
belongs_to :commentable, :polymorphic => true
end
我的控制器:
class LocationsController < ApplicationController
def show
@location = Location.find(params[:id])
@comments = @location.comments.arrange(:order => :created_at)
respond_to do |format|
format.html # show.html.erb
format.json { render json: @location }
end
end
end
class CommentsController < InheritedResources::Base
def index
@commentable = find_commentable
@comments = @commentable.comments.where(:company_id => session[:company_id])
end
def create
@commentable = find_commentable
@comment = @commentable.comments.build(params[:comment])
@comment.user_id = session[:user_id]
@comment.company_id = session[:company_id]
if @comment.save
flash[:notice] = "Successfully created comment."
redirect_to :id => nil
else
render :action => 'new'
end
end
private
def find_commentable
params.each do |name, value|
if name =~ /(.+)_id$/
return $1.classify.constantize.find(value)
end
end
nil
end
end
在我的位置显示视图中,我有以下代码:
<%= render @comments %>
<%= render "comments/form" %>
哪个输出正确。我有一个_comment.html.erb
呈现每个评论等的_form.html.erb
文件和一个为新评论创建表单的文件。
我遇到的问题是,当我尝试时,<%= nested_comments @comments %>
我得到了undefined method 'arrange'
.
我做了一些谷歌搜索,常见的解决方案是subtree
在安排之前添加,但这也会引发和未定义的错误。我猜多态关联是这里的问题,但我不知道如何解决它。