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我想在我的应用上将两个Railscasts合并到一起:http://railscasts.com/episodes/262-trees-with-ancestry和http://railscasts.com/episodes/154-polymorphic-association。祖先问题的多态性评论
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我有这样的代码:
<%= render @comments %>
<%= render "comments/form" %>
哪个正常输出。我有一个_comment.html.erb
文件,用于呈现每个评论等,以及一个_form.html.erb
文件,该文件为新评论创建表单。
我的问题是,当我尝试<%= nested_comments @comments %>
我得到undefined method 'arrange'
。
我做了一些谷歌搜索和常见的解决方案是在排列之前添加subtree
,但也引发和未定义的错误。我猜测多态关联是这里的问题,但我对如何解决这个问题不知所措。