首先，我想说我在轨道上非常新，所以我是一个菜鸟。
当我尝试从应用程序（论坛怪物）root / forums / new访问“新论坛页面”时，我收到此错误：
ActiveRecord::RecordNotFound in ForumsController#new
Couldn't find Category with id=
这是我的用户模型：
class User < ActiveRecord::Base
include Gravtastic
gravtastic :size => 165, :filetype => :png, :rating => 'R'
# Include default devise modules. Others available are:
# :token_authenticatable, :encryptable, :confirmable, :lockable, :timeoutable and :omniauthable
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable, :confirmable
validates :email, :username, :presence => true, :uniqueness => true
# Setup accessible (or protected) attributes for your model
attr_accessible :name, :username, :email, :password, :password_confirmation, :remember_me
has_many :topics, :dependent => :destroy
has_many :posts, :dependent => :destroy
def admin?
true if self.username == 'admin'
end
end
这是我的路线：
Community::Application.routes.draw do
resources :categories, :except => [:index, :show]
resources :forums, :except => :index do
resources :topics, :shallow => true, :except => :index do
resources :posts, :shallow => true, :except => [:index, :show]
end
root :to => 'categories#index', :via => :get
end
devise_for :users
root :to => 'categories#index', :via => :get
resources :users
# The priority is based upon order of creation:
# first created -> highest priority.
# Sample of regular route:
# match 'products/:id' => 'catalog#view'
# Keep in mind you can assign values other than :controller and :action
# Sample of named route:
# match 'products/:id/purchase' => 'catalog#purchase', :as => :purchase
# This route can be invoked with purchase_url(:id => product.id)
# Sample resource route (maps HTTP verbs to controller actions automatically):
# resources :products
# Sample resource route with options:
# resources :products do
# member do
# get 'short'
# post 'toggle'
# end
#
# collection do
# get 'sold'
# end
# end
# Sample resource route with sub-resources:
# resources :products do
# resources :comments, :sales
# resource :seller
# end
# Sample resource route with more complex sub-resources
# resources :products do
# resources :comments
# resources :sales do
# get 'recent', :on => :collection
# end
# end
# Sample resource route within a namespace:
# namespace :admin do
# # Directs /admin/products/* to Admin::ProductsController
# # (app/controllers/admin/products_controller.rb)
# resources :products
# end
# You can have the root of your site routed with "root"
# just remember to delete public/index.html.
# root :to => "welcome#index"
# See how all your routes lay out with "rake routes"
# This is a legacy wild controller route that's not recommended for RESTful applications.
# Note: This route will make all actions in every controller accessible via GET requests.
# match ':controller(/:action(/:id(.:format)))'
end
这是我的视图文件：
<div class="module">
<div class="module_header"><%= action_name.humanize %> Forum</div>
<div class="module_subheader smaller">
<em>To create a category, leave the category field unselected.</em>
</div>
<div class="module_body">
<%= form_for @forum do |f| %>
<% if @forum.errors.any? %>
<% flash.now[:error] = @forum.errors.full_messages.join(', and ') %>
<% end %>
<div class="fieldset">
<span class="label indent smaller">
<%= f.label :category_id %><br />
<small>(Required)</small>
</span>
<span class="input indent smaller">
<%= f.collection_select :category_id, Category.all, :id, :title %>
</span>
<div class="clear"></div>
</div>
<div class="fieldset">
<span class="label indent smaller">
<%= f.label :title %><br />
<small>(Required)</small>
</span>
<span class="input indent smaller"><%= f.text_field :title, :size => 75 %></span>
<div class="clear"></div>
</div>
<div class="fieldset">
<span class="label indent smaller">
<%= f.label :description %><br />
<small>(Required)</small>
</span>
<span class="input indent smaller"><%= f.text_area :description, :cols => 60, :rows => 5 %></span>
<div class="clear"></div>
</div>
<div class="fieldset">
<span class="label indent smaller">
<%= f.label :position %>
</span>
<span class="input indent smaller"><%= f.text_field :position %></span>
<div class="clear"></div>
</div>
<div class="fieldset">
<span class="label indent smaller"></span>
<span class="input indent smaller">
<%= f.check_box :state %>
<%= f.label :state %>
</span>
<div class="clear"></div>
</div>
</div>
<div class="module_footer">
<div class="fieldset">
<span class="input"><%= f.submit "submit" %> or <%= link_to "cancel", @forum.nil? ? forum_path(@forum) : forums_path %></span>
<div class="clear"></div>
</div>
</div>
<% end %>
</div>
</div>
编辑：
这是我的论坛控制器：
class ForumsController < ApplicationController
load_and_authorize_resource :category
load_and_authorize_resource :forum, :through => :category, :shallow => true
def create
if @forum.save
flash[:notice] = "Forum was successfully created."
redirect_to forums_url
else
render :action => 'new'
end
end
def update
if @forum.update_attributes(params[:forum])
flash[:notice] = "Forum was updated successfully."
redirect_to forum_url(@forum)
end
end
def destroy
if @forum.destroy
flash[:notice] = "Category was deleted."
redirect_to forums_url
end
end
end
这里也是我的分类控制器：
class CategoriesController < ApplicationController
load_and_authorize_resource :category
def create
if @category.save
flash[:notice] = "Category was successfully created."
redirect_to forums_url
else
render :action => 'new'
end
end
def update
if @category.update_attributes(params[:category])
flash[:notice] = "Category was updated successfully."
redirect_to forums_url
end
end
def destroy
if @category.destroy
flash[:notice] = "Category was deleted."
redirect_to forums_url
end
end
end
EDIT2： 我的gemfile：
source 'http://rubygems.org'
gem 'rails', '3.2.14'
gem 'sqlite3'
gem 'forum_monster', '~> 1.0.3'
gem 'devise'
gem 'cancan'
gem 'gravtastic', :git => 'https://github.com/chrislloyd/gravtastic.git'
gem 'bb-ruby'
group :development do
gem 'hirb'
gem 'heroku'
end
group :production do
gem 'unicorn'
end
对不起是noob，我是新手。
答案 0 :(得分：1)
我对CanCan没有足够的经验用尽可能多的信心来说这个，但我认为你的load_and_authorize_resource在ForumsController中已经关闭了。
如果您的资源是这样的话，我认为您正在做的事情会有意义：
resources :categories do
resources :forums
...
但是，如果没有这种嵌套，论坛控制器中的load_and_authorize_resource :category正在寻找使用不存在的数据初始化@category。
如果我的怀疑是正确的（我可能会错误地解释这里发生了什么），我认为修复应该很简单 - 只需将头部的load_and_authorize_resource语句减少为单load_and_authorize_resource个语句没有参数。我不认为这样做会有问题，但我认为这取决于@category背后的安全性。