使用mongoid_slug與CanCan的load_and_authorize_resource

Question

我使用了cancan，Mongoid和Mongoid_slug的Rails 3.1.1。

我的模型是使用slu which，似乎工作正常，除非cancan嘗試爲顯示/編輯操作加載資源。這導致了這個錯誤。

Mongoid::Errors::DocumentNotFound in PagesController#show 

Document not found for class Page with id(s) test. 

mongoid (2.3.4) lib/mongoid/criterion/inclusion.rb:151:in `block in execute_or_raise' 
mongoid (2.3.4) lib/mongoid/criterion/inclusion.rb:149:in `tap' 
mongoid (2.3.4) lib/mongoid/criterion/inclusion.rb:149:in `execute_or_raise' 
mongoid (2.3.4) lib/mongoid/criterion/inclusion.rb:129:in `find' 
mongoid (2.3.4) lib/mongoid/finders.rb:84:in `find' 
cancan (1.6.7) lib/cancan/model_adapters/abstract_adapter.rb:20:in `find' 
cancan (1.6.7) lib/cancan/controller_resource.rb:110:in `find_resource' 
cancan (1.6.7) lib/cancan/controller_resource.rb:68:in `load_resource_instance' 
cancan (1.6.7) lib/cancan/controller_resource.rb:32:in `load_resource' 
cancan (1.6.7) lib/cancan/controller_resource.rb:25:in `load_and_authorize_resource' 
cancan (1.6.7) lib/cancan/controller_resource.rb:10:in `block in add_before_filter' 
activesupport (3.1.1) lib/active_support/callbacks.rb:421:in `_run__438852266152246612__process_action__2308888977565164453__callbacks' 
activesupport (3.1.1) lib/active_support/callbacks.rb:386:in `_run_process_action_callbacks' 
activesupport (3.1.1) lib/active_support/callbacks.rb:81:in `run_callbacks' 
actionpack (3.1.1) lib/abstract_controller/callbacks.rb:17:in `process_action' 
actionpack (3.1.1) lib/action_controller/metal/rescue.rb:17:in `process_action' 
actionpack (3.1.1) lib/action_controller/metal/instrumentation.rb:30:in `block in process_action' 
activesupport (3.1.1) lib/active_support/notifications.rb:53:in `block in instrument' 
activesupport (3.1.1) lib/active_support/notifications/instrumenter.rb:21:in `instrument' 
activesupport (3.1.1) lib/active_support/notifications.rb:53:in `instrument' 
actionpack (3.1.1) lib/action_controller/metal/instrumentation.rb:29:in `process_action' 
actionpack (3.1.1) lib/action_controller/metal/params_wrapper.rb:201:in `process_action' 
actionpack (3.1.1) lib/abstract_controller/base.rb:121:in `process' 
actionpack (3.1.1) lib/abstract_controller/rendering.rb:45:in `process' 
actionpack (3.1.1) lib/action_controller/metal.rb:193:in `dispatch' 
actionpack (3.1.1) lib/action_controller/metal/rack_delegation.rb:14:in `dispatch' 
actionpack (3.1.1) lib/action_controller/metal.rb:236:in `block in action' 
actionpack (3.1.1) lib/action_dispatch/routing/route_set.rb:65:in `call' 
actionpack (3.1.1) lib/action_dispatch/routing/route_set.rb:65:in `dispatch' 
actionpack (3.1.1) lib/action_dispatch/routing/route_set.rb:29:in `call' 
rack-mount (0.8.3) lib/rack/mount/route_set.rb:152:in `block in call' 
rack-mount (0.8.3) lib/rack/mount/code_generation.rb:96:in `block in recognize' 
rack-mount (0.8.3) lib/rack/mount/code_generation.rb:96:in `optimized_each' 
rack-mount (0.8.3) lib/rack/mount/code_generation.rb:95:in `recognize' 
rack-mount (0.8.3) lib/rack/mount/route_set.rb:141:in `call' 
actionpack (3.1.1) lib/action_dispatch/routing/route_set.rb:532:in `call' 
mongoid (2.3.4) lib/rack/mongoid/middleware/identity_map.rb:33:in `block in call' 
mongoid (2.3.4) lib/mongoid.rb:132:in `unit_of_work' 
mongoid (2.3.4) lib/rack/mongoid/middleware/identity_map.rb:33:in `call' 
warden (1.1.0) lib/warden/manager.rb:35:in `block in call' 
warden (1.1.0) lib/warden/manager.rb:34:in `catch' 
warden (1.1.0) lib/warden/manager.rb:34:in `call' 
actionpack (3.1.1) lib/action_dispatch/middleware/best_standards_support.rb:17:in `call' 
rack (1.3.5) lib/rack/etag.rb:23:in `call' 
rack (1.3.5) lib/rack/conditionalget.rb:25:in `call' 
actionpack (3.1.1) lib/action_dispatch/middleware/head.rb:14:in `call' 
actionpack (3.1.1) lib/action_dispatch/middleware/params_parser.rb:21:in `call' 
actionpack (3.1.1) lib/action_dispatch/middleware/flash.rb:243:in `call' 
rack (1.3.5) lib/rack/session/abstract/id.rb:195:in `context' 
rack (1.3.5) lib/rack/session/abstract/id.rb:190:in `call' 
actionpack (3.1.1) lib/action_dispatch/middleware/cookies.rb:331:in `call' 
actionpack (3.1.1) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call' 
activesupport (3.1.1) lib/active_support/callbacks.rb:392:in `_run_call_callbacks' 
activesupport (3.1.1) lib/active_support/callbacks.rb:81:in `run_callbacks' 
actionpack (3.1.1) lib/action_dispatch/middleware/callbacks.rb:28:in `call' 
actionpack (3.1.1) lib/action_dispatch/middleware/reloader.rb:68:in `call' 
rack (1.3.5) lib/rack/sendfile.rb:101:in `call' 
actionpack (3.1.1) lib/action_dispatch/middleware/remote_ip.rb:48:in `call' 
actionpack (3.1.1) lib/action_dispatch/middleware/show_exceptions.rb:47:in `call' 
railties (3.1.1) lib/rails/rack/logger.rb:13:in `call' 
rack (1.3.5) lib/rack/methodoverride.rb:24:in `call' 
rack (1.3.5) lib/rack/runtime.rb:17:in `call' 
activesupport (3.1.1) lib/active_support/cache/strategy/local_cache.rb:72:in `call' 
rack (1.3.5) lib/rack/lock.rb:15:in `call' 
actionpack (3.1.1) lib/action_dispatch/middleware/static.rb:53:in `call' 
railties (3.1.1) lib/rails/engine.rb:456:in `call' 
railties (3.1.1) lib/rails/railtie/configurable.rb:30:in `method_missing' 

頁面模型

class Page 
    include Mongoid::Document 
    include Mongoid::Timestamps 
    include Mongoid::Slug 

    field :title, type:String 
    field :body, type:String 

    belongs_to :user 

    slug :title, :scope => :user 

    validates :title, :presence => true 
    validates :body, :presence => true 
end 

控制器

class PagesController < ApplicationController 
    load_and_authorize_resource 

    def index 
    respond_to do |format| 
     format.html # index.html.erb 
     format.json { render json: @pages } 
    end 
    end 

    def show 
    respond_to do |format| 
     format.html # show.html.erb 
     format.json { render json: @page } 
    end 
    end 

    ... 

end 

Answer 1

它看起來像查詢找的是 '測試' 的ID的文件。你確定正確的參數被傳入顯示/編輯方法嗎？

這可能是您的觀點中的錯誤。

Answer 2

我只需要重寫模型的find方法，因爲這是CanCan正在調用的方法。

def self.find *args 
    if args.length == 1 and not args[0].is_a? Symbol 
    find_by_slug(*args) || super 
    else 
    super 
    end 
end 

Answer 3

另一種可能更好的方法是CanCan使用：find_by選項。

class PagesController < ApplicationController 
    load_and_authorize_resource :find_by => :slug 
    ... 
end