ActiveRecords沒有調用正確的SQL語句

我有一個ActiveRecords奇怪的問題，我一直在努力幾天了。我仍然是一個初學者在軌道上，並希望在stackoverflow上的鐵軌大師之一可以告訴我我做錯了什麼。ActiveRecords沒有調用正確的SQL語句

我正在使用postgres服務器，並且在資源和評論之間有多對一的關係。我對我的控制器有一個操作，我通過ajax調用來檢索特定資源的所有註釋。我使用這個方法應該返回屬於某個特定resource_id的所有註釋。

def forresource 
resource_id = params[:id] 
@comments = Resource.find_by_id(resource_id).comments 
respond_to do |format| 
    format.html 
    format.json { render :status=>200, :json=>{:success=>true, :comments => @comments}} 
    end 
    end

但是，運行時，此方法似乎是使用comment_id搜索註釋。

有人可以告訴我我做錯了什麼嗎？我也試過這個命令。

@comments = Comment.where(:resource_id => resource_id)

這裏是簡寫模型關係

class Resource < ActiveRecord::Base 
    has_many :comments 
end 

class Comment < ActiveRecord::Base 
    attr_accessible :content, :resource_id, :user_id 
    belongs_to :user 
    belongs_to :resource 
    end

感謝您的幫助！我已經花了最後3天的時間在牆上試圖解決這個問題。

更新：下面是從我的錯誤堆棧跟蹤：

Started POST "/comments/30/forresource" for 127.0.0.1 at 2013-03-04 19:49:05 -0700 
Processing by CommentsController#forresource as JSON 
    Parameters: {"id"=>"30"} 
    Comment Load (0.4ms) SELECT "comments".* FROM "comments" WHERE "comments"."id" = $1 LIMIT 1 [["id", "30"]] 
Completed 404 Not Found in 10ms 

ActiveRecord::RecordNotFound - Couldn't find Comment with id=30: 
    (gem) activerecord-3.2.11/lib/active_record/relation/finder_methods.rb:341:in `find_one' 
    (gem) activerecord-3.2.11/lib/active_record/relation/finder_methods.rb:312:in `find_with_ids' 
    (gem) activerecord-3.2.11/lib/active_record/relation/finder_methods.rb:107:in `find' 
    (gem) activerecord-3.2.11/lib/active_record/querying.rb:5:in `find' 
    (gem) cancan-1.6.9/lib/cancan/model_adapters/abstract_adapter.rb:20:in `find' 
    (gem) cancan-1.6.9/lib/cancan/controller_resource.rb:114:in `find_resource' 
    (gem) cancan-1.6.9/lib/cancan/controller_resource.rb:68:in `load_resource_instance' 
    (gem) cancan-1.6.9/lib/cancan/controller_resource.rb:32:in `load_resource' 
    (gem) cancan-1.6.9/lib/cancan/controller_resource.rb:25:in `load_and_authorize_resource' 
    (gem) cancan-1.6.9/lib/cancan/controller_resource.rb:10:in `block in add_before_filter' 
    (gem) activesupport-3.2.11/lib/active_support/callbacks.rb:419:in `block in _run__1784171846094811992__process_action__3376091794244018521__callbacks' 
    (gem) activesupport-3.2.11/lib/active_support/callbacks.rb:215:in `block in _conditional_callback_around_709' 
    (gem) activesupport-3.2.11/lib/active_support/callbacks.rb:326:in `around' 
    (gem) activesupport-3.2.11/lib/active_support/callbacks.rb:310:in `_callback_around_137' 
    (gem) activesupport-3.2.11/lib/active_support/callbacks.rb:214:in `_conditional_callback_around_709' 
    (gem) activesupport-3.2.11/lib/active_support/callbacks.rb:414:in `_run__1784171846094811992__process_action__3376091794244018521__callbacks' 
    (gem) activesupport-3.2.11/lib/active_support/callbacks.rb:405:in `__run_callback' 
    (gem) activesupport-3.2.11/lib/active_support/callbacks.rb:385:in `_run_process_action_callbacks' 
    (gem) activesupport-3.2.11/lib/active_support/callbacks.rb:81:in `run_callbacks' 
    (gem) actionpack-3.2.11/lib/abstract_controller/callbacks.rb:17:in `process_action' 
    (gem) actionpack-3.2.11/lib/action_controller/metal/rescue.rb:29:in `process_action' 
    (gem) actionpack-3.2.11/lib/action_controller/metal/instrumentation.rb:30:in `block in process_action' 
    (gem) activesupport-3.2.11/lib/active_support/notifications.rb:123:in `block in instrument' 
    (gem) activesupport-3.2.11/lib/active_support/notifications/instrumenter.rb:20:in `instrument' 
    (gem) activesupport-3.2.11/lib/active_support/notifications.rb:123:in `instrument' 
    (gem) actionpack-3.2.11/lib/action_controller/metal/instrumentation.rb:29:in `process_action' 
    (gem) actionpack-3.2.11/lib/action_controller/metal/params_wrapper.rb:207:in `process_action' 
    (gem) activerecord-3.2.11/lib/active_record/railties/controller_runtime.rb:18:in `process_action' 
    (gem) actionpack-3.2.11/lib/abstract_controller/base.rb:121:in `process' 
    (gem) actionpack-3.2.11/lib/abstract_controller/rendering.rb:45:in `process' 
    (gem) actionpack-3.2.11/lib/action_controller/metal.rb:203:in `dispatch' 
    (gem) actionpack-3.2.11/lib/action_controller/metal/rack_delegation.rb:14:in `dispatch' 
    (gem) actionpack-3.2.11/lib/action_controller/metal.rb:246:in `block in action' 
    (gem) actionpack-3.2.11/lib/action_dispatch/routing/route_set.rb:73:in `dispatch' 
    (gem) actionpack-3.2.11/lib/action_dispatch/routing/route_set.rb:36:in `call' 
    (gem) journey-1.0.4/lib/journey/router.rb:68:in `block in call' 
    (gem) journey-1.0.4/lib/journey/router.rb:56:in `call' 
    (gem) actionpack-3.2.11/lib/action_dispatch/routing/route_set.rb:601:in `call' 
    (gem) meta_request-0.2.2/lib/meta_request/middlewares/app_request_handler.rb:11:in `call' 
    (gem) rack-contrib-1.1.0/lib/rack/contrib/response_headers.rb:17:in `call' 
    (gem) meta_request-0.2.2/lib/meta_request/middlewares/headers.rb:16:in `call' 
    (gem) meta_request-0.2.2/lib/meta_request/middlewares/meta_request_handler.rb:13:in `call' 
    (gem) omniauth-1.1.3/lib/omniauth/strategy.rb:177:in `call!' 
    (gem) omniauth-1.1.3/lib/omniauth/strategy.rb:157:in `call' 
    (gem) omniauth-1.1.3/lib/omniauth/builder.rb:48:in `call' 
    (gem) warden-1.2.1/lib/warden/manager.rb:35:in `block in call' 
    (gem) warden-1.2.1/lib/warden/manager.rb:34:in `call' 
    (gem) actionpack-3.2.11/lib/action_dispatch/middleware/best_standards_support.rb:17:in `call' 
    (gem) rack-1.4.5/lib/rack/etag.rb:23:in `call' 
    (gem) rack-1.4.5/lib/rack/conditionalget.rb:35:in `call' 
    (gem) actionpack-3.2.11/lib/action_dispatch/middleware/head.rb:14:in `call' 
    (gem) actionpack-3.2.11/lib/action_dispatch/middleware/params_parser.rb:21:in `call' 
    (gem) actionpack-3.2.11/lib/action_dispatch/middleware/flash.rb:242:in `call' 
    (gem) rack-1.4.5/lib/rack/session/abstract/id.rb:210:in `context' 
    (gem) rack-1.4.5/lib/rack/session/abstract/id.rb:205:in `call' 
    (gem) actionpack-3.2.11/lib/action_dispatch/middleware/cookies.rb:341:in `call' 
    (gem) activerecord-3.2.11/lib/active_record/query_cache.rb:64:in `call' 
    (gem) activerecord-3.2.11/lib/active_record/connection_adapters/abstract/connection_pool.rb:479:in `call' 
    (gem) actionpack-3.2.11/lib/action_dispatch/middleware/callbacks.rb:28:in `block in call' 
    (gem) activesupport-3.2.11/lib/active_support/callbacks.rb:405:in `_run__1798271562887333581__call__3889604659297230264__callbacks' 
    (gem) activesupport-3.2.11/lib/active_support/callbacks.rb:405:in `__run_callback' 
    (gem) activesupport-3.2.11/lib/active_support/callbacks.rb:385:in `_run_call_callbacks' 
    (gem) activesupport-3.2.11/lib/active_support/callbacks.rb:81:in `run_callbacks' 
    (gem) actionpack-3.2.11/lib/action_dispatch/middleware/callbacks.rb:27:in `call' 
    (gem) actionpack-3.2.11/lib/action_dispatch/middleware/reloader.rb:65:in `call' 
    (gem) actionpack-3.2.11/lib/action_dispatch/middleware/remote_ip.rb:31:in `call' 
    (gem) better_errors-0.7.0/lib/better_errors/middleware.rb:84:in `protected_app_call' 
    (gem) better_errors-0.7.0/lib/better_errors/middleware.rb:79:in `better_errors_call' 
    (gem) better_errors-0.7.0/lib/better_errors/middleware.rb:56:in `call' 
    (gem) actionpack-3.2.11/lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call' 
    (gem) actionpack-3.2.11/lib/action_dispatch/middleware/show_exceptions.rb:56:in `call' 
    (gem) railties-3.2.11/lib/rails/rack/logger.rb:32:in `call_app' 
    (gem) railties-3.2.11/lib/rails/rack/logger.rb:16:in `block in call' 
    (gem) activesupport-3.2.11/lib/active_support/tagged_logging.rb:22:in `tagged' 
    (gem) railties-3.2.11/lib/rails/rack/logger.rb:16:in `call' 
    (gem) actionpack-3.2.11/lib/action_dispatch/middleware/request_id.rb:22:in `call' 
    (gem) rack-1.4.5/lib/rack/methodoverride.rb:21:in `call' 
    (gem) rack-1.4.5/lib/rack/runtime.rb:17:in `call' 
    (gem) activesupport-3.2.11/lib/active_support/cache/strategy/local_cache.rb:72:in `call' 
    (gem) rack-1.4.5/lib/rack/lock.rb:15:in `call' 
    (gem) actionpack-3.2.11/lib/action_dispatch/middleware/static.rb:62:in `call' 
    (gem) railties-3.2.11/lib/rails/engine.rb:479:in `call' 
    (gem) railties-3.2.11/lib/rails/application.rb:223:in `call' 
    (gem) rack-1.4.5/lib/rack/content_length.rb:14:in `call' 
    (gem) railties-3.2.11/lib/rails/rack/log_tailer.rb:17:in `call' 
    (gem) rack-1.4.5/lib/rack/handler/webrick.rb:59:in `service'

來源

2013-03-05 android_student

您是使用InheritedResources還是嘗試自動爲您加載評論的類似內容？我懷疑你的代碼甚至沒有被達到，你可以通過查看錯誤堆棧跟蹤來確認。 – 2013-03-05 03:12:02

我和丹在這裏。你可能使用康康？ – jvnill 2013-03-05 03:19:07

是的，我們使用cancan 1.6.7。康燦如何使這變得複雜？ – 2013-03-05 03:25:45

你提到使用慘慘的作品，是你可能使用load_and_authorize_resource或load_resource？如果是這樣，您需要從這個控制器中排除這些操作，以便CanCan不會嘗試從您的資源豐富的路由中加載註釋。或者，您可以更改路由，以便資源具有路由方式的「內部」註釋。

後一種方法是在您的方案中最乾淨，機智的路線通常會有/ resources /：resource_id/comments。

來源

2013-03-05 03:34:30

非常感謝！ – 2013-03-05 03:46:02

你是否通靈？就是這樣。謝謝！ – 2013-03-05 03:46:39

我已經試過：

class Resource < ActiveRecord::Base 
    has_many :comments 
end 

class Comment < ActiveRecord::Base 
    attr_accessible :content, :resource_id, :user_id 
    belongs_to :user 
    belongs_to :resource 
end

，並如預期

1.9.3-p392 :026 > Comment.where(:resource_id => resource_id).to_sql 
=> "SELECT `comments`.* FROM `comments` WHERE `comments`.`resource_id` = 5" 

1.9.3-p392 :028 > Resource.where(id: 1).first.comments.to_sql 
Resource Load (1.9ms) SELECT `resources`.* FROM `resources` WHERE `resources`.`id` = 1 LIMIT 1 
=> "SELECT `comments`.* FROM `comments` WHERE `comments`.`resource_id` = 1"

來源

2013-03-05 03:13:34 rorra

對不對？我不明白爲什麼它不適合我們！這就像Rails神們在嘲笑我們 – 2013-03-05 03:27:50

ActiveRecords沒有調用正確的SQL語句

回答

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