Railsのモデル＃新しいアクションでUndefinedMethodは

Question

私のroutes.rbをのようなを探しますOrdersController＃新しい

未定義のメソッド `build_orderでNoMethodError「＃

のフルスタックトレースのためのようなある：

activemodel (4.2.5) lib/active_model/attribute_methods.rb:433:in      `method_missing' 
app/controllers/orders_controller.rb:29:in `new' 
actionpack (4.2.5)  lib/action_controller/metal/implicit_render.rb:4:in `send_action' 
actionpack (4.2.5) lib/abstract_controller/base.rb:198:in ` process_action' 
actionpack (4.2.5) lib/action_controller/metal/rendering.rb:10:in `process_action' 
actionpack (4.2.5) lib/abstract_controller/callbacks.rb:20:in `block in process_action' 
activesupport (4.2.5) lib/active_support/callbacks.rb:117:in `call' 
activesupport (4.2.5) lib/active_support/callbacks.rb:117:in `call' 
activesupport (4.2.5) lib/active_support/callbacks.rb:555:in `block (2 levels) in compile' 
activesupport (4.2.5) lib/active_support/callbacks.rb:505:in `call' 
activesupport (4.2.5) lib/active_support/callbacks.rb:505:in `call' 
activesupport (4.2.5) lib/active_support/callbacks.rb:92:in  `__run_callbacks__' 
activesupport (4.2.5) lib/active_support/callbacks.rb:778:in  `_run_process_action_callbacks' 
activesupport (4.2.5) lib/active_support/callbacks.rb:81:in `run_callbacks' 
actionpack (4.2.5) lib/abstract_controller/callbacks.rb:19:in `process_action' 
actionpack (4.2.5) lib/action_controller/metal/rescue.rb:29:in `process_action' 
actionpack (4.2.5)  lib/action_controller/metal/instrumentation.rb:32:in `block in process_action' 
activesupport (4.2.5) lib/active_support/notifications.rb:164:in `block in instrument' 
activesupport (4.2.5) lib/active_support/notifications/instrumenter.rb:20:in `instrument' 
activesupport (4.2.5) lib/active_support/notifications.rb:164:in `instrument' 
actionpack (4.2.5) lib/action_controller/metal/instrumentation.rb:30:in `process_action' 
actionpack (4.2.5) lib/action_controller/metal/params_wrapper.rb:250:in `process_action' 
activerecord (4.2.5) lib/active_record/railties/controller_runtime.rb:18:in `process_action' 
actionpack (4.2.5) lib/abstract_controller/base.rb:137:in `process' 
actionview (4.2.5) lib/action_view/rendering.rb:30:in `process' 
actionpack (4.2.5) lib/action_controller/metal.rb:196:in `dispatch' 
actionpack (4.2.5) lib/action_controller/metal/rack_delegation.rb:13:in `dispatch' 
actionpack (4.2.5) lib/action_controller/metal.rb:237:in `block in action' 
actionpack (4.2.5) lib/action_dispatch/routing/route_set.rb:76:in `call' 
actionpack (4.2.5) lib/action_dispatch/routing/route_set.rb:76:in `dispatch' 
actionpack (4.2.5) lib/action_dispatch/routing/route_set.rb:45:in `serve' 
actionpack (4.2.5) lib/action_dispatch/journey/router.rb:43:in `block in serve' 
actionpack (4.2.5) lib/action_dispatch/journey/router.rb:30:in `each' 
actionpack (4.2.5) lib/action_dispatch/journey/router.rb:30:in `serve' 
actionpack (4.2.5) lib/action_dispatch/routing/route_set.rb:817:in `call' 
rack (1.6.4) lib/rack/etag.rb:24:in `call' 
rack (1.6.4) lib/rack/conditionalget.rb:25:in `call' 
rack (1.6.4) lib/rack/head.rb:13:in `call' 
actionpack (4.2.5) lib/action_dispatch/middleware/params_parser.rb:27:in `call' 
actionpack (4.2.5) lib/action_dispatch/middleware/flash.rb:260:in `call' 
rack (1.6.4) lib/rack/session/abstract/id.rb:225:in `context' 
rack (1.6.4) lib/rack/session/abstract/id.rb:220:in `call' 
actionpack (4.2.5) lib/action_dispatch/middleware/cookies.rb:560:in `call' 
activerecord (4.2.5) lib/active_record/query_cache.rb:36:in `call' 
activerecord (4.2.5) lib/active_record/connection_adapters/abstract/connection_pool.rb:653:in `call' 
activerecord (4.2.5) lib/active_record/migration.rb:377:in `call' 
actionpack (4.2.5) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call' 
activesupport (4.2.5) lib/active_support/callbacks.rb:88:in  `__run_callbacks__' 
activesupport (4.2.5) lib/active_support/callbacks.rb:778:in  `_run_call_callbacks' 
activesupport (4.2.5) lib/active_support/callbacks.rb:81:in  `run_callbacks' 
actionpack (4.2.5) lib/action_dispatch/middleware/callbacks.rb:27:in `call' 
actionpack (4.2.5) lib/action_dispatch/middleware/reloader.rb:73:in `call' 
actionpack (4.2.5) lib/action_dispatch/middleware/remote_ip.rb:78:in `call' 
actionpack (4.2.5)    lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call' 
web-console (2.3.0) lib/web_console/middleware.rb:28:in `block in call' 
web-console (2.3.0) lib/web_console/middleware.rb:18:in `catch' 
web-console (2.3.0) lib/web_console/middleware.rb:18:in `call' 
actionpack (4.2.5)  lib/action_dispatch/middleware/show_exceptions.rb:30:in `call' 
railties (4.2.5) lib/rails/rack/logger.rb:38:in `call_app' 
railties (4.2.5) lib/rails/rack/logger.rb:20:in `block in call' 
activesupport (4.2.5) lib/active_support/tagged_logging.rb:68:in `block in tagged' 
activesupport (4.2.5) lib/active_support/tagged_logging.rb:26:in `tagged' 
activesupport (4.2.5) lib/active_support/tagged_logging.rb:68:in `tagged' 
railties (4.2.5) lib/rails/rack/logger.rb:20:in `call' 
actionpack (4.2.5) lib/action_dispatch/middleware/request_id.rb:21:in `call' 
rack (1.6.4) lib/rack/methodoverride.rb:22:in `call' 
rack (1.6.4) lib/rack/runtime.rb:18:in `call' 
activesupport (4.2.5)  lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call' 
rack (1.6.4) lib/rack/lock.rb:17:in `call' 
actionpack (4.2.5) lib/action_dispatch/middleware/static.rb:116:in `call' 
rack (1.6.4) lib/rack/sendfile.rb:113:in `call' 
railties (4.2.5) lib/rails/engine.rb:518:in `call' 
railties (4.2.5) lib/rails/application.rb:165:in `call' 
rack (1.6.4) lib/rack/content_length.rb:15:in `call' 
puma (3.1.0) lib/puma/configuration.rb:227:in `call' 
puma (3.1.0) lib/puma/server.rb:561:in `handle_request' 
puma (3.1.0) lib/puma/server.rb:406:in `process_client' 
puma (3.1.0) lib/puma/server.rb:271:in `block in run' 
puma (3.1.0) lib/puma/thread_pool.rb:111:in `call' 
puma (3.1.0) lib/puma/thread_pool.rb:111:in `block in spawn_thread' 

私は何も存在しない場合に、予約や注文を行うことができるよ」は、私が問題に遭遇しているところは、ユーザーがサインインしているときです。予約をしてDBに保存しますが、Orders＃new controller @order = @ user.build_order行。私は@ user.order.new、@ user.order.buildなど多くのバリエーションを試しました。

@order = @ user.reservations.order（params [：reservation_id]）でも試してみましたが、 _formの注文のための 'to_key'問題への私。

私が言及したオプションや、私がもう覚えていないものを試したオプションはありません。私は大いに助けに感謝します。

より多くの情報が必要な場合は教えてください。可能な限り早急に投稿してください。

Answer 1

@user.build_orderから@user.orders.buildに変更してください。

前者は、所有オブジェクトを指すbelongs_toの関連付けに使用されます。

後者は、has_manyスタイル関連コレクションをポイント、すなわちするためのものです。 "このユーザーの注文に基づいて構築する"あなたの代わりに、ユーザー自身に注文のユーザのコレクションにbuildを呼び出すよう

ユーザーは、注文（has_many協会）のコレクションを持っています。

Answer 2

お客様のUserhas_many :ordersです。 @user.build_orderは、Userにhas_one :orderまたはbelongs_to :orderがある場合にのみ機能します。

Userhas_many :ordersとしてOrdersController#newに@user.orders.buildを使用してください。

リレーションを構築する方法の詳細については、ActiveRecord::Associationsを参照してください。