未初始化不斷使用多態關聯

-1

Category.first.translations

Rails的版本：5.1.3

的Ruby版本：2.3.3

型號：

# app/models/translation.rb 
class Translation < ApplicationRecord 
    belongs_to :translatable, polymorphic: true 
end 

# app/models/category.rb 
class Category < ApplicationRecord 
    has_many :translations, :as => :translatable 
end

遷移：

class CreateTranslations < ActiveRecord::Migration[5.1] 
    def change 
    create_table :translations do |t| 
     t.string :locale 
     t.string :key 
     t.text :value 
     t.text :interpolations 
     t.boolean :is_proc, default: false 

     t.references :translatable, polymorphic: true, index: true 

     t.timestamps 
    end 
    end 
end

schema.rb：

create_table "translations", force: :cascade do |t| 
    t.string "locale" 
    t.string "key" 
    t.text "value" 
    t.text "interpolations" 
    t.boolean "is_proc", default: false 
    t.string "translatable_type" 
    t.integer "translatable_id" 
    t.datetime "created_at", null: false 
    t.datetime "updated_at", null: false 
    t.index ["translatable_type", "translatable_id"], name: "index_translations_on_translatable_type_and_translatable_id" 
end

完全跟蹤：

activerecord (5.1.3) lib/active_record/inheritance.rb:166:in `compute_type' 
activerecord (5.1.3) lib/active_record/reflection.rb:401:in `compute_class' 
activerecord (5.1.3) lib/active_record/reflection.rb:397:in `klass' 
activerecord (5.1.3) lib/active_record/associations/association.rb:127:in `klass' 
activerecord (5.1.3) lib/active_record/associations/collection_association.rb:33:in `reader' 
activerecord (5.1.3) lib/active_record/associations/builder/association.rb:111:in `translations' 
app/controllers/categories_controller.rb:27:in `new' 
actionpack (5.1.3) lib/action_controller/metal/basic_implicit_render.rb:4:in `send_action' 
actionpack (5.1.3) lib/abstract_controller/base.rb:186:in `process_action' 
actionpack (5.1.3) lib/action_controller/metal/rendering.rb:30:in `process_action' 
actionpack (5.1.3) lib/abstract_controller/callbacks.rb:20:in `block in process_action' 
activesupport (5.1.3) lib/active_support/callbacks.rb:131:in `run_callbacks' 
actionpack (5.1.3) lib/abstract_controller/callbacks.rb:19:in `process_action' 
actionpack (5.1.3) lib/action_controller/metal/rescue.rb:20:in `process_action' 
actionpack (5.1.3) lib/action_controller/metal/instrumentation.rb:32:in `block in process_action' 
activesupport (5.1.3) lib/active_support/notifications.rb:166:in `block in instrument' 
activesupport (5.1.3) lib/active_support/notifications/instrumenter.rb:21:in `instrument' 
activesupport (5.1.3) lib/active_support/notifications.rb:166:in `instrument' 
actionpack (5.1.3) lib/action_controller/metal/instrumentation.rb:30:in `process_action' 
actionpack (5.1.3) lib/action_controller/metal/params_wrapper.rb:252:in `process_action' 
activerecord (5.1.3) lib/active_record/railties/controller_runtime.rb:22:in `process_action' 
actionpack (5.1.3) lib/abstract_controller/base.rb:124:in `process' 
actionview (5.1.3) lib/action_view/rendering.rb:30:in `process' 
actionpack (5.1.3) lib/action_controller/metal.rb:189:in `dispatch' 
actionpack (5.1.3) lib/action_controller/metal.rb:253:in `dispatch' 
actionpack (5.1.3) lib/action_dispatch/routing/route_set.rb:49:in `dispatch' 
actionpack (5.1.3) lib/action_dispatch/routing/route_set.rb:31:in `serve' 
actionpack (5.1.3) lib/action_dispatch/journey/router.rb:46:in `block in serve' 
actionpack (5.1.3) lib/action_dispatch/journey/router.rb:33:in `each' 
actionpack (5.1.3) lib/action_dispatch/journey/router.rb:33:in `serve' 
actionpack (5.1.3) lib/action_dispatch/routing/route_set.rb:834:in `call' 
omniauth (1.6.1) lib/omniauth/strategy.rb:189:in `call!' 
omniauth (1.6.1) lib/omniauth/strategy.rb:167:in `call' 
omniauth (1.6.1) lib/omniauth/strategy.rb:189:in `call!' 
omniauth (1.6.1) lib/omniauth/strategy.rb:167:in `call' 
omniauth (1.6.1) lib/omniauth/builder.rb:63:in `call' 
rack (2.0.3) lib/rack/etag.rb:25:in `call' 
rack (2.0.3) lib/rack/conditional_get.rb:25:in `call' 
rack (2.0.3) lib/rack/head.rb:12:in `call' 
rack (2.0.3) lib/rack/session/abstract/id.rb:232:in `context' 
rack (2.0.3) lib/rack/session/abstract/id.rb:226:in `call' 
actionpack (5.1.3) lib/action_dispatch/middleware/cookies.rb:613:in `call' 
activerecord (5.1.3) lib/active_record/migration.rb:556:in `call' 
actionpack (5.1.3) lib/action_dispatch/middleware/callbacks.rb:26:in `block in call' 
activesupport (5.1.3) lib/active_support/callbacks.rb:97:in `run_callbacks' 
actionpack (5.1.3) lib/action_dispatch/middleware/callbacks.rb:24:in `call' 
actionpack (5.1.3) lib/action_dispatch/middleware/executor.rb:12:in `call' 
actionpack (5.1.3) lib/action_dispatch/middleware/debug_exceptions.rb:59:in `call' 
web-console (3.5.1) lib/web_console/middleware.rb:135:in `call_app' 
web-console (3.5.1) lib/web_console/middleware.rb:28:in `block in call' 
web-console (3.5.1) lib/web_console/middleware.rb:18:in `catch' 
web-console (3.5.1) lib/web_console/middleware.rb:18:in `call' 
actionpack (5.1.3) lib/action_dispatch/middleware/show_exceptions.rb:31:in `call' 
railties (5.1.3) lib/rails/rack/logger.rb:36:in `call_app' 
railties (5.1.3) lib/rails/rack/logger.rb:24:in `block in call' 
activesupport (5.1.3) lib/active_support/tagged_logging.rb:69:in `block in tagged' 
activesupport (5.1.3) lib/active_support/tagged_logging.rb:26:in `tagged' 
activesupport (5.1.3) lib/active_support/tagged_logging.rb:69:in `tagged' 
railties (5.1.3) lib/rails/rack/logger.rb:24:in `call' 
sprockets-rails (3.2.0) lib/sprockets/rails/quiet_assets.rb:13:in `call' 
actionpack (5.1.3) lib/action_dispatch/middleware/remote_ip.rb:79:in `call' 
actionpack (5.1.3) lib/action_dispatch/middleware/request_id.rb:25:in `call' 
rack (2.0.3) lib/rack/method_override.rb:22:in `call' 
rack (2.0.3) lib/rack/runtime.rb:22:in `call' 
activesupport (5.1.3) lib/active_support/cache/strategy/local_cache_middleware.rb:27:in `call' 
actionpack (5.1.3) lib/action_dispatch/middleware/executor.rb:12:in `call' 
actionpack (5.1.3) lib/action_dispatch/middleware/static.rb:125:in `call' 
rack (2.0.3) lib/rack/sendfile.rb:111:in `call' 
railties (5.1.3) lib/rails/engine.rb:522:in `call' 
puma (3.9.1) lib/puma/configuration.rb:224:in `call' 
puma (3.9.1) lib/puma/server.rb:602:in `handle_request' 
puma (3.9.1) lib/puma/server.rb:435:in `process_client' 
puma (3.9.1) lib/puma/server.rb:299:in `block in run' 
puma (3.9.1) lib/puma/thread_pool.rb:120:in `block in spawn_thread'

我對這個錯誤是由配置錯誤的關聯設定引起了衆多網站（主要是錯別字）閱讀。我也嘗試在Category類中設置：classname =>'Translation'，但那也沒有幫助。我一整天都無法確定問題，所以我在這裏尋求幫助。

謝謝！

來源

2017-08-30 Martin Pohorský

「翻譯」模型的文件名是什麼？ – Pavan

translation.rb。它是自動生成的： - /。 –

@MartinPohorský** translation.rb **和** category.rb **的文件路徑是什麼？此外，當你執行'Category.first.translations'時你能顯示完整的錯誤回溯嗎？ –

我解決了！這與模型直接無關。 @MYYoshiji指出我正確的方向。

我使用I18n gem和i18n-active_record，因此我可以將翻譯存儲在數據庫中。

在初始化的Rails加載此代碼：

Translation = I18n::Backend::ActiveRecord::Translation

翻譯模型是真實的I18n ::後端的ActiveRecord :: ::翻譯模型。因此，在我的翻譯模型變化了沒有效果，因爲這個名字是有聯繫的另一種模式..

我改變了應用程序/模型/ translation.rb這樣：

class Translation < I18n::Backend::ActiveRecord::Translation 
    belongs_to :translatable, polymorphic: true 
end

或刪除線從上述組態。

無論如何，非常感謝您的意見！

來源

2017-08-30 17:31:35

未初始化不斷使用多態關聯

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