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我正在使用friendly_id gem生成slu。。無法訪問關聯的只讀模型的屬性
我有這樣
class Veterinarian < ApplicationRecord
extend FriendlyId
belongs_to :user
has_one :profile, through: :user
friendly_id :slug_string, use: :slugged
def slug_string
"#{profile.first_name} #{profile.last_name} #{profile.city}"
end
end
一個模型，像這樣的另一種模式。
class Profile < ApplicationRecord
include ReadOnlyModel
belongs_to :user
end
ReadOnlyModel看起來，當我試圖訪問的個人資料這樣
module ReadOnlyModel
extend ActiveSupport::Concern
included do
attr_readonly(*column_names)
end
def readonly?
true
end
def destroy
raise ActiveRecord::ReadOnlyRecord
end
def delete
raise ActiveRecord::ReadOnlyRecord
end
end
我的問題而來的獸醫模型的內部屬性。 profile.first_name，profile.last_name等
當friendly_id嘗試更新蛞蝓，它拋出一個錯誤告訴我，剖面模型是隻讀的，但我只是訪問屬性，並用它來創建friendly_id一個字符串使用，在配置文件模型中沒有任何變化。不過，我可以在控制檯中輸入Veterinarian.last.slug_string，並且輸出正確無誤。
我正在測試這個做Veterinarian.update(slug: nil)將slug設置爲零，並觸發friendly_id用適當的slug更新它。
我一直在撓我的腦袋好一個小時，一直未能弄清楚發生了什麼事情。這可能很簡單，我可以忽略。任何幫助，將不勝感激。
我上面的模型被包裝在一個獸醫模塊中，爲了便於閱讀，我在代碼示例中刪除了它。
activerecord (5.0.0.beta3) lib/active_record/persistence.rb:533:in `create_or_update'
activerecord (5.0.0.beta3) lib/active_record/callbacks.rb:298:in `block in create_or_update'
activesupport (5.0.0.beta3) lib/active_support/callbacks.rb:126:in `call'
activesupport (5.0.0.beta3) lib/active_support/callbacks.rb:506:in `block (2 levels) in compile'
activesupport (5.0.0.beta3) lib/active_support/callbacks.rb:455:in `call'
activesupport (5.0.0.beta3) lib/active_support/callbacks.rb:101:in `__run_callbacks__'
activesupport (5.0.0.beta3) lib/active_support/callbacks.rb:750:in `_run_save_callbacks'
activerecord (5.0.0.beta3) lib/active_record/callbacks.rb:298:in `create_or_update'
activerecord (5.0.0.beta3) lib/active_record/suppressor.rb:41:in `create_or_update'
activerecord (5.0.0.beta3) lib/active_record/persistence.rb:125:in `save'
activerecord (5.0.0.beta3) lib/active_record/validations.rb:44:in `save'
activerecord (5.0.0.beta3) lib/active_record/attribute_methods/dirty.rb:22:in `save'
activerecord (5.0.0.beta3) lib/active_record/transactions.rb:319:in `block (2 levels) in save'
activerecord (5.0.0.beta3) lib/active_record/transactions.rb:395:in `block in with_transaction_returning_status'
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activerecord (5.0.0.beta3) lib/active_record/transactions.rb:211:in `transaction'
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activerecord (5.0.0.beta3) lib/active_record/transactions.rb:319:in `block in save'
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activerecord (5.0.0.beta3) lib/active_record/transactions.rb:318:in `save'
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activerecord (5.0.0.beta3) lib/active_record/transactions.rb:395:in `block in with_transaction_returning_status'
activerecord (5.0.0.beta3) lib/active_record/connection_adapters/abstract/database_statements.rb:230:in `block in transaction'
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activerecord (5.0.0.beta3) lib/active_record/transactions.rb:211:in `transaction'
activerecord (5.0.0.beta3) lib/active_record/transactions.rb:392:in `with_transaction_returning_status'
activerecord (5.0.0.beta3) lib/active_record/persistence.rb:264:in `update'
engines/practices/app/controllers/practices/clinic_veterinarians_controller.rb:13:in `show'
actionpack (5.0.0.beta3) lib/action_controller/metal/basic_implicit_render.rb:4:in `send_action'
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actionpack (5.0.0.beta3) lib/abstract_controller/callbacks.rb:20:in `block in process_action'
activesupport (5.0.0.beta3) lib/active_support/callbacks.rb:126:in `call'
activesupport (5.0.0.beta3) lib/active_support/callbacks.rb:506:in `block (2 levels) in compile'
activesupport (5.0.0.beta3) lib/active_support/callbacks.rb:455:in `call'
activesupport (5.0.0.beta3) lib/active_support/callbacks.rb:101:in `__run_callbacks__'
activesupport (5.0.0.beta3) lib/active_support/callbacks.rb:750:in `_run_process_action_callbacks'
activesupport (5.0.0.beta3) lib/active_support/callbacks.rb:90:in `run_callbacks'
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actionpack (5.0.0.beta3) lib/action_controller/metal/params_wrapper.rb:248:in `process_action'
activerecord (5.0.0.beta3) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
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railties (5.0.0.beta3) lib/rails/engine.rb:522:in `call'
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actionpack (5.0.0.beta3) lib/action_dispatch/journey/router.rb:26:in `serve'
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omniauth (1.3.0) lib/omniauth/strategy.rb:186:in `call!'
omniauth (1.3.0) lib/omniauth/strategy.rb:164:in `call'
omniauth (1.3.0) lib/omniauth/strategy.rb:186:in `call!'
omniauth (1.3.0) lib/omniauth/strategy.rb:164:in `call'
omniauth (1.3.0) lib/omniauth/strategy.rb:186:in `call!'
omniauth (1.3.0) lib/omniauth/strategy.rb:164:in `call'
actionview (5.0.0.beta3) lib/action_view/digestor.rb:12:in `call'
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warden (1.2.6) lib/warden/manager.rb:35:in `block in call'
warden (1.2.6) lib/warden/manager.rb:34:in `catch'
warden (1.2.6) lib/warden/manager.rb:34:in `call'
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/Users/mike/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/bundler/gems/rack-1aded61cedb0/lib/rack/conditional_get.rb:25:in `call'
/Users/mike/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/bundler/gems/rack-1aded61cedb0/lib/rack/head.rb:12:in `call'
/Users/mike/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/bundler/gems/rack-1aded61cedb0/lib/rack/session/abstract/id.rb:222:in `context'
/Users/mike/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/bundler/gems/rack-1aded61cedb0/lib/rack/session/abstract/id.rb:216:in `call'
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actionpack (5.0.0.beta3) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
activesupport (5.0.0.beta3) lib/active_support/callbacks.rb:97:in `__run_callbacks__'
activesupport (5.0.0.beta3) lib/active_support/callbacks.rb:750:in `_run_call_callbacks'
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railties (5.0.0.beta3) lib/rails/rack/logger.rb:36:in `call_app'
railties (5.0.0.beta3) lib/rails/rack/logger.rb:24:in `block in call'
activesupport (5.0.0.beta3) lib/active_support/tagged_logging.rb:70:in `block in tagged'
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actionpack (5.0.0.beta3) lib/action_dispatch/middleware/request_id.rb:24:in `call'
/Users/mike/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/bundler/gems/rack-1aded61cedb0/lib/rack/method_override.rb:22:in `call'
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puma (2.16.0) lib/puma/server.rb:557:in `handle_request'
puma (2.16.0) lib/puma/server.rb:404:in `process_client'
puma (2.16.0) lib/puma/server.rb:270:in `block in run'
puma (2.16.0) lib/puma/thread_pool.rb:106:in `block in spawn_thread'
當遇到錯誤時包括堆棧跟蹤會有所幫助。 – Dharam
@Dharam Stacktrace添加。 – Mike
是所有的堆棧跟蹤？它沒有提供很多信息，因爲它不顯示這些調用的起源地點？ – Dharam