[英]ActiveRecord::ReadOnlyRecord: ActiveRecord::ReadOnlyRecord
[英]How can this code throw a ActiveRecord::ReadOnlyRecord exception?
我有其中采購模式has_one
優惠券 。
Purchase模型包含以下代碼:
def decrement_coupon
coupon = Coupon.find_by_code(coupon_code, :readonly => false)
return unless coupon.respond_to?(:uses)
coupon.uses = coupon.uses - 1
coupon.save
end
但是前幾天我收到了這個錯誤:
ActiveRecord::ReadOnlyRecord - ActiveRecord::ReadOnlyRecord:
/usr/local/rvm/gems/ree-1.8.7-2010.02@lyconic/gems/activerecord-3.0.6/lib/active_record/persistence.rb:245:in `create_or_update'
/usr/local/rvm/gems/ree-1.8.7-2010.02@lyconic/gems/activerecord-3.0.6/lib/active_record/callbacks.rb:273:in `create_or_update'
/usr/local/rvm/gems/ree-1.8.7-2010.02@lyconic/gems/activesupport-3.0.6/lib/active_support/callbacks.rb:419:in `_run_save_callbacks'
/usr/local/rvm/gems/ree-1.8.7-2010.02@lyconic/gems/activerecord-3.0.6/lib/active_record/callbacks.rb:273:in `create_or_update'
/usr/local/rvm/gems/ree-1.8.7-2010.02@lyconic/gems/activerecord-3.0.6/lib/active_record/persistence.rb:39:in `save'
/usr/local/rvm/gems/ree-1.8.7-2010.02@lyconic/gems/activerecord-3.0.6/lib/active_record/validations.rb:43:in `save'
/usr/local/rvm/gems/ree-1.8.7-2010.02@lyconic/gems/activerecord-3.0.6/lib/active_record/attribute_methods/dirty.rb:21:in `save'
/usr/local/rvm/gems/ree-1.8.7-2010.02@lyconic/gems/activerecord-3.0.6/lib/active_record/transactions.rb:240:in `save'
/usr/local/rvm/gems/ree-1.8.7-2010.02@lyconic/gems/activerecord-3.0.6/lib/active_record/transactions.rb:292:in `with_transaction_returning_status'
/usr/local/rvm/gems/ree-1.8.7-2010.02@lyconic/gems/activerecord-3.0.6/lib/active_record/connection_adapters/abstract/database_statements.rb:139:in `transaction'
/usr/local/rvm/gems/ree-1.8.7-2010.02@lyconic/gems/activerecord-3.0.6/lib/active_record/transactions.rb:207:in `transaction'
/usr/local/rvm/gems/ree-1.8.7-2010.02@lyconic/gems/activerecord-3.0.6/lib/active_record/transactions.rb:290:in `with_transaction_returning_status'
/usr/local/rvm/gems/ree-1.8.7-2010.02@lyconic/gems/activerecord-3.0.6/lib/active_record/transactions.rb:240:in `save'
/usr/local/rvm/gems/ree-1.8.7-2010.02@lyconic/gems/activerecord-3.0.6/lib/active_record/transactions.rb:251:in `rollback_active_record_state!'
/usr/local/rvm/gems/ree-1.8.7-2010.02@lyconic/gems/activerecord-3.0.6/lib/active_record/transactions.rb:239:in `save'
/usr/local/rvm/gems/ree-1.8.7-2010.02@lyconic/gems/activerecord-3.0.6/lib/active_record/associations/association_proxy.rb:222:in `send'
/usr/local/rvm/gems/ree-1.8.7-2010.02@lyconic/gems/activerecord-3.0.6/lib/active_record/associations/association_proxy.rb:222:in `method_missing'
/var/www/88tactical_production/releases/20110823232510/app/models/purchase.rb:69:in `decrement_coupon'
:readonly => false
不保證非讀取記錄嗎? 將此功能移至優惠券模型會有所作為嗎? (無論如何,我可能會這樣做)
這可能是由於您通過find_by_code()幫助程序加入其他子值。
當ActiveRecord使用連接查找返回其他值的對象時,它會將記錄標記為只讀。
這里有關於這個問題的詳細描述:
導致此ActiveRecord :: ReadOnlyRecord錯誤的原因是什么?
如果是這種情況,您可以通過將您的:join連接到一個正確的:include來填充ActiveRecord實例而不將它們標記為只讀來解決問題。
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