Ruby on rails 数组中的“每个”/“映射”偶尔会在“创建\时间\区域\转换\属性”中导致“您拥有一个非预期的零对象”

我有一个按钮，它通过XHR向rails服务器中的特定操作发送get请求。 此操作调用我在模型类别中定义的函数。此函数执行类似于x=Category.subcategories的操作，在下一行中执行类似于x.map&:id或x.each{x|y的操作，最终解决！ 发布后，在的帮助下，我可以确认一个有效的解决方案

问题：我使用require包含来自无表模型类的模型，这些类位于app/models中，但不扩展ActiveRecord:：Base。例如，我有一个执行require“category”的类FilterCategory。这会弄乱Rails的类缓存。 我必须首先使用require，因为Category.find:all等行都失败了

解决方案归功于trptcolin:replace Category.find:all with：：Category.find:all。这项工作无需明确要求任何模型，因此不会导致任何类缓存问题

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当使用config.active\u record.default\u timezone=：utc时，堆栈太深的问题也会消失。对，我有同样的问题，我的关系也被称为类别。这可能是命名问题吗？过去我的模型有一个名为kind的字段。Macario，我认为这不是命名问题。你有我需要的地方吗在你的应用程序中有一个不是从ActiveRecord:：Base派生的模型类？我想这是我的问题。我有一个FilterCategory类，它需要“category”，我想这会弄乱Rails的类缓存。

You have a nil object when you didn't expect it!
You might have expected an instance of Array.
The error occurred while evaluating nil.include?

C:/MyApp/vendor/rails/activerecord/lib/active_record/attribute_methods.rb:142:in `create_time_zone_conversion_attribute?'
C:/MyApp/vendor/rails/activerecord/lib/active_record/attribute_methods.rb:75:in `define_attribute_methods'
C:/MyApp/vendor/rails/activerecord/lib/active_record/attribute_methods.rb:71:in `each'
C:/MyApp/vendor/rails/activerecord/lib/active_record/attribute_methods.rb:71:in `define_attribute_methods'
C:/MyApp/vendor/rails/activerecord/lib/active_record/attribute_methods.rb:355:in `respond_to?'
C:/MyApp/vendor/rails/activerecord/lib/active_record/associations/association_proxy.rb:215:in `method_missing'
C:/MyApp/vendor/rails/activerecord/lib/active_record/associations/association_proxy.rb:215:in `map'
C:/MyApp/vendor/rails/activerecord/lib/active_record/associations/association_proxy.rb:215:in `send'
C:/MyApp/vendor/rails/activerecord/lib/active_record/associations/association_proxy.rb:215:in `method_missing'
C:/MyApp/vendor/rails/activerecord/lib/active_record/associations/association_collection.rb:369:in `method_missing'
C:/MyApp/app/models/category.rb:24:in `fetch_prices_grouped_by_date'
C:/MyApp/app/controllers/categories_controller.rb:103:in `show'

config.cache_classes = true

self.skip_time_zone_conversion_for_attributes = []

config.time_zone = 'UTC'

config.active_record.default_timezone = :utc

C:/MyApp/vendor/rails/activerecord/lib/active_record/attribute_methods.rb:237:in `method_missing'
C:/MyApp/vendor/rails/activerecord/lib/active_record/attribute_methods.rb:253:in `method_missing'
C:/MyApp/vendor/rails/activerecord/lib/active_record/attribute_methods.rb:211:in `to_proc'
C:/MyApp/vendor/rails/activerecord/lib/active_record/associations/association_collection.rb:369:in `method_missing'
C:/MyApp/vendor/rails/activerecord/lib/active_record/associations/association_proxy.rb:215:in `map'
C:/MyApp/vendor/rails/activerecord/lib/active_record/associations/association_proxy.rb:215:in `send'
C:/MyApp/vendor/rails/activerecord/lib/active_record/associations/association_proxy.rb:215:in `method_missing'
C:/MyApp/vendor/rails/activerecord/lib/active_record/associations/association_collection.rb:369:in `method_missing'
C:/MyApp/app/models/category.rb:24:in `fetch_prices_grouped_by_date'
C:/MyApp/app/controllers/categories_controller.rb:103:in `show'

if self.class.primary_key.to_s == method_name

if false and self.class.primary_key.to_s == method_name