如何在Rails的多态has_one关联中禁用计数器缓存？

Question

I'm needing to disable counter cache for has_one associations as below and keep it just on has_many:

class User < ActiveRecord::Base
  has_one :email, as: :emailable
end

class Company < ActiveRecord::Base
  has_many :emails, as: :emailable
end

class Email < ActiveRecord::Base
  belongs_to :emailable, polymorphic: true, counter_cache: emails_count
end

I don't have a emails_count column on User model. Any ideas?

Thanks for your help!

Answer 1

如果未指定counter_cache选项，则不应有任何计数器缓存，如果由于某种原因无论您是否进行缓存，都可以尝试强制使用counter_cache: false