我有两个非常简单的类：
class Contact
include Mongoid::Document
has_and_belongs_to_many :organizations, :class_name => 'Organization'
end
和
class Organization
include Mongoid::Document
has_and_belongs_to_many :relations, :class_name => 'Contact'
end
这是验证/保存时的错误日志：
>> org = Organization.new
#<Organization _id: 5228ae3c1d41c8678c000001, relation_ids: nil, _type: "Organization">
>> org.valid?
org.valid?
NoMethodError: undefined method `has_key?' for #<Mongoid::Criteria:0x00000008d32bd0>
from /home/muichkine/.rvm/gems/ruby-2.0.0-p247/bundler/gems/mongoid-38de2e96edc8/lib/mongoid/criteria.rb:501:in `method_missing'
from /home/muichkine/.rvm/gems/ruby-2.0.0-p247/bundler/gems/mongoid-38de2e96edc8/lib/mongoid/relations/referenced/many.rb:413:in `block in method_missing'
from /home/muichkine/.rvm/gems/ruby-2.0.0-p247/bundler/gems/mongoid-38de2e96edc8/lib/mongoid/scopable.rb:238:in `with_scope'
from /home/muichkine/.rvm/gems/ruby-2.0.0-p247/bundler/gems/mongoid-38de2e96edc8/lib/mongoid/relations/referenced/many.rb:412:in `method_missing'
from /home/muichkine/.rvm/gems/ruby-2.0.0-p247/bundler/gems/mongoid-38de2e96edc8/lib/mongoid/validatable.rb:72:in `read_attribute_for_validation'
from /home/muichkine/.rvm/gems/ruby-2.0.0-p247/gems/activemodel-4.0.0/lib/active_model/validator.rb:151:in `block in validate'
from /home/muichkine/.rvm/gems/ruby-2.0.0-p247/gems/activemodel-4.0.0/lib/active_model/validator.rb:150:in `each'
from /home/muichkine/.rvm/gems/ruby-2.0.0-p247/gems/activemodel-4.0.0/lib/active_model/validator.rb:150:in `validate'
from /home/muichkine/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.0.0/lib/active_support/callbacks.rb:283:in `_callback_before_145'
from /home/muichkine/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.0.0/lib/active_support/callbacks.rb:377:in `_run__4324115989737504907__validate__callbacks'
from /home/muichkine/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.0.0/lib/active_support/callbacks.rb:80:in `run_callbacks'
from /home/muichkine/.rvm/gems/ruby-2.0.0-p247/bundler/gems/mongoid-38de2e96edc8/lib/mongoid/interceptable.rb:132:in `run_callbacks'
from /home/muichkine/.rvm/gems/ruby-2.0.0-p247/gems/activemodel-4.0.0/lib/active_model/validations.rb:373:in `run_validations!'
from /home/muichkine/.rvm/gems/ruby-2.0.0-p247/gems/activemodel-4.0.0/lib/active_model/validations/callbacks.rb:106:in `block in run_validations!'
from /home/muichkine/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.0.0/lib/active_support/callbacks.rb:373:in `_run__4324115989737504907__validation__callbacks'
from /home/muichkine/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.0.0/lib/active_support/callbacks.rb:80:in `run_callbacks'
from /home/muichkine/.rvm/gems/ruby-2.0.0-p247/bundler/gems/mongoid-38de2e96edc8/lib/mongoid/interceptable.rb:132:in `run_callbacks'
from /home/muichkine/.rvm/gems/ruby-2.0.0-p247/gems/activemodel-4.0.0/lib/active_model/validations/callbacks.rb:106:in `run_validations!'
from /home/muichkine/.rvm/gems/ruby-2.0.0-p247/gems/activemodel-4.0.0/lib/active_model/validations.rb:314:in `valid?'
from /home/muichkine/.rvm/gems/ruby-2.0.0-p247/bundler/gems/mongoid-38de2e96edc8/lib/mongoid/validatable.rb:98:in `valid?'
from (irb):3
from /home/muichkine/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.0/lib/rails/commands/console.rb:90:in `start'
from /home/muichkine/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.0/lib/rails/commands/console.rb:9:in `start'
from /home/muichkine/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.0/lib/rails/commands.rb:64:in `<top (required)>'
from /home/muichkine/src/white/bin/rails:4:in `require'
from /home/muichkine/src/white/bin/rails:4:in `<top (required)>'
from -e:1:in `load'
from -e:1:in `<main>'
>> contact = Contact.new
contact = Contact.new
#<Contact _id: 5228ae441d41c8678c000002, organization_ids: nil, _type: "Contact">
>> contact.valid?
true
如您所见，验证联系人有效，而验证组织无效。现在，我确实尝试:inverse_of在两侧添加选项，但错误仍然存在。任何输入表示赞赏。
我使用：带有 Rails 4 / Ruby 2.0.0-p247 的 mongoid (4.0.0 38de2e9)