Mongoid 2.2.0自动保存抛出堆栈级别太深的异常

Question

在Mongoid 2.2.0上，从Mongoid 2.0.0.rc7迁移，现在当我保存我的模型实例时，我得到一个堆栈级别太深的异常，这在rc7上没有发生。

以下是我的模型，非常简单：

class Firm
  include Mongoid::Document
  references_many :accounts, :autosave => true
end

class Account
  include Mongoid::Document
  field :name, :type => String
  referenced_in :firm, :autosave => true
end

以下是一些示例代码：

firm = Firm.create! :name=>'XYZ'
acc = Account.create! :name=>"Hello", :firm=>firm

在Account.create!

上抛出异常

创建帐户会产生巨大的堆栈跟踪：

SystemStackError: stack level too deep
    org/jruby/RubyArray.java:1615:in `each'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/relations/auto_save.rb:28:in `_callback_after_103'
    /home/x/.rvm/gems/jruby-1.6.7/gems/activesupport-3.0.3/lib/active_support/callbacks.rb:429:in `_run_save_callbacks'
    org/jruby/RubyBasicObject.java:1698:in `__send__'
    org/jruby/RubyKernel.java:2097:in `send'
    /home/x/.rvm/gems/jruby-1.6.7/gems/activesupport-3.0.3/lib/active_support/callbacks.rb:93:in `run_callbacks'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence/modification.rb:23:in `prepare'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence/operations/update.rb:43:in `persist'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence.rb:86:in `update'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence.rb:151:in `upsert'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/relations/auto_save.rb:29:in `_callback_after_67'
    org/jruby/RubyArray.java:1615:in `each'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/relations/auto_save.rb:28:in `_callback_after_67'
    /home/x/.rvm/gems/jruby-1.6.7/gems/activesupport-3.0.3/lib/active_support/callbacks.rb:429:in `_run_save_callbacks'
    org/jruby/RubyBasicObject.java:1698:in `__send__'
    org/jruby/RubyKernel.java:2097:in `send'
    /home/x/.rvm/gems/jruby-1.6.7/gems/activesupport-3.0.3/lib/active_support/callbacks.rb:93:in `run_callbacks'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence/modification.rb:23:in `prepare'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence/operations/update.rb:43:in `persist'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence.rb:86:in `update'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence.rb:151:in `upsert'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/relations/auto_save.rb:29:in `_callback_after_103'
    org/jruby/RubyArray.java:1615:in `each'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/relations/auto_save.rb:28:in `_callback_after_103'
    /home/x/.rvm/gems/jruby-1.6.7/gems/activesupport-3.0.3/lib/active_support/callbacks.rb:429:in `_run_save_callbacks'
    org/jruby/RubyBasicObject.java:1698:in `__send__'
    org/jruby/RubyKernel.java:2097:in `send'
    /home/x/.rvm/gems/jruby-1.6.7/gems/activesupport-3.0.3/lib/active_support/callbacks.rb:93:in `run_callbacks'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence/modification.rb:23:in `prepare'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence/operations/update.rb:43:in `persist'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence.rb:86:in `update'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence.rb:151:in `upsert'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/relations/auto_save.rb:29:in `_callback_after_67'
    org/jruby/RubyArray.java:1615:in `each'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/relations/auto_save.rb:28:in `_callback_after_67'
    /home/x/.rvm/gems/jruby-1.6.7/gems/activesupport-3.0.3/lib/active_support/callbacks.rb:429:in `_run_save_callbacks'
    org/jruby/RubyBasicObject.java:1698:in `__send__'
    org/jruby/RubyKernel.java:2097:in `send'
    /home/x/.rvm/gems/jruby-1.6.7/gems/activesupport-3.0.3/lib/active_support/callbacks.rb:93:in `run_callbacks'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence/modification.rb:23:in `prepare'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence/operations/update.rb:43:in `persist'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence.rb:86:in `update'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence.rb:151:in `upsert'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/relations/auto_save.rb:29:in `_callback_after_103'
    org/jruby/RubyArray.java:1615:in `each'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/relations/auto_save.rb:28:in `_callback_after_103'
    /home/x/.rvm/gems/jruby-1.6.7/gems/activesupport-3.0.3/lib/active_support/callbacks.rb:429:in `_run_save_callbacks'
    org/jruby/RubyBasicObject.java:1698:in `__send__'
    org/jruby/RubyKernel.java:2097:in `send'
    /home/x/.rvm/gems/jruby-1.6.7/gems/activesupport-3.0.3/lib/active_support/callbacks.rb:93:in `run_callbacks'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence/modification.rb:23:in `prepare'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence/operations/update.rb:43:in `persist'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence.rb:86:in `update'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence.rb:151:in `upsert'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/relations/auto_save.rb:29:in `_callback_after_67'
    org/jruby/RubyArray.java:1615:in `each'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/relations/auto_save.rb:28:in `_callback_after_67'
    /home/x/.rvm/gems/jruby-1.6.7/gems/activesupport-3.0.3/lib/active_support/callbacks.rb:429:in `_run_save_callbacks'
    org/jruby/RubyBasicObject.java:1698:in `__send__'
    org/jruby/RubyKernel.java:2097:in `send'
    /home/x/.rvm/gems/jruby-1.6.7/gems/activesupport-3.0.3/lib/active_support/callbacks.rb:93:in `run_callbacks'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence/modification.rb:23:in `prepare'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence/operations/update.rb:43:in `persist'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence.rb:86:in `update'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence.rb:151:in `upsert'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/relations/auto_save.rb:29:in `_callback_after_103'
    org/jruby/RubyArray.java:1615:in `each'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/relations/auto_save.rb:28:in `_callback_after_103'
    /home/x/.rvm/gems/jruby-1.6.7/gems/activesupport-3.0.3/lib/active_support/callbacks.rb:429:in `_run_save_callbacks'
    org/jruby/RubyBasicObject.java:1698:in `__send__'
    org/jruby/RubyKernel.java:2097:in `send'
    /home/x/.rvm/gems/jruby-1.6.7/gems/activesupport-3.0.3/lib/active_support/callbacks.rb:93:in `run_callbacks'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence/modification.rb:23:in `prepare'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence/operations/update.rb:43:in `persist'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence.rb:86:in `update'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence.rb:151:in `upsert'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/relations/auto_save.rb:29:in `_callback_after_67'
    org/jruby/RubyArray.java:1615:in `each'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/relations/auto_save.rb:28:in `_callback_after_67'
    /home/x/.rvm/gems/jruby-1.6.7/gems/activesupport-3.0.3/lib/active_support/callbacks.rb:429:in `_run_save_callbacks'
    org/jruby/RubyBasicObject.java:1698:in `__send__'
    org/jruby/RubyKernel.java:2097:in `send'
    /home/x/.rvm/gems/jruby-1.6.7/gems/activesupport-3.0.3/lib/active_support/callbacks.rb:93:in `run_callbacks'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence/modification.rb:23:in `prepare'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence/operations/update.rb:43:in `persist'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence.rb:86:in `update'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence.rb:151:in `upsert'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/relations/auto_save.rb:29:in `_callback_after_103'
    org/jruby/RubyArray.java:1615:in `each'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/relations/auto_save.rb:28:in `_callback_after_103'
    /home/x/.rvm/gems/jruby-1.6.7/gems/activesupport-3.0.3/lib/active_support/callbacks.rb:429:in `_run_save_callbacks'
    org/jruby/RubyBasicObject.java:1698:in `__send__'
    org/jruby/RubyKernel.java:2097:in `send'
    /home/x/.rvm/gems/jruby-1.6.7/gems/activesupport-3.0.3/lib/active_support/callbacks.rb:93:in `run_callbacks'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence/modification.rb:23:in `prepare'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence/operations/update.rb:43:in `persist'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence.rb:86:in `update'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence.rb:151:in `upsert'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/relations/auto_save.rb:29:in `_callback_after_67'
    org/jruby/RubyArray.java:1615:in `each'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/relations/auto_save.rb:28:in `_callback_after_67'
    /home/x/.rvm/gems/jruby-1.6.7/gems/activesupport-3.0.3/lib/active_support/callbacks.rb:429:in `_run_save_callbacks'
    org/jruby/RubyBasicObject.java:1698:in `__send__'
    org/jruby/RubyKernel.java:2097:in `send'
    /home/x/.rvm/gems/jruby-1.6.7/gems/activesupport-3.0.3/lib/active_support/callbacks.rb:93:in `run_callbacks'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence/modification.rb:23:in `prepare'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence/operations/update.rb:43:in `persist'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence.rb:86:in `update'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence.rb:151:in `upsert'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/relations/auto_save.rb:29:in `_callback_after_103'
    org/jruby/RubyArray.java:1615:in `each'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/relations/auto_save.rb:28:in `_callback_after_103'
    /home/x/.rvm/gems/jruby-1.6.7/gems/activesupport-3.0.3/lib/active_support/callbacks.rb:429:in `_run_save_callbacks'
    org/jruby/RubyBasicObject.java:1698:in `__send__'
    org/jruby/RubyKernel.java:2097:in `send'
    /home/x/.rvm/gems/jruby-1.6.7/gems/activesupport-3.0.3/lib/active_support/callbacks.rb:93:in `run_callbacks'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence/modification.rb:23:in `prepare'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence/operations/update.rb:43:in `persist'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence.rb:86:in `update'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence.rb:151:in `upsert'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/relations/auto_save.rb:29:in `_callback_after_67'
    org/jruby/RubyArray.java:1615:in `each'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/relations/auto_save.rb:28:in `_callback_after_67'
    /home/x/.rvm/gems/jruby-1.6.7/gems/activesupport-3.0.3/lib/active_support/callbacks.rb:429:in `_run_save_callbacks'
    org/jruby/RubyBasicObject.java:1698:in `__send__'
    org/jruby/RubyKernel.java:2097:in `send'
    /home/x/.rvm/gems/jruby-1.6.7/gems/activesupport-3.0.3/lib/active_support/callbacks.rb:93:in `run_callbacks'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence/modification.rb:23:in `prepare'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence/operations/update.rb:43:in `persist'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence.rb:86:in `update'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence.rb:151:in `upsert'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/relations/auto_save.rb:29:in `_callback_after_103'
    org/jruby/RubyArray.java:1615:in `each'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/relations/auto_save.rb:28:in `_callback_after_103'
    /home/x/.rvm/gems/jruby-1.6.7/gems/activesupport-3.0.3/lib/active_support/callbacks.rb:429:in `_run_save_callbacks'
    org/jruby/RubyBasicObject.java:1698:in `__send__'
    org/jruby/RubyKernel.java:2097:in `send'
    /home/x/.rvm/gems/jruby-1.6.7/gems/activesupport-3.0.3/lib/active_support/callbacks.rb:93:in `run_callbacks'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence/modification.rb:23:in `prepare'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence/operations/update.rb:43:in `persist'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence.rb:86:in `update'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence.rb:151:in `upsert'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/relations/auto_save.rb:29:in `_callback_after_67'
    org/jruby/RubyArray.java:1615:in `each'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/relations/auto_save.rb:28:in `_callback_after_67'
    /home/x/.rvm/gems/jruby-1.6.7/gems/activesupport-3.0.3/lib/active_support/callbacks.rb:429:in `_run_save_callbacks'
    org/jruby/RubyBasicObject.java:1698:in `__send__'
    org/jruby/RubyKernel.java:2097:in `send'
    /home/x/.rvm/gems/jruby-1.6.7/gems/activesupport-3.0.3/lib/active_support/callbacks.rb:93:in `run_callbacks'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence/modification.rb:23:in `prepare'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence/operations/update.rb:43:in `persist'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence.rb:86:in `update'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence.rb:151:in `upsert'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/relations/auto_save.rb:29:in `_callback_after_103'
    org/jruby/RubyArray.java:1615:in `each'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/relations/auto_save.rb:28:in `_callback_after_103'
    /home/x/.rvm/gems/jruby-1.6.7/gems/activesupport-3.0.3/lib/active_support/callbacks.rb:429:in `_run_save_callbacks'
    org/jruby/RubyBasicObject.java:1698:in `__send__'
    org/jruby/RubyKernel.java:2097:in `send'
    /home/x/.rvm/gems/jruby-1.6.7/gems/activesupport-3.0.3/lib/active_support/callbacks.rb:93:in `run_callbacks'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence/modification.rb:23:in `prepare'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence/operations/update.rb:43:in `persist'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence.rb:86:in `update'
    /home/x/.rvm/gems/jruby-1.6.7/gems/mongoid-2.2.0/lib/mongoid/persistence.rb:151:in `upsert'

我是否只需要在一个模型中定义autosave？因为如果我这样做，那么这似乎有效。我理解为什么在两个模型中放置自动保存会导致无限循环，但是什么是正确的解决方案？