ruby-on-rails - TypeError:在Rails 3.2项目中使用模型对象时，Proc的分配器未定义

Question

当我处理Staffer类型的对象时，该对象继承了User，后者又继承了ActiveRecord::Base，因此出现错误“TypeError:Proc分配器 undefined ”。

我不确定是什么原因导致它开始发生的，不幸的是，要跟踪所做的提交并不容易。由于系统运行正常，因此user.rb不变，而staffer.rb仅更改一行以删除未使用的常量。

我首先在运行rake任务时注意到该错误，并且该错误是从执行此操作的行生成的:

attributes.slice("id", "email", "state")

进一步的调查表明，这也触发了错误:

puts attributes

这是回溯:

rake aborted!
allocator undefined for Proc
/Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:227:in `allocate'
/Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:227:in `revive'
/Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:183:in `visit_Psych_Nodes_Mapping'
/Users/pupeno/.rvm/gems/ruby-1.9.2-p290@watu/gems/delayed_job-3.0.1/lib/delayed/psych_ext.rb:119:in `visit_Psych_Nodes_Mapping_with_class'
/Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/visitor.rb:7:in `accept'
/Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:16:in `accept'
/Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:228:in `block in revive'
/Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:228:in `map'
/Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:228:in `revive'
/Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:183:in `visit_Psych_Nodes_Mapping'
/Users/pupeno/.rvm/gems/ruby-1.9.2-p290@watu/gems/delayed_job-3.0.1/lib/delayed/psych_ext.rb:119:in `visit_Psych_Nodes_Mapping_with_class'
/Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/visitor.rb:7:in `accept'
/Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:16:in `accept'
/Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:116:in `block in visit_Psych_Nodes_Sequence'
/Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:116:in `each'
/Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:116:in `visit_Psych_Nodes_Sequence'
/Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/visitor.rb:8:in `accept'
/Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:16:in `accept'
/Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:228:in `block in revive'
/Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:228:in `map'
/Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:228:in `revive'
/Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:183:in `visit_Psych_Nodes_Mapping'
/Users/pupeno/.rvm/gems/ruby-1.9.2-p290@watu/gems/delayed_job-3.0.1/lib/delayed/psych_ext.rb:119:in `visit_Psych_Nodes_Mapping_with_class'
/Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/visitor.rb:7:in `accept'
/Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:16:in `accept'
/Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:228:in `block in revive'
/Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:228:in `map'
/Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:228:in `revive'
/Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:183:in `visit_Psych_Nodes_Mapping'
/Users/pupeno/.rvm/gems/ruby-1.9.2-p290@watu/gems/delayed_job-3.0.1/lib/delayed/psych_ext.rb:119:in `visit_Psych_Nodes_Mapping_with_class'
/Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/visitor.rb:7:in `accept'
/Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:16:in `accept'
/Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:191:in `block in visit_Psych_Nodes_Mapping'
/Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:190:in `each'
/Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:190:in `each_slice'
/Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:190:in `visit_Psych_Nodes_Mapping'
/Users/pupeno/.rvm/gems/ruby-1.9.2-p290@watu/gems/delayed_job-3.0.1/lib/delayed/psych_ext.rb:119:in `visit_Psych_Nodes_Mapping_with_class'
/Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/visitor.rb:7:in `accept'
/Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:16:in `accept'
/Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/nodes/node.rb:25:in `to_ruby'
/Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych.rb:107:in `load'
/Users/pupeno/.rvm/gems/ruby-1.9.2-p290@watu/gems/activerecord-3.2.2/lib/active_record/coders/yaml_column.rb:25:in `load'
/Users/pupeno/.rvm/gems/ruby-1.9.2-p290@watu/gems/activerecord-3.2.2/lib/active_record/attribute_methods/serialization.rb:24:in `unserialize'
/Users/pupeno/.rvm/gems/ruby-1.9.2-p290@watu/gems/activerecord-3.2.2/lib/active_record/attribute_methods/serialization.rb:15:in `unserialized_value'
/Users/pupeno/.rvm/gems/ruby-1.9.2-p290@watu/gems/activerecord-3.2.2/lib/active_record/attribute_methods/read.rb:82:in `__temp__'
/Users/pupeno/.rvm/gems/ruby-1.9.2-p290@watu/gems/activerecord-3.2.2/lib/active_record/attribute_methods/read.rb:46:in `type_cast_attribute'
/Users/pupeno/.rvm/gems/ruby-1.9.2-p290@watu/gems/activerecord-3.2.2/lib/active_record/attribute_methods/read.rb:126:in `read_attribute'
/Users/pupeno/.rvm/gems/ruby-1.9.2-p290@watu/gems/activerecord-3.2.2/lib/active_record/attribute_methods.rb:183:in `block in attributes'
/Users/pupeno/.rvm/gems/ruby-1.9.2-p290@watu/gems/activerecord-3.2.2/lib/active_record/attribute_methods.rb:183:in `each'
/Users/pupeno/.rvm/gems/ruby-1.9.2-p290@watu/gems/activerecord-3.2.2/lib/active_record/attribute_methods.rb:183:in `map'
/Users/pupeno/.rvm/gems/ruby-1.9.2-p290@watu/gems/activerecord-3.2.2/lib/active_record/attribute_methods.rb:183:in `attributes'
/Users/pupeno/Documents/watu/app/models/staffer.rb:151:in `index'

为了弄清楚发生了什么，我打开了一个rails控制台，并得到了第一个职员，遇到了同样的错误:

1.9.2-p290 :019 > s = Staffer.first
  Staffer Load (3.8ms)  SELECT "users".* FROM "users" WHERE "users"."type" IN ('Staffer') LIMIT 1
TypeError: allocator undefined for Proc
    from /Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:227:in `allocate'
    from /Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:227:in `revive'
    from /Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:183:in `visit_Psych_Nodes_Mapping'
    from /Users/pupeno/.rvm/gems/ruby-1.9.2-p290@watu/gems/delayed_job-3.0.1/lib/delayed/psych_ext.rb:119:in `visit_Psych_Nodes_Mapping_with_class'
    from /Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/visitor.rb:7:in `accept'
    from /Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:16:in `accept'
    from /Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:228:in `block in revive'
    from /Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:228:in `map'
    from /Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:228:in `revive'
    from /Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:183:in `visit_Psych_Nodes_Mapping'
    from /Users/pupeno/.rvm/gems/ruby-1.9.2-p290@watu/gems/delayed_job-3.0.1/lib/delayed/psych_ext.rb:119:in `visit_Psych_Nodes_Mapping_with_class'
    from /Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/visitor.rb:7:in `accept'
    from /Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:16:in `accept'
    from /Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:116:in `block in visit_Psych_Nodes_Sequence'
    from /Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:116:in `each'
    from /Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:116:in `visit_Psych_Nodes_Sequence'
... 24 levels...
    from /Users/pupeno/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych.rb:107:in `load'
    from /Users/pupeno/.rvm/gems/ruby-1.9.2-p290@watu/gems/activerecord-3.2.2/lib/active_record/coders/yaml_column.rb:25:in `load'
    from /Users/pupeno/.rvm/gems/ruby-1.9.2-p290@watu/gems/activerecord-3.2.2/lib/active_record/attribute_methods/serialization.rb:24:in `unserialize'
    from /Users/pupeno/.rvm/gems/ruby-1.9.2-p290@watu/gems/activerecord-3.2.2/lib/active_record/attribute_methods/serialization.rb:15:in `unserialized_value'
    from /Users/pupeno/.rvm/gems/ruby-1.9.2-p290@watu/gems/activerecord-3.2.2/lib/active_record/attribute_methods/read.rb:82:in `__temp__'
    from /Users/pupeno/.rvm/gems/ruby-1.9.2-p290@watu/gems/activerecord-3.2.2/lib/active_record/attribute_methods/read.rb:46:in `type_cast_attribute'
    from /Users/pupeno/.rvm/gems/ruby-1.9.2-p290@watu/gems/activerecord-3.2.2/lib/active_record/attribute_methods/read.rb:126:in `read_attribute'
    from /Users/pupeno/.rvm/gems/ruby-1.9.2-p290@watu/gems/activerecord-3.2.2/lib/active_record/attribute_methods.rb:200:in `attribute_for_inspect'
    from /Users/pupeno/.rvm/gems/ruby-1.9.2-p290@watu/gems/activerecord-3.2.2/lib/active_record/base.rb:640:in `block in inspect'
    from /Users/pupeno/.rvm/gems/ruby-1.9.2-p290@watu/gems/activerecord-3.2.2/lib/active_record/base.rb:638:in `collect'
    from /Users/pupeno/.rvm/gems/ruby-1.9.2-p290@watu/gems/activerecord-3.2.2/lib/active_record/base.rb:638:in `inspect'
    from /Users/pupeno/.rvm/gems/ruby-1.9.2-p290@watu/gems/railties-3.2.2/lib/rails/commands/console.rb:47:in `start'
    from /Users/pupeno/.rvm/gems/ruby-1.9.2-p290@watu/gems/railties-3.2.2/lib/rails/commands/console.rb:8:in `start'
    from /Users/pupeno/.rvm/gems/ruby-1.9.2-p290@watu/gems/railties-3.2.2/lib/rails/commands.rb:41:in `<top (required)>'
    from script/rails:6:in `require'
    from script/rails:6:in `<main>'
1.9.2-p290 :020 >

Answer 1

您的人员/用户字段之一中是否有任何yaml序列化数据？

如果是这样，我认为这与序列化数据有关，与您的代码无关。检查序列化数据中是否有一个序列化的Proc对象左右……这应该是无法加载它的原因，导致Procs无法序列化!

请参阅this论坛帖子。