Ruby 在has_one所属对象之间创建mongoid关系将引发错误

我有这种关系：

class EmailType
  include Mongoid::Document
  include Mongoid::Timestamps
  has_one :job_status, :inverse_of => :email_type

class JobStatus
  include Mongoid::Document
  belongs_to :email_type, :inverse_of => :job_status

但是，当我试图建立它们之间的关系时，我得到了一个错误。就我所能看到的情况而言，我的示例如下所示

这对我来说是个谜，因为错误消息显示

namererror:uninitialized constant JobStatu

和not

namererror:uninitialized constant JobStatus

Loading development environment (Rails 3.2.12)
2.0.0-p247 :001 > e = EmailType.new
 => #<EmailType _id: 51eafe9183c3366282000001, created_at: nil, updated_at: nil, name: nil, type: nil, value: nil, from: nil, subject: nil, line_break: "\n", order_id_line: nil, order_id_regex: nil, mail_address_line: nil, mail_address_regex: nil, name_line: nil, name_regex: nil, user_id: nil> 
2.0.0-p247 :002 > j = JobStatus.new
 => #<JobStatus _id: 51eafea583c3366282000002, group_id: nil, name: nil, status: "new", error_msg: "", extra: {}, email_type_id: nil> 
2.0.0-p247 :003 > e.job_status = j
NameError: uninitialized constant JobStatu
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-3.2.12/lib/active_support/inflector/methods.rb:230:in `block in constantize'
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-3.2.12/lib/active_support/inflector/methods.rb:229:in `each'
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-3.2.12/lib/active_support/inflector/methods.rb:229:in `constantize'
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-3.2.12/lib/active_support/core_ext/string/inflections.rb:54:in `constantize'
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/metadata.rb:630:in `klass'
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/proxy.rb:54:in `klass'
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/referenced/one.rb:21:in `block in initialize'
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/proxy.rb:41:in `init'
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/referenced/one.rb:20:in `initialize'
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/accessors.rb:44:in `new'
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/accessors.rb:44:in `create_relation'
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/accessors.rb:26:in `__build__'
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/accessors.rb:269:in `block (2 levels) in setter'
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/accessors.rb:175:in `without_autobuild'
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/accessors.rb:263:in `block in setter'
from (irb):3
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/railties-3.2.12/lib/rails/commands/console.rb:47:in `start'
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/railties-3.2.12/lib/rails/commands/console.rb:8:in `start'
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/railties-3.2.12/lib/rails/commands.rb:41:in `<top (required)>'
from script/rails:6:in `require'
from script/rails:6:in `<main>'2.0.0-p247 :004 > 

加载开发环境（Rails 3.2.12）
2.0.0-p247:001>e=EmailType.new
=> # 
2.0.0-p247:002>j=JobStatus.new
=> # 
2.0.0-p247:003>e.job_status=j
NameError:未初始化的常量作业状态
from/Users/christoff jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-3.2.12/lib/active\u support/influctor/methods.rb:230:in“块体不变”
from/Users/christoff jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-3.2.12/lib/active\u support/endoctor/methods.rb:229:in'each'
from/Users/christoff jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-3.2.12/lib/active\u support/endoctor/methods.rb:229:in'constantize'
from/Users/christoff jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-3.2.12/lib/active\u support/core\u ext/string/influctions.rb:54:in`constantize'
from/Users/christoff jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/metadata.rb:630:in`klass'
from/Users/christoff jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/proxy.rb:54:in`klass'
from/Users/christoff jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/referenced/one.rb:21:在“初始化中的块”中
from/Users/christoff jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/proxy.rb:41:in`init'
from/Users/christoff jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/referenced/one.rb:20:in'initialize'
from/Users/christoff jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/accessors.rb:44:in'new'
from/Users/christoff jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/accessors.rb:44:in“create_relations”
from/Users/christoff jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/accessors.rb:26:in `\uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu
from/Users/christoff jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/accessors.rb:269:in'block（2层）in setter'
from/Users/christoff jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/accessors.rb:175:in'without_autobuild'
from/Users/christoff jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/accessors.rb:263:in“setter中的块”
来自（irb）：3
from/Users/christoff-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/railties-3.2.12/lib/rails/commands/console.rb:47:in'start'
from/Users/christoff jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/railties-3.2.12/lib/rails/commands/console.rb:8:in'start'
来自/Users/christoff jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/railties-3.2.12/lib/rails/commands.rb:41:in`'
来自脚本/rails:6:in'require'
来自脚本/rails:6:in`'2.0.0-p247:004>

为了确保我没有弄混，我试着用另一种方法：

Loading development environment (Rails 3.2.12)
2.0.0-p247 :001 > e = EmailType.new
 => #<EmailType _id: 51eaff9283c3365840000001, created_at: nil, updated_at: nil, name: nil, type: nil, value: nil, from: nil, subject: nil, line_break: "\n", order_id_line: nil, order_id_regex: nil, mail_address_line: nil, mail_address_regex: nil, name_line: nil, name_regex: nil, user_id: nil> 
2.0.0-p247 :002 > j = JobStatus.new
 => #<JobStatus _id: 51eaff9483c3365840000002, group_id: nil, name: nil, status: "new", error_msg: "", extra: {}, email_type_id: nil> 
2.0.0-p247 :003 > j.email_type = e
NameError: uninitialized constant JobStatu
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-3.2.12/lib/active_support/inflector/methods.rb:230:in `block in constantize'
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-3.2.12/lib/active_support/inflector/methods.rb:229:in `each'
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-3.2.12/lib/active_support/inflector/methods.rb:229:in `constantize'
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-3.2.12/lib/active_support/core_ext/string/inflections.rb:54:in `constantize'
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/metadata.rb:630:in `klass'
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/proxy.rb:54:in `klass'
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/referenced/one.rb:21:in `block in initialize'
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/proxy.rb:41:in `init'
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/referenced/one.rb:20:in `initialize'
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/accessors.rb:44:in `new'
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/accessors.rb:44:in `create_relation'
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/accessors.rb:26:in `__build__'
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/accessors.rb:269:in `block (2 levels) in setter'
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/accessors.rb:175:in `without_autobuild'
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/accessors.rb:263:in `block in setter'
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/extensions/object.rb:104:in `do_or_do_not'
... 5 levels...
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/proxy.rb:25:in `bind_one'
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/referenced/in.rb:25:in `block in initialize'
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/proxy.rb:41:in `init'
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/referenced/in.rb:23:in `initialize'
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/accessors.rb:44:in `new'
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/accessors.rb:44:in `create_relation'
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/accessors.rb:26:in `__build__'
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/accessors.rb:269:in `block (2 levels) in setter'
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/accessors.rb:175:in `without_autobuild'
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/accessors.rb:263:in `block in setter'
from (irb):3
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/railties-3.2.12/lib/rails/commands/console.rb:47:in `start'
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/railties-3.2.12/lib/rails/commands/console.rb:8:in `start'
from /Users/christoffer-jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/railties-3.2.12/lib/rails/commands.rb:41:in `<top (required)>'
from script/rails:6:in `require'
from script/rails:6:in `<main>'2.0.0-p247 :004 >

加载开发环境（Rails 3.2.12）
2.0.0-p247:001>e=EmailType.new
=> # 
2.0.0-p247:002>j=JobStatus.new
=> # 
2.0.0-p247:003>j.email_type=e
NameError:未初始化的常量作业状态
from/Users/christoff jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-3.2.12/lib/active\u support/influctor/methods.rb:230:in“块体不变”
from/Users/christoff jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-3.2.12/lib/active\u support/endoctor/methods.rb:229:in'each'
from/Users/christoff jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-3.2.12/lib/active\u support/endoctor/methods.rb:229:in'constantize'
from/Users/christoff jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-3.2.12/lib/active\u support/core\u ext/string/influctions.rb:54:in`constantize'
from/Users/christoff jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/metadata.rb:630:in`klass'
from/Users/christoff jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/proxy.rb:54:in`klass'
from/Users/christoff jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/referenced/one.rb:21:在“初始化中的块”中
from/Users/christoff jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/proxy.rb:41:in`init'
from/Users/christoff jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/referenced/one.rb:20:in'initialize'
from/Users/christoff jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/accessors.rb:44:in'new'
from/Users/christoff jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/accessors.rb:44:in“create_relations”
from/Users/christoff jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/accessors.rb:26:in `\uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu
from/Users/christoff jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/accessors.rb:269:in'block（2层）in setter'
from/Users/christoff jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/accessors.rb:175:in'without_autobuild'
from/Users/christoff jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/accessors.rb:263:in“setter中的块”
from/Users/christoff jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/extensions/object.rb:104:in'do_或_do_'
... 5级。。。
from/Users/christoff jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/proxy.rb:25:in'bind_one'
来自/Users/christoff jorgensen/.rvm/gems/ruby-2.0.0-p247/gems/mongoid-3.1.3/lib/mongoid/relations/referenced/i
ActiveSupport::Inflector.inflections do |inflect|
  inflect.singular("jobstatus", "jobstatus")
end

has_one :job_status, :inverse_of => :email_type, :class_name => "JobStatus"

class EmailType
  include Mongoid::Document
  include Mongoid::Timestamps
  has_one :job_status, :inverse_of => :email_type, :class_name => "JobStatus"