我刚刚升级到Mongoid3，我得到了这些错误的TON：
TypeError:
can't convert String into Integer
当我尝试构建属于另一个模型的模型并分配引用的模型时，问题始终存在：
@entry = FactoryGirl.create(:entry_image, user_id: @user.id, day: 18, month: 6)
似乎是“user_id：@ user.id”部分。我试过了：
@entry = FactoryGirl.build(:entry_image, day: 18, month: 6)
@entry.user = @user
@entry.save
每次都有相同的错误。
这是工厂文件：
FactoryGirl.define do
factory :user do
name 'Test User'
email 'example@example.com'
password 'please'
password_confirmation 'please'
pin '1234'
default_time_zone 'America/New_York'
end
...
我正在使用设计，这是我们运行的控制器宏：
module ControllerMacros
def login_user
before(:each) do
@request.env["devise.mapping"] = Devise.mappings[:user]
@user = FactoryGirl.create(:user)
#user.confirm! # or set a confirmed_at inside the factory. Only necessary if you are using the confirmable module
sign_in @user
end
end
end
这是完整的堆栈跟踪：
> 1.9.3p194 :016 > user = User.all[0]
=> #<User _id: 503e9c807adf9d6551000001, _type: nil, email: "joe@email.com", encrypted_password: "$5a$10$Mt1kx/TtbDma4gVtcTLdLeeP6tcSiF2AJkjeJmv73/U5OWF.M34v.", remember_created_at: 2012-08-29 23:30:17 UTC, sign_in_count: 3, current_sign_in_at: 2012-08-29 23:30:17 UTC, last_sign_in_at: 2012-08-29 22:49:57 UTC, current_sign_in_ip: "127.0.0.1", last_sign_in_ip: "127.0.0.1", s3_access_key: #<Moped::BSON::Binary type=:generic length=24>, s3_secret_key: #<Moped::BSON::Binary type=:generic length=48>, pin: nil, default_time_zone: "America/New_York", name: "Joe Smith">
1.9.3p194 :017 > e = FactoryGirl.create(("entry_image").to_s, user_id: user.id, items: [ FactoryGirl.build(:image, user_id: user.id) ])
TypeError: can't convert String into Integer
from /Users/lee/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/set.rb:185:in `include?'
from /Users/lee/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/set.rb:185:in `include?'
from /Users/lee/.rvm/gems/ruby-1.9.3-p194/gems/mongoid-3.0.5/lib/mongoid/callbacks.rb:140:in `block (3 levels) in cascadable_children'
from /Users/lee/.rvm/gems/ruby-1.9.3-p194/gems/mongoid-3.0.5/lib/mongoid/callbacks.rb:139:in `each'
from /Users/lee/.rvm/gems/ruby-1.9.3-p194/gems/mongoid-3.0.5/lib/mongoid/callbacks.rb:139:in `block (2 levels) in cascadable_children'
from /Users/lee/.rvm/gems/ruby-1.9.3-p194/gems/mongoid-3.0.5/lib/mongoid/relations/accessors.rb:103:in `without_autobuild'
from /Users/lee/.rvm/gems/ruby-1.9.3-p194/gems/mongoid-3.0.5/lib/mongoid/callbacks.rb:133:in `block in cascadable_children'
from /Users/lee/.rvm/gems/ruby-1.9.3-p194/gems/mongoid-3.0.5/lib/mongoid/callbacks.rb:131:in `each_pair'
from /Users/lee/.rvm/gems/ruby-1.9.3-p194/gems/mongoid-3.0.5/lib/mongoid/callbacks.rb:131:in `cascadable_children'
from /Users/lee/.rvm/gems/ruby-1.9.3-p194/gems/mongoid-3.0.5/lib/mongoid/callbacks.rb:95:in `run_callbacks'
from /Users/lee/.rvm/gems/ruby-1.9.3-p194/gems/activemodel-3.2.0/lib/active_model/validations/callbacks.rb:53:in `run_validations!'
from /Users/lee/.rvm/gems/ruby-1.9.3-p194/gems/activemodel-3.2.0/lib/active_model/validations.rb:179:in `valid?'
from /Users/lee/.rvm/gems/ruby-1.9.3-p194/gems/mongoid-3.0.5/lib/mongoid/validations.rb:78:in `valid?'
from /Users/lee/.rvm/gems/ruby-1.9.3-p194/gems/activemodel-3.2.0/lib/active_model/validations.rb:187:in `invalid?'
from /Users/lee/.rvm/gems/ruby-1.9.3-p194/gems/mongoid-3.0.5/lib/mongoid/persistence/insertion.rb:22:in `prepare'
from /Users/lee/.rvm/gems/ruby-1.9.3-p194/gems/mongoid-3.0.5/lib/mongoid/persistence/operations/insert.rb:26:in `persist'
... 4 levels...
from /Users/lee/.rvm/gems/ruby-1.9.3-p194/gems/factory_girl-4.0.0/lib/factory_girl/evaluation.rb:15:in `[]'
from /Users/lee/.rvm/gems/ruby-1.9.3-p194/gems/factory_girl-4.0.0/lib/factory_girl/evaluation.rb:15:in `create'
from /Users/lee/.rvm/gems/ruby-1.9.3-p194/gems/factory_girl-4.0.0/lib/factory_girl/strategy/create.rb:12:in `block in result'
from /Users/lee/.rvm/gems/ruby-1.9.3-p194/gems/factory_girl-4.0.0/lib/factory_girl/strategy/create.rb:9:in `tap'
from /Users/lee/.rvm/gems/ruby-1.9.3-p194/gems/factory_girl-4.0.0/lib/factory_girl/strategy/create.rb:9:in `result'
from /Users/lee/.rvm/gems/ruby-1.9.3-p194/gems/factory_girl-4.0.0/lib/factory_girl/factory.rb:42:in `run'
from /Users/lee/.rvm/gems/ruby-1.9.3-p194/gems/factory_girl-4.0.0/lib/factory_girl/factory_runner.rb:23:in `block in run'
from /Users/lee/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.0/lib/active_support/notifications.rb:125:in `instrument'
from /Users/lee/.rvm/gems/ruby-1.9.3-p194/gems/factory_girl-4.0.0/lib/factory_girl/factory_runner.rb:22:in `run'
from /Users/lee/.rvm/gems/ruby-1.9.3-p194/gems/factory_girl-4.0.0/lib/factory_girl/strategy_syntax_method_registrar.rb:19:in `block in define_singular_strategy_method'
from (irb):17
from /Users/lee/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.0/lib/rails/commands/console.rb:47:in `start'
from /Users/lee/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.0/lib/rails/commands/console.rb:8:in `start'
from /Users/lee/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.0/lib/rails/commands.rb:41:in `<top (required)>'
from script/rails:6:in `require'
from script/rails:6:in `<main>'