我想用 Rspec 测试我的 Rails 应用程序，但我收到了一个 no implicit conversion of Symbol into Integer 错误，没有任何明显的原因。根据我得到的回溯，我认为问题与 Mongo/Mongoid 有关，但是，我无法弄清楚它到底是什么。该代码在生产中完美运行。该错误仅在测试时发生。
简单看一下没有其他方法的模型:
class Card
include Mongoid::Document
field :front, type: String
field :back, type: String
field :level, type: Integer, default: 1
field :review_date, type: DateTime, default: DateTime.now
has_many :card_statistic, dependent: :destroy
belongs_to :topic
belongs_to :user
validates :front, :back, :level, presence: true
validates :topic, presence: { is: true, message: "must belong to a topic." }
validates :user, presence: { is: true, message: "must belong to a user." }
validates :level, numericality: { only_integer: true, greater_than: 0 }
end
模型中触发错误的一个函数:
def self.reset(card)
card.update(level: 1)
end
测试代码:
it "puts the given card in level 1" do
card = create(:card)
Card.correct card
card.reload
Card.correct card
card.reload
expect(card.level).to eq(3)
card.reset
card.reload
expect(card.level).to eq(1)
end
然后，我得到的错误回溯:
1) Card puts the given card in level 1
Failure/Error: Card.reset card
TypeError:
no implicit conversion of Symbol into Integer
# /home/huesitos/.rvm/gems/ruby-2.2.0/gems/mongo-2.0.4/lib/mongo/server_selector.rb:56:in `[]'
# /home/huesitos/.rvm/gems/ruby-2.2.0/gems/mongo-2.0.4/lib/mongo/server_selector.rb:56:in `get'
# /home/huesitos/.rvm/gems/ruby-2.2.0/gems/mongo-2.0.4/lib/mongo/client.rb:170:in `read_preference'
# /home/huesitos/.rvm/gems/ruby-2.2.0/gems/mongo-2.0.4/lib/mongo/collection/view/readable.rb:318:in `default_read'
# /home/huesitos/.rvm/gems/ruby-2.2.0/gems/mongo-2.0.4/lib/mongo/collection/view/readable.rb:251:in `read'
# /home/huesitos/.rvm/gems/ruby-2.2.0/gems/mongo-2.0.4/lib/mongo/collection/view/iterable.rb:38:in `each'
# /home/huesitos/.rvm/gems/ruby-2.2.0/bundler/gems/mongoid-c61547d5ed15/lib/mongoid/query_cache.rb:207:in `each'
# /home/huesitos/.rvm/gems/ruby-2.2.0/bundler/gems/mongoid-c61547d5ed15/lib/mongoid/contextual/mongo.rb:230:in `first'
# /home/huesitos/.rvm/gems/ruby-2.2.0/bundler/gems/mongoid-c61547d5ed15/lib/mongoid/contextual/mongo.rb:230:in `block (2 levels) in first'
# /home/huesitos/.rvm/gems/ruby-2.2.0/bundler/gems/mongoid-c61547d5ed15/lib/mongoid/contextual/mongo.rb:562:in `with_sorting'
# /home/huesitos/.rvm/gems/ruby-2.2.0/bundler/gems/mongoid-c61547d5ed15/lib/mongoid/contextual/mongo.rb:229:in `block in first'
# /home/huesitos/.rvm/gems/ruby-2.2.0/bundler/gems/mongoid-c61547d5ed15/lib/mongoid/contextual/mongo.rb:474:in `try_cache'
# /home/huesitos/.rvm/gems/ruby-2.2.0/bundler/gems/mongoid-c61547d5ed15/lib/mongoid/contextual/mongo.rb:228:in `first'
# /home/huesitos/.rvm/gems/ruby-2.2.0/bundler/gems/mongoid-c61547d5ed15/lib/mongoid/contextual.rb:20:in `first'
# /home/huesitos/.rvm/gems/ruby-2.2.0/bundler/gems/mongoid-c61547d5ed15/lib/mongoid/relations/builders/referenced/in.rb:20:in `build'
# /home/huesitos/.rvm/gems/ruby-2.2.0/bundler/gems/mongoid-c61547d5ed15/lib/mongoid/relations/accessors.rb:43:in `create_relation'
# /home/huesitos/.rvm/gems/ruby-2.2.0/bundler/gems/mongoid-c61547d5ed15/lib/mongoid/relations/accessors.rb:26:in `__build__'
# /home/huesitos/.rvm/gems/ruby-2.2.0/bundler/gems/mongoid-c61547d5ed15/lib/mongoid/relations/accessors.rb:104:in `block (2 levels) in get_relation'
# /home/huesitos/.rvm/gems/ruby-2.2.0/bundler/gems/mongoid-c61547d5ed15/lib/mongoid/threaded/lifecycle.rb:130:in `_loading'
# /home/huesitos/.rvm/gems/ruby-2.2.0/bundler/gems/mongoid-c61547d5ed15/lib/mongoid/relations/accessors.rb:100:in `block in get_relation'
# /home/huesitos/.rvm/gems/ruby-2.2.0/bundler/gems/mongoid-c61547d5ed15/lib/mongoid/threaded/lifecycle.rb:89:in `_building'
# /home/huesitos/.rvm/gems/ruby-2.2.0/bundler/gems/mongoid-c61547d5ed15/lib/mongoid/relations/accessors.rb:99:in `get_relation'
# /home/huesitos/.rvm/gems/ruby-2.2.0/bundler/gems/mongoid-c61547d5ed15/lib/mongoid/relations/accessors.rb:187:in `block in getter'
# /home/huesitos/.rvm/gems/ruby-2.2.0/bundler/gems/mongoid-c61547d5ed15/lib/mongoid/validatable.rb:79:in `read_attribute_for_validation'
# /home/huesitos/.rvm/gems/ruby-2.2.0/gems/activemodel-4.2.0/lib/active_model/validator.rb:149:in `block in validate'
# /home/huesitos/.rvm/gems/ruby-2.2.0/gems/activemodel-4.2.0/lib/active_model/validator.rb:148:in `each'
# /home/huesitos/.rvm/gems/ruby-2.2.0/gems/activemodel-4.2.0/lib/active_model/validator.rb:148:in `validate'
# /home/huesitos/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:450:in `public_send'
# /home/huesitos/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:450:in `block in make_lambda'
# /home/huesitos/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:189:in `call'
# /home/huesitos/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:189:in `block in simple'
# /home/huesitos/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:190:in `call'
# /home/huesitos/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:190:in `block in simple'
# /home/huesitos/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:190:in `call'
# /home/huesitos/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:190:in `block in simple'
# /home/huesitos/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:92:in `call'
# /home/huesitos/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:92:in `_run_callbacks'
# /home/huesitos/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:734:in `_run_validate_callbacks'
# /home/huesitos/.rvm/gems/ruby-2.2.0/gems/activemodel-4.2.0/lib/active_model/validations.rb:395:in `run_validations!'
# /home/huesitos/.rvm/gems/ruby-2.2.0/gems/activemodel-4.2.0/lib/active_model/validations/callbacks.rb:113:in `block in run_validations!'
# /home/huesitos/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:88:in `call'
# /home/huesitos/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:88:in `_run_callbacks'
# /home/huesitos/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:734:in `_run_validation_callbacks'
# /home/huesitos/.rvm/gems/ruby-2.2.0/gems/activemodel-4.2.0/lib/active_model/validations/callbacks.rb:113:in `run_validations!'
# /home/huesitos/.rvm/gems/ruby-2.2.0/gems/activemodel-4.2.0/lib/active_model/validations.rb:334:in `valid?'
# /home/huesitos/.rvm/gems/ruby-2.2.0/bundler/gems/mongoid-c61547d5ed15/lib/mongoid/validatable.rb:97:in `valid?'
# /home/huesitos/.rvm/gems/ruby-2.2.0/gems/activemodel-4.2.0/lib/active_model/validations.rb:371:in `invalid?'
# /home/huesitos/.rvm/gems/ruby-2.2.0/bundler/gems/mongoid-c61547d5ed15/lib/mongoid/persistable/updatable.rb:114:in `prepare_update'
# /home/huesitos/.rvm/gems/ruby-2.2.0/bundler/gems/mongoid-c61547d5ed15/lib/mongoid/persistable/updatable.rb:139:in `update_document'
# /home/huesitos/.rvm/gems/ruby-2.2.0/bundler/gems/mongoid-c61547d5ed15/lib/mongoid/persistable/savable.rb:25:in `save'
# /home/huesitos/.rvm/gems/ruby-2.2.0/bundler/gems/mongoid-c61547d5ed15/lib/mongoid/persistable/updatable.rb:52:in `update'
# ./app/models/card.rb:57:in `reset'
# ./spec/models/card_spec.rb:32:in `block (2 levels) in <top (required)>'
测试 Controller 时也会触发错误。即使执行 get :index 也会抛出错误。预先感谢您的帮助。
最佳答案
显然，Mongoid 的最新版本存在一些问题，我直接从存储库中提取代码，而没有指定稳定版本。因此解决方案是要么将版本降级到 4.0，要么明确使用 5.0 beta 版本。
要么
gem 'mongoid', '~> 5.0.0.beta', github: 'mongoid/mongoid'
或
gem 'mongoid', '~> 4'
代替
gem 'mongoid', '~> 5', github: 'mongoid/mongoid'
关于ruby-on-rails - 获取 Rspec 错误没有使用 Mongoid 将 Symbol 隐式转换为 Integer，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/31059008/