NoMethodError：用戶創建軌道上nil：NilClass的未定義方法“ each”

Question

當我在開發中運行Rails 5.1應用程序時，一切都很好，但是當我在Heroku上運行它並嘗試創建用戶時，卻不斷出現此錯誤。

    NoMethodError: undefined method `each' for nil:NilClass
/app/vendor/bundle/ruby/2.4.0/gems/mongo-2.5.3/lib/mongo/cluster.rb:192:in `initialize'
/app/vendor/bundle/ruby/2.4.0/gems/mongo-2.5.3/lib/mongo/client.rb:454:in `new'
/app/vendor/bundle/ruby/2.4.0/gems/mongo-2.5.3/lib/mongo/client.rb:454:in `create_from_addresses'
/app/vendor/bundle/ruby/2.4.0/gems/mongo-2.5.3/lib/mongo/client.rb:253:in `initialize'
/app/vendor/bundle/ruby/2.4.0/gems/mongoid-7.0.1/lib/mongoid/clients/factory.rb:64:in `new'
/app/vendor/bundle/ruby/2.4.0/gems/mongoid-7.0.1/lib/mongoid/clients/factory.rb:64:in `create_client'
/app/vendor/bundle/ruby/2.4.0/gems/mongoid-7.0.1/lib/mongoid/clients/factory.rb:27:in `create'
/app/vendor/bundle/ruby/2.4.0/gems/mongoid-7.0.1/lib/mongoid/clients.rb:69:in `block in with_name'
/app/vendor/bundle/ruby/2.4.0/gems/mongoid-7.0.1/lib/mongoid/clients.rb:68:in `synchronize'
/app/vendor/bundle/ruby/2.4.0/gems/mongoid-7.0.1/lib/mongoid/clients.rb:68:in `with_name'
/app/vendor/bundle/ruby/2.4.0/gems/mongoid-7.0.1/lib/mongoid/persistence_context.rb:110:in `client'
/app/vendor/bundle/ruby/2.4.0/gems/mongoid-7.0.1/lib/mongoid/persistence_context.rb:70:in `collection'
/app/vendor/bundle/ruby/2.4.0/gems/mongoid-7.0.1/lib/mongoid/clients/options.rb:73:in `collection'
/app/vendor/bundle/ruby/2.4.0/gems/mongoid-7.0.1/lib/mongoid/contextual/mongo.rb:342:in `initialize'
/app/vendor/bundle/ruby/2.4.0/gems/mongoid-7.0.1/lib/mongoid/contextual.rb:53:in `new'
/app/vendor/bundle/ruby/2.4.0/gems/mongoid-7.0.1/lib/mongoid/contextual.rb:53:in `create_context'
/app/vendor/bundle/ruby/2.4.0/gems/mongoid-7.0.1/lib/mongoid/contextual.rb:35:in `context'
/app/vendor/bundle/ruby/2.4.0/gems/mongoid-7.0.1/lib/mongoid/contextual.rb:20:in `exists?'
/app/vendor/bundle/ruby/2.4.0/gems/mongoid-7.0.1/lib/mongoid/validatable/uniqueness.rb:276:in `validate_root'
/app/vendor/bundle/ruby/2.4.0/gems/mongoid-7.0.1/lib/mongoid/validatable/uniqueness.rb:48:in `block in validate_each'
/app/vendor/bundle/ruby/2.4.0/gems/mongoid-7.0.1/lib/mongoid/validatable/queryable.rb:23:in `with_query'
/app/vendor/bundle/ruby/2.4.0/gems/mongoid-7.0.1/lib/mongoid/validatable/uniqueness.rb:42:in `validate_each'
/app/vendor/bundle/ruby/2.4.0/gems/activemodel-5.1.0/lib/active_model/validator.rb:150:in `block in validate'
/app/vendor/bundle/ruby/2.4.0/gems/activemodel-5.1.0/lib/active_model/validator.rb:147:in `each'
/app/vendor/bundle/ruby/2.4.0/gems/activemodel-5.1.0/lib/active_model/validator.rb:147:in `validate'
/app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.0/lib/active_support/callbacks.rb:413:in `block in make_lambda'
/app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.0/lib/active_support/callbacks.rb:178:in `block (2 levels) in halting_and_conditional'
/app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.0/lib/active_support/callbacks.rb:601:in `block (2 levels) in default_terminator'
/app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.0/lib/active_support/callbacks.rb:600:in `catch'
/app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.0/lib/active_support/callbacks.rb:600:in `block in default_terminator'
/app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.0/lib/active_support/callbacks.rb:179:in `block in halting_and_conditional'
/app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.0/lib/active_support/callbacks.rb:507:in `block in invoke_before'
/app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.0/lib/active_support/callbacks.rb:507:in `each'
/app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.0/lib/active_support/callbacks.rb:507:in `invoke_before'
/app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.0/lib/active_support/callbacks.rb:130:in `run_callbacks'
/app/vendor/bundle/ruby/2.4.0/gems/mongoid-7.0.1/lib/mongoid/interceptable.rb:132:in `run_callbacks'
/app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.0/lib/active_support/callbacks.rb:825:in `_run_validate_callbacks'
/app/vendor/bundle/ruby/2.4.0/gems/activemodel-5.1.0/lib/active_model/validations.rb:405:in `run_validations!'
/app/vendor/bundle/ruby/2.4.0/gems/activemodel-5.1.0/lib/active_model/validations/callbacks.rb:110:in `block in run_validations!'
/app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.0/lib/active_support/callbacks.rb:131:in `run_callbacks'
/app/vendor/bundle/ruby/2.4.0/gems/mongoid-7.0.1/lib/mongoid/interceptable.rb:132:in `run_callbacks'
/app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.0/lib/active_support/callbacks.rb:825:in `_run_validation_callbacks'
/app/vendor/bundle/ruby/2.4.0/gems/activemodel-5.1.0/lib/active_model/validations/callbacks.rb:110:in `run_validations!'
/app/vendor/bundle/ruby/2.4.0/gems/activemodel-5.1.0/lib/active_model/validations.rb:335:in `valid?'
/app/vendor/bundle/ruby/2.4.0/gems/mongoid-7.0.1/lib/mongoid/validatable.rb:97:in `valid?'
/app/vendor/bundle/ruby/2.4.0/gems/activemodel-5.1.0/lib/active_model/validations.rb:372:in `invalid?'
/app/vendor/bundle/ruby/2.4.0/gems/mongoid-7.0.1/lib/mongoid/persistable/creatable.rb:117:in `prepare_insert'
/app/vendor/bundle/ruby/2.4.0/gems/mongoid-7.0.1/lib/mongoid/persistable/creatable.rb:23:in `insert'
/app/vendor/bundle/ruby/2.4.0/gems/mongoid-7.0.1/lib/mongoid/persistable/savable.rb:23:in `save'
/app/vendor/bundle/ruby/2.4.0/gems/mongoid-7.0.1/lib/mongoid/persistable/savable.rb:44:in `save!'
/app/db/seeds.rb:15:in `block in <top (required)>'
/app/db/seeds.rb:4:in `times'
/app/db/seeds.rb:4:in `<top (required)>'
/app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.0/lib/active_support/dependencies.rb:286:in `load'
/app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.0/lib/active_support/dependencies.rb:286:in `block in load'
/app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.0/lib/active_support/dependencies.rb:258:in `load_dependency'
/app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.0/lib/active_support/dependencies.rb:286:in `load'
/app/vendor/bundle/ruby/2.4.0/gems/mongoid-7.0.1/lib/mongoid/railties/database.rake:20:in `block (2 levels) in <top (required)>'
/app/vendor/bundle/ruby/2.4.0/gems/rake-12.3.1/exe/rake:27:in `<top (required)>'
/app/vendor/bundle/ruby/2.4.0/gems/bundler-1.15.2/lib/bundler/cli/exec.rb:74:in `load'
/app/vendor/bundle/ruby/2.4.0/gems/bundler-1.15.2/lib/bundler/cli/exec.rb:74:in `kernel_load'
/app/vendor/bundle/ruby/2.4.0/gems/bundler-1.15.2/lib/bundler/cli/exec.rb:27:in `run'
/app/vendor/bundle/ruby/2.4.0/gems/bundler-1.15.2/lib/bundler/cli.rb:360:in `exec'
/app/vendor/bundle/ruby/2.4.0/gems/bundler-1.15.2/lib/bundler/vendor/thor/lib/thor/command.rb:27:in `run'
/app/vendor/bundle/ruby/2.4.0/gems/bundler-1.15.2/lib/bundler/vendor/thor/lib/thor/invocation.rb:126:in `invoke_command'
/app/vendor/bundle/ruby/2.4.0/gems/bundler-1.15.2/lib/bundler/vendor/thor/lib/thor.rb:369:in `dispatch'
/app/vendor/bundle/ruby/2.4.0/gems/bundler-1.15.2/lib/bundler/cli.rb:20:in `dispatch'
/app/vendor/bundle/ruby/2.4.0/gems/bundler-1.15.2/lib/bundler/vendor/thor/lib/thor/base.rb:444:in `start'
/app/vendor/bundle/ruby/2.4.0/gems/bundler-1.15.2/lib/bundler/cli.rb:10:in `start'
/app/vendor/bundle/ruby/2.4.0/gems/bundler-1.15.2/exe/bundle:30:in `block in <top (required)>'
/app/vendor/bundle/ruby/2.4.0/gems/bundler-1.15.2/lib/bundler/friendly_errors.rb:121:in `with_friendly_errors'
/app/vendor/bundle/ruby/2.4.0/gems/bundler-1.15.2/exe/bundle:22:in `<top (required)>'
/app/bin/bundle:3:in `load'
/app/bin/bundle:3:in `<main>'

我無法放置可能導致錯誤的內容。 它在mlab中的mongoid上運行數據庫。 不知道這是否是原因。 我無法在heroku控制台中為數據庫設置種子，而不會出現相同的錯誤。

Answer 1

看起來Mongo驅動程序期望在多個主機URI上進行迭代，但是以某種方式設法在代碼中到達該點，而未檢測到未定義任何內容。

當您使用Mongoid與（較低級別的）Mongo Ruby客戶端進行交互時，此配置文件可能會為您提供一些線索。 您可能還希望參考在Heroku上安裝的任何MongoDB插件的文檔。