脚手架后无法迁移数据库. 2.2节Ruby on Rails教程Michael Hartl

问题描述

我正在研究Hartl rails on rails教程(第2.2节)，并且在迁移数据库时遇到了麻烦.一切似乎都正常，然后我运行了rails generate scaffold User name:string email:string之后，我尝试运行bundle exec rake db:migrate并得到以下错误消息:

I'm working through the Hartl ruby on rails tutorial (section 2.2), and I'm having trouble migrating the database. Everything seemed to be working, and then I ran rails generate scaffold User name:string email:string Afterwards I tried to run bundle exec rake db:migrate and got the below error message:

$ bundle exec rake db:migrate
                                                                                 == 20141125234257 CreateUsers: migrating ======================================
-- create_table(:users)
   -> 0.0079s
== 20141125234257 CreateUsers: migrated (0.0080s) =============================

rake aborted!
StandardError: An error has occurred, this and all later migrations canceled:

wrong number of arguments (1 for 0)/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/connection_adapters/abstract_adapter.rb:271:in `initialize'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/connection_adapters/abstract_adapter.rb:271:in `new'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/connection_adapters/abstract_adapter.rb:271:in `substitute_at'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/relation.rb:97:in `block in substitute_values'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/relation.rb:96:in `each'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/relation.rb:96:in `each_with_index'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/relation.rb:96:in `substitute_values'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/relation.rb:56:in `insert'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/persistence.rb:521:in `_create_record'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/counter_cache.rb:139:in `_create_record'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/attribute_methods/dirty.rb:122:in `_create_record'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/callbacks.rb:306:in `block in _create_record'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activesupport-4.2.0.beta4/lib/active_support/callbacks.rb:88:in `call'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activesupport-4.2.0.beta4/lib/active_support/callbacks.rb:88:in `_run_callbacks'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activesupport-4.2.0.beta4/lib/active_support/callbacks.rb:734:in `_run_create_callbacks'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/callbacks.rb:306:in `_create_record'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/timestamp.rb:57:in `_create_record'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/persistence.rb:501:in `create_or_update'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/callbacks.rb:302:in `block in create_or_update'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activesupport-4.2.0.beta4/lib/active_support/callbacks.rb:88:in `call'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activesupport-4.2.0.beta4/lib/active_support/callbacks.rb:88:in `_run_callbacks'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activesupport-4.2.0.beta4/lib/active_support/callbacks.rb:734:in `_run_save_callbacks'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/callbacks.rb:302:in `create_or_update'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/persistence.rb:142:in `save!'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/validations.rb:42:in `save!'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/attribute_methods/dirty.rb:29:in `save!'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/transactions.rb:289:in `block in save!'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/transactions.rb:345:in `block in with_transaction_returning_status'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/connection_adapters/abstract/database_statements.rb:211:in `transaction'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/transactions.rb:218:in `transaction'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/transactions.rb:342:in `with_transaction_returning_status'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/transactions.rb:289:in `save!'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/persistence.rb:51:in `create!'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/migration.rb:1015:in `record_version_state_after_migrating'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/migration.rb:985:in `block in execute_migration_in_transaction'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/migration.rb:1030:in `block in ddl_transaction'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/connection_adapters/abstract/database_statements.rb:213:in `block in transaction'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/connection_adapters/abstract/transaction.rb:188:in `within_new_transaction'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/connection_adapters/abstract/database_statements.rb:213:in `transaction'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/transactions.rb:218:in `transaction'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/migration.rb:1030:in `ddl_transaction'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/migration.rb:983:in `execute_migration_in_transaction'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/migration.rb:945:in `block in migrate'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/migration.rb:941:in `each'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/migration.rb:941:in `migrate'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/migration.rb:813:in `up'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/migration.rb:791:in `migrate'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/tasks/database_tasks.rb:137:in `migrate'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/railties/databases.rake:44:in `block (2 levels) in <top (required)>'
ArgumentError: wrong number of arguments (1 for 0)
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/connection_adapters/abstract_adapter.rb:271:in `initialize'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/connection_adapters/abstract_adapter.rb:271:in `new'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/connection_adapters/abstract_adapter.rb:271:in `substitute_at'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/relation.rb:97:in `block in substitute_values'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/relation.rb:96:in `each'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/relation.rb:96:in `each_with_index'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/relation.rb:96:in `substitute_values'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/relation.rb:56:in `insert'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/persistence.rb:521:in `_create_record'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/counter_cache.rb:139:in `_create_record'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/attribute_methods/dirty.rb:122:in `_create_record'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/callbacks.rb:306:in `block in _create_record'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activesupport-4.2.0.beta4/lib/active_support/callbacks.rb:88:in `call'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activesupport-4.2.0.beta4/lib/active_support/callbacks.rb:88:in `_run_callbacks'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activesupport-4.2.0.beta4/lib/active_support/callbacks.rb:734:in `_run_create_callbacks'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/callbacks.rb:306:in `_create_record'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/timestamp.rb:57:in `_create_record'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/persistence.rb:501:in `create_or_update'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/callbacks.rb:302:in `block in create_or_update'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activesupport-4.2.0.beta4/lib/active_support/callbacks.rb:88:in `call'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activesupport-4.2.0.beta4/lib/active_support/callbacks.rb:88:in `_run_callbacks'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activesupport-4.2.0.beta4/lib/active_support/callbacks.rb:734:in `_run_save_callbacks'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/callbacks.rb:302:in `create_or_update'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/persistence.rb:142:in `save!'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/validations.rb:42:in `save!'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/attribute_methods/dirty.rb:29:in `save!'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/transactions.rb:289:in `block in save!'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/transactions.rb:345:in `block in with_transaction_returning_status'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/connection_adapters/abstract/database_statements.rb:211:in `transaction'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/transactions.rb:218:in `transaction'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/transactions.rb:342:in `with_transaction_returning_status'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/transactions.rb:289:in `save!'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/persistence.rb:51:in `create!'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/migration.rb:1015:in `record_version_state_after_migrating'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/migration.rb:985:in `block in execute_migration_in_transaction'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/migration.rb:1030:in `block in ddl_transaction'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/connection_adapters/abstract/database_statements.rb:213:in `block in transaction'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/connection_adapters/abstract/transaction.rb:188:in `within_new_transaction'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/connection_adapters/abstract/database_statements.rb:213:in `transaction'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/transactions.rb:218:in `transaction'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/migration.rb:1030:in `ddl_transaction'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/migration.rb:983:in `execute_migration_in_transaction'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/migration.rb:945:in `block in migrate'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/migration.rb:941:in `each'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/migration.rb:941:in `migrate'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/migration.rb:813:in `up'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/migration.rb:791:in `migrate'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/tasks/database_tasks.rb:137:in `migrate'
/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/railties/databases.rake:44:in `block (2 levels) in <top (required)>'
Tasks: TOP => db:migrate
(See full trace by running task with --trace)

我尝试返回到较早的提交，然后再次运行所有内容，但收到相同的错误消息.我是否还应该添加其他文件来帮助解决此问题?

I've tried going back to an earlier commit and running everything again but I get the same error message. Are there any more files that I should add that can help with this?

推荐答案

我也遇到了这个问题.这是由于ActiveRecord 4.2.0.beta4将参数传递给Arel::Nodes::BindParam.new. Arel 6.0.0于今天发布.在此版本中，BindParam在其初始化器中不接受任何参数.

I just ran into this as well. This is due to ActiveRecord 4.2.0.beta4 passing a parameter to Arel::Nodes::BindParam.new. Arel 6.0.0 was just released today. In this version, BindParam does not accept any parameters in it's initalizer.

ActiveRecord已在master分支上解决此问题.在beta5发布之前，您需要将Gemfile锁定为gem 'arel', '6.0.0.beta2'.

ActiveRecord has already fixed this on the master branch. Until beta5 is released you'll need to lock your Gemfile to gem 'arel', '6.0.0.beta2'.

这篇关于脚手架后无法迁移数据库. 2.2节Ruby on Rails教程Michael Hartl的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！