ruby-on-rails - Rails 4.0.0 - 获得 "no implicit conversion of nil into String"

Question

刚刚安装了一个全新的 Rails 4.0.0 应用程序，我在 http://0.0.0.0:3000 上遇到了这个错误 (https://gist.github.com/hartator/6404820):

no implicit conversion of nil into String

activerecord (4.0.0) lib/active_record/connection_adapters/sqlite3_adapter.rb:24:in `initialize'
activerecord (4.0.0) lib/active_record/connection_adapters/sqlite3_adapter.rb:24:in `new'
activerecord (4.0.0) lib/active_record/connection_adapters/sqlite3_adapter.rb:24:in `sqlite3_connection'
activerecord (4.0.0) lib/active_record/connection_adapters/abstract/connection_pool.rb:440:in `new_connection'
activerecord (4.0.0) lib/active_record/connection_adapters/abstract/connection_pool.rb:450:in `checkout_new_connection'
activerecord (4.0.0) lib/active_record/connection_adapters/abstract/connection_pool.rb:421:in `acquire_connection'
activerecord (4.0.0) lib/active_record/connection_adapters/abstract/connection_pool.rb:356:in `block in checkout'
/Users/asa/.rvm/rubies/ruby-2.0.0-p195/lib/ruby/2.0.0/monitor.rb:211:in `mon_synchronize'
activerecord (4.0.0) lib/active_record/connection_adapters/abstract/connection_pool.rb:355:in `checkout'
activerecord (4.0.0) lib/active_record/connection_adapters/abstract/connection_pool.rb:265:in `block in connection'
/Users/asa/.rvm/rubies/ruby-2.0.0-p195/lib/ruby/2.0.0/monitor.rb:211:in `mon_synchronize'
activerecord (4.0.0) lib/active_record/connection_adapters/abstract/connection_pool.rb:264:in `connection'
activerecord (4.0.0) lib/active_record/connection_adapters/abstract/connection_pool.rb:546:in `retrieve_connection'
activerecord (4.0.0) lib/active_record/connection_handling.rb:79:in `retrieve_connection'
activerecord (4.0.0) lib/active_record/connection_handling.rb:53:in `connection'

我的数据库.yml:http://pastebin.com/JM5TNmNU

我还没有对 vanilla rails 代码做任何事情。知道可能是什么问题吗？

使用:

• rails 4.0.0
• ruby 2.0.0p195
• 山狮 10.8.2

Answer 1

这听起来像是您的 sqlite3 gem 安装有问题。尝试:

gem pristine sqlite3

来自 RubyGems 文档:

gem pristine

Restores installed gems to pristine condition from files located in the gem cache

Usage

gem pristine [GEMNAME ...] [options]

http://guides.rubygems.org/command-reference/#gem_pristine