【发布时间】：2016-01-03 14:37:39
【问题描述】：
我正在尝试在 Ubuntu 15（64 位）中安装 RoR。我已经完成了大部分安装过程，例如安装 rvm、ruby、mysql 服务器、创建 gemset。
rails new first_app
rvm gemset list
rvm gemset use rails3.2.13
rails new first_app
cd first_app/
bundle install
以上命令执行成功。
Ruby version 2.2.1
Rails version 3.2.13
当我尝试启动服务器时，出现如下错误
rails s
/home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/activesupport-3.2.13/lib/active_support/values/time_zone.rb:270: warning: circular argument reference - now
/home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/bundler-1.11.2/lib/bundler/runtime.rb:80:in `rescue in block (2 levels) in require': There was an error while trying to load the gem 'coffee-rails'. (Bundler::GemRequireError)
from /home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/bundler-1.11.2/lib/bundler/runtime.rb:76:in `block (2 levels) in require'
from /home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/bundler-1.11.2/lib/bundler/runtime.rb:72:in `each'
from /home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/bundler-1.11.2/lib/bundler/runtime.rb:72:in `block in require'
from /home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/bundler-1.11.2/lib/bundler/runtime.rb:61:in `each'
from /home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/bundler-1.11.2/lib/bundler/runtime.rb:61:in `require'
from /home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/bundler-1.11.2/lib/bundler.rb:99:in `require'
from /home/ela/Documents/first_app/config/application.rb:7:in `<top (required)>'
from /home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/railties-3.2.13/lib/rails/commands.rb:53:in `require'
from /home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/railties-3.2.13/lib/rails/commands.rb:53:in `block in <top (required)>'
from /home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/railties-3.2.13/lib/rails/commands.rb:50:in `tap'
from /home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/railties-3.2.13/lib/rails/commands.rb:50:in `<top (required)>'
from script/rails:6:in `require'
from script/rails:6:in `<main>'
我的宝石文件 ::
source 'https://rubygems.org'
gem 'rails', '3.2.13'
# Bundle edge Rails instead:
# gem 'rails', :git => 'git://github.com/rails/rails.git'
gem 'mysql2'
# Gems used only for assets and not required
# in production environments by default.
group :assets do
gem 'sass-rails', '~> 3.2.3'
gem 'coffee-rails', '~> 3.2.1'
# See https://github.com/sstephenson/execjs#readme for more supported runtimes
# gem 'therubyracer', :platforms => :ruby
gem 'uglifier', '>= 1.0.3'
end
gem 'jquery-rails'
'uglifier' gem 也有同样的错误，所以我删除了这 2 个 gem。然后我在 mysql 适配器中遇到错误。
rails s
/home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/activesupport-3.2.13/lib/active_support/values/time_zone.rb:270: warning: circular argument reference - now
=> Booting WEBrick
=> Rails 3.2.13 application starting in development on http://0.0.0.0:3000
=> Call with -d to detach
=> Ctrl-C to shutdown server
Exiting
/home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/bundler-1.11.2/lib/bundler/rubygems_integration.rb:314:in `block in replace_gem': Please install the mysql2 adapter: `gem install activerecord-mysql2-adapter` (can't activate mysql2 (~> 0.3.10), already activated mysql2-0.4.2. Make sure all dependencies are added to Gemfile.) (LoadError)
from /home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/activerecord-3.2.13/lib/active_record/connection_adapters/mysql2_adapter.rb:3:in `<top (required)>'
from /home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `require'
from /home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `block in require'
from /home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:236:in `load_dependency'
from /home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `require'
from /home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_specification.rb:50:in `resolve_hash_connection'
from /home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_specification.rb:41:in `resolve_string_connection'
from /home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_specification.rb:25:in `spec'
from /home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_specification.rb:130:in `establish_connection'
from /home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/activerecord-3.2.13/lib/active_record/railtie.rb:82:in `block (2 levels) in <class:Railtie>'
from /home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/activesupport-3.2.13/lib/active_support/lazy_load_hooks.rb:36:in `instance_eval'
from /home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/activesupport-3.2.13/lib/active_support/lazy_load_hooks.rb:36:in `execute_hook'
from /home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/activesupport-3.2.13/lib/active_support/lazy_load_hooks.rb:43:in `block in run_load_hooks'
from /home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/activesupport-3.2.13/lib/active_support/lazy_load_hooks.rb:42:in `each'
from /home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/activesupport-3.2.13/lib/active_support/lazy_load_hooks.rb:42:in `run_load_hooks'
from /home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/activerecord-3.2.13/lib/active_record/base.rb:720:in `<top (required)>'
from /home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/activerecord-3.2.13/lib/active_record/railtie.rb:88:in `block in <class:Railtie>'
from /home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/railties-3.2.13/lib/rails/initializable.rb:30:in `instance_exec'
from /home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/railties-3.2.13/lib/rails/initializable.rb:30:in `run'
from /home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/railties-3.2.13/lib/rails/initializable.rb:55:in `block in run_initializers'
from /home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/railties-3.2.13/lib/rails/initializable.rb:54:in `each'
from /home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/railties-3.2.13/lib/rails/initializable.rb:54:in `run_initializers'
from /home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/railties-3.2.13/lib/rails/application.rb:136:in `initialize!'
from /home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/railties-3.2.13/lib/rails/railtie/configurable.rb:30:in `method_missing'
from /home/ela/Documents/first_app/config/environment.rb:5:in `<top (required)>'
from /home/ela/Documents/first_app/config.ru:3:in `require'
from /home/ela/Documents/first_app/config.ru:3:in `block in <main>'
from /home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/rack-1.4.7/lib/rack/builder.rb:51:in `instance_eval'
from /home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/rack-1.4.7/lib/rack/builder.rb:51:in `initialize'
from /home/ela/Documents/first_app/config.ru:in `new'
from /home/ela/Documents/first_app/config.ru:in `<main>'
from /home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/rack-1.4.7/lib/rack/builder.rb:40:in `eval'
from /home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/rack-1.4.7/lib/rack/builder.rb:40:in `parse_file'
from /home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/rack-1.4.7/lib/rack/server.rb:200:in `app'
from /home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/railties-3.2.13/lib/rails/commands/server.rb:46:in `app'
from /home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/rack-1.4.7/lib/rack/server.rb:304:in `wrapped_app'
from /home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/rack-1.4.7/lib/rack/server.rb:254:in `start'
from /home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/railties-3.2.13/lib/rails/commands/server.rb:70:in `start'
from /home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/railties-3.2.13/lib/rails/commands.rb:55:in `block in <top (required)>'
from /home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/railties-3.2.13/lib/rails/commands.rb:50:in `tap'
from /home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/railties-3.2.13/lib/rails/commands.rb:50:in `<top (required)>'
from script/rails:6:in `require'
from script/rails:6:in `<main>'
所以我将我的 gem mysql2 gem 版本更改为
rake db:migrate --trace
/home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/activesupport-3.2.13/lib/active_support/values/time_zone.rb:270: warning: circular argument reference - now
============= WARNING FROM mysql2 =============
This version of mysql2 (0.2.24) isn't compatible with Rails 3.1 as the ActiveRecord adapter was pulled into Rails itself.
Please use the 0.3.x (or greater) releases if you plan on using it in Rails >= 3.1.x
============= END WARNING FROM mysql2 =============
** Invoke db:migrate (first_time)
** Invoke environment (first_time)
** Execute environment
** Invoke db:load_config (first_time)
** Execute db:load_config
** Execute db:migrate
rake aborted!
NoMethodError: undefined method `accept' for nil:NilClass
/home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/database_statements.rb:7:in `to_sql'
/home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/database_statements.rb:38:in `select_values'
/home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/activerecord-3.2.13/lib/active_record/migration.rb:587:in `get_all_versions'
/home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/activerecord-3.2.13/lib/active_record/migration.rb:745:in `migrated'
/home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/activerecord-3.2.13/lib/active_record/migration.rb:668:in `current_version'
/home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/activerecord-3.2.13/lib/active_record/migration.rb:685:in `block in migrate'
/home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/activerecord-3.2.13/lib/active_record/migration.rb:685:in `each'
/home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/activerecord-3.2.13/lib/active_record/migration.rb:685:in `detect'
/home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/activerecord-3.2.13/lib/active_record/migration.rb:685:in `migrate'
/home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/activerecord-3.2.13/lib/active_record/migration.rb:570:in `up'
/home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/activerecord-3.2.13/lib/active_record/migration.rb:551:in `migrate'
/home/ela/.rvm/gems/ruby-2.2.1@rails3.2.13/gems/activerecord-3.2.13/lib/active_record/railties/databases.rake:193:in `block (2 levels) in <top (required)>'
/home/ela/.rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/task.rb:240:in `call'
/home/ela/.rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/task.rb:240:in `block in execute'
/home/ela/.rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/task.rb:235:in `each'
/home/ela/.rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/task.rb:235:in `execute'
/home/ela/.rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/task.rb:179:in `block in invoke_with_call_chain'
/home/ela/.rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/monitor.rb:211:in `mon_synchronize'
/home/ela/.rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/task.rb:172:in `invoke_with_call_chain'
/home/ela/.rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/task.rb:165:in `invoke'
/home/ela/.rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/application.rb:150:in `invoke_task'
/home/ela/.rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/application.rb:106:in `block (2 levels) in top_level'
/home/ela/.rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/application.rb:106:in `each'
/home/ela/.rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/application.rb:106:in `block in top_level'
/home/ela/.rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/application.rb:115:in `run_with_threads'
/home/ela/.rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/application.rb:100:in `top_level'
/home/ela/.rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/application.rb:78:in `block in run'
/home/ela/.rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/application.rb:176:in `standard_exception_handling'
/home/ela/.rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/application.rb:75:in `run'
/home/ela/.rvm/rubies/ruby-2.2.1/bin/rake:33:in `<main>'
Tasks: TOP => db:migrate
有人请帮助我。提前致谢。
【问题讨论】：
标签： mysql ruby-on-rails ruby ruby-on-rails-3 ubuntu