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git://github.com/reactjs/react-rails.git (at master) is not yet checked out. Run `bundle install` first.

根據https://github.com/bundler/bundler/blob/master/ISSUES.md，解決方是執行以下程式碼，重新安裝 dependencies :

# remove user-specific gems and git repos
rm -rf ~/.bundle/ ~/.gem/bundler/ ~/.gems/cache/bundler/

# remove system-wide git repos and git checkouts
rm -rf $GEM_HOME/bundler/ $GEM_HOME/cache/bundler/

# remove project-specific settings
rm -rf .bundle/

# remove project-specific cached gems and repos
rm -rf vendor/cache/

# remove the saved resolve of the Gemfile
rm -rf Gemfile.lock

# uninstall the rubygems-bundler and open_gem gems
rvm gemset use global # if using rvm
gem uninstall rubygems-bundler open_gem

# try to install one more time
bundle install
Nick Shek1/26/15Less than 1 minuterails
在rails migration改變column type

假設我們要改變sub_anonrums table的title,將其欄位種類由:text改為:string方法如下:

1.在project下新增一個migration file

rails g migration change_sub_anonrums_title_format

2.移除migration 下的change 方法,改為使用up 和down方法,migration file 的source code 如下所示: \

class ChangeSubAnonrumsTitleFormat < ActiveRecord::Migration
  def up
    change_column :sub_anonrums, :title, :string
  end

  def down
    change_column :sub_anonrums, :title, :text
  end
end

3.執行 rake db:migrate

Nick Shek11/26/14Less than 1 minuterails