常见问题

1 user.save 数据能保存进数据库(attr_accessible不能用), 在 Gemfile 中添加  gem "protected attributes"

2 rails console出现错误：Bundler is using a binstub that was created for a different gem.
This is deprecated, in future versions you may need to `bundle binstub rails` to work around a system/bundle conflict.

并且一直启动不了，则

bundle config --delete bin    # Turn off Bundler's stub generator
 rake rails:update:bin         # Use the new Rails 4 executables
 git add bin                   # Add bin/ to source control

解决问题