I was getting this error running the rake db:data:load task: uninitialized constant Rails::DeprecatedConstant::Rails, reading the rails 3 changelog I get realized about this
Railties now deprecates:
RAILS_ROOT in favour of Rails.root,
RAILS_ENV in favour of Rails.env, and
RAILS_DEFAULT_LOGGER in favour of Rails.logger.
本文介绍在升级到 Rails 3 时遇到的常见错误:未初始化常量 Rails::DeprecatedConstant::Rails。通过阅读 Rails 3 的变更日志了解到 Railties 不再支持 RAILS_ROOT,改为使用 Rails.root;RAILS_ENV 替换为 Rails.env;RAILS_DEFAULT_LOGGER 更改为 Rails.logger。
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