我正在尝试将 rails 4.0.0 与 mongo_mapper 0.12.0 一起使用并收到该消息
Bundler could not find compatible versions for gem "activesupport":
In Gemfile:
mongo_mapper (~> 0.12.0) ruby depends on
activesupport (~> 3.0) ruby
rails (= 4.0.0) ruby depends on
activesupport (4.0.0)
Rails 4 和 mongo_mapper 仍然不兼容?