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我在使用mongo_mapper运行任何Ruby应用程序时遇到问题。Ruby和mongo_mapper错误
include MongoMapper::Document在我简单的类上升了一个错误：...2.3.1/lib/ruby/gems/2.3.0/gems/mongo_mapper-0.14.0/lib/mongo_mapper/plugins/active_model.rb:9:in <module:ActiveModel>': uninitialized constant ActiveModel::Serializers::Xml (NameError)
我有::加载ActiveModel串行器加载ActiveModel和串行器:: ::的Xml安装宝石。