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我不知道这里发生了什么。我升级到 MOPED 2.0.7，我得到了这个未定义的方法“会话”# 

User.tags_index_collection
 => #<Moped::Collection:0x007fa744fe2c50 @database=#<Mongo::Database:0x70178196887520 name=my_mongo_development>, @name="users_tags_index">

然后根据他们的文档here，我应该能够做到：

User.tags_index_collection.find.entries

但是当我这样做时，我得到

NoMethodError: undefined method `session' for #<Mongo::Database:0x007fa744fe2fc0>
    from /Users/me/.rvm/gems/ruby-2.3.0/gems/moped-2.0.7/lib/moped/query.rb:501:in `session'
    from /Users/me/.rvm/gems/ruby-2.3.0/gems/moped-2.0.7/lib/moped/query.rb:93:in `cursor'
    from /Users/me/.rvm/gems/ruby-2.3.0/gems/moped-2.0.7/lib/moped/query.rb:78:in `each'
    from (irb):8:in `entries'

有任何想法吗？

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