ruby on rails - Conflicting Mongoid versions with Heroku/MongoHQ -

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i have rails 3.2 app i'm trying going on heroku using mongoid , mongohq , i've found have use different version of mongoid gem local development vs heroku.
here have found;

to app working on heroku , mongohq have use mongoid 2.4.11 app working locally have use mongoid 3.0.0.rc

here errors getting;

mongoid 2.4.10 locally,

undefined class/module moped::

mongoid 3.0.0.rc on heroku/mongohq 

we're sorry, went wrong.

why incompatibility?


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