Rails working with multiple databases customize the generator | Rails, multiple databases, customize generator

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In ROR working with multiple databases ( Mysql + MongoID or Postgres + MongoId ) for performance is good, but how can i give default generator database to pick-up while generating the models
edit application.rb in config folder and add below code
config.generators do |g|
g.orm             :active_record
end
So every time in next generators will take active record as default for moddels
In case of using mongoid and active record this will be helpful

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