Set default database connection Rails

If you don't want to change the config/application.rb you could use this while generating the model:

rails generate active_record:migration

If you change the application.rb file, to invoke a mongoid generator, say for a model 'contacts', one would use:

rails g mongoid:model contacts

(solution link)

Add this to the Application block in config/application.rb:

config.generators do |g|
  g.orm :active_record
end

(found here)

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