How to extract common named_scopes from ActiveRecord models

I have named_scope which is reused in multiple ActiveRecord models. For example:

  named_scope :limit, lambda {|limit| {:limit => limit}}

What is the best practice to extract this code to be shared across models. Is it possible to extract it to a module or should I rather reopen ActiveRecord::Base class?

ruby-on-rails activerecord named-scope

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How to extract common named_scopes from ActiveRecord models

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