scope_validators.rb

module ScopeValidators
  extend ActiveSupport::Concern
  
  module ClassMethods
    def validates(*args)
      options = args.extract_options!
      if options.key?(:uniqueness)
        case options[:uniqueness]
        when Hash
          options[:uniqueness].merge!(scope: :entity_id)
        when TrueClass
          options[:uniqueness] = { scope: :entity_id }
        end
      end
      super(*args, options)
    end
  end
end