down(migrations_paths, target_version = nil, &block) public

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# File activerecord/lib/active_record/migration.rb, line 767
      def down(migrations_paths, target_version = nil, &block)
        migrations = migrations(migrations_paths)
        migrations.select! { |m| yield m } if block_given?

        self.new(:down, migrations, target_version).migrate
      end
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