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# development
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billowy-beach-68498

09/02/2016, 2:48 PM
at first there is no AddressMapper but only BuildFileAddressMapper. in https://rbcommons.com/s/twitter/r/4114/, AddressMapper was introduced to serve as a base class for both BuildFileAddressMapper and LegacyAddressMapper. I think the idea is BuildFileAddressMapper is compatible with v1 engine, while LegacyAddressMapper is compatible with v2 engine.