RepositoryRestConfiguration now exposes a withCustomEntityLookup() returning an EntityLookupRegistrar that allows to define customizations as follows on Java 8:
config.withCustomEntityLookup()
.forRepository(UserRepository.class)
.withIdMapping(User::getUsername)
.withLookup(UserRepository::findByUsername);
or even abbreviated to:
config.withCustomEntityLookup()
.forRepository(UserRepository.class, User::getUsername, UserRepository::findByUsername);
The API basically takes two lambdas or method references to define the id mapping (User::getUsername in this case) as well as the lookup call based on the repository type with which the customization builder was set up in the first place (UserRepository::findByUsername in this case).
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