@base.resource(keys.RepoKey)
    def key(self, key_id):
        return keys.RepoKey(self, key_id)
Ensures that a client-provided photo id is valid according
dataset/ETHPy150Open ducksboard/libsaas/libsaas/services/github/repos.py/Repo.key--crossover with--dataset/ETHPy150Open viewfinderco/viewfinder/backend/db/photo.py/Photo.VerifyPhotoId