utils: force users to implement functions

inveniosoftware / invenio-circulation

Library circulation module for Invenio.

https://invenio-circulation.readthedocs.io

MIT License

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Closed zzacharo closed 5 years ago

zzacharo commented 5 years ago

closes #90

zzacharo commented 5 years ago

@BadrAly Take account this pr for your overlay(although I think you have already implemented your logic :) )