David Aldridge
David Aldridge
Late to this issue, but while I don't think it's feasible to do this without touching the database, we do something similar by chaining on a call to `#exists?`. ```...
> Does anyone know how to disable it on the Heroku console 😐 > >  You can pass nomultiline as an argument, but need...
That's a good idea. Done.
Yes the real validity test would be both checksum and that the range has been issued by ISBN international. Making the methods `#valid_isbn_13?` and `#valid_isbn_10?`public might be helpful.