Bug: Responding to a newdle via the "shareable link" creates a duplicate answer if user was already added on newdle creation

[lucvin]

Hello newdle team, I'm experiencing this issue with the shareable link.
Usually it goes as follows:

• newdle is created with some users added
• invitation email is sent automatically to the users with personalized urls
• newdle creator later sends shareable link to users as a reminder
• user answers trough shareable link and get assigned a personalized url different from the first
• newdle recap shows user twice, one with the answers and one empty

Expected behavior:
using the shareable link should reconcile a user to his personalized url if it was already added to the newdle

[ThiefMaster]

It can only recognize you if you are logged in the second time. There is literally nothing we can do to match two responders afterwards, because just the name is not enough to uniquely identify someone...

The only thing I could imagine is an option to require logging in to answer (which would, in case of CERN newdle, restrict the participants to those with CERN accounts). Because then you will never end up with the case that you answer (again) w/o being logged in nor on your old personalized link.

Alternatively we could put something in localStorage when answering for the first time, and if that exists and you come back, ask if you are $NAME and if you say yes, redirect to that previously saved personal link. Drawback: Someone filling in a newdle on a shared computer...

[lucvin]

I'm experiencing the issue with users that are all logged in but who answer only trough the shareable link instead of the link sent to them on newdle creation.

The users open the link, log in, answer and they get a personalized url different from the one sent to them automatically the first time (that they didn't open), so on the recap you can see them duplicated, 1 for their answer with the shareable link and 1 (still empty) waiting for the answer on the first personalized link