Favorite/Like system but with only one selection

Hi. I´m trying to create a favorite sistem to choose the player of a match. I have the users collection, the matches collection and a multiple-multiple relationship between them. The problem is that i don´t know how to set that one user only can vote for only one player. I need a little help.
Thanks in advance.

Hello, I’m ready to help you.

Thank you!

Hi @Larguitto ,

It could be similar, you can check this,

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