Basically seeking something like this: stable var users : HashMap.HashMap<Principal, UserData> = HashMap.empty(); Where for example type UserData = { principal : Principal; favorite_color : Text; name : Text; favorite_number : Nat; };

[image] pk34: I hope this can help with your main problem (: Thank you, I ended up using this on @skilesare ’s advice elsewhere, which I believe doesn’t require pre-postupgrade: GitHub - ZhenyaUsenko/motoko-hash-map: Stable hash maps for Motoko

Is there a stable type like a HashMap where the key can be of Principal type and the value a custom type?

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skilesare January 18, 2023, 1:47pm 8

Likely yes. I haven’t tested it against that library explicitly, but check this thread: ∞ Day - Origyn Motoko Gift 2 - A Better Map

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Is there a stable type like a HashMap where the key can be of Principal type and the value a custom type?

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