How to generate a unique id?

Question

I have a struct which I want to store on the blockchain:

pub struct Item {
  pub id: String,
  pub link: String,
  pub user_address: Pubkey,
}

Now I want to generate an id for it in the Solana program. If I add the UUID package and try to call Uuid::new_v4(), I get the following error.

error: target is not supported, for more information see: https://docs.rs/getrandom/#unsupported-targets

Question: How to generated a UUID in a Solana program? Or alternatively, how to generate a unique identifier of any sort?

Answer 1

Without much context, your best bet may be to use a public key as the id?

let id = Keypair::new().pubkey();

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Though I can imagine that the Item struct is stored in an account. So that accounts' address can already act as the unique id.