Hi everyone, I'm just getting started with writing smart contracts and I'm working on my very first project. I'd love some help with an issue I'm stuck on.

So far, I’ve created a Merchant struct that looks like this:

• id: a unique identifier (UID)
• owner: the address of the merchant
• key: a String used as a unique key
• balance: a u64 representing their balance

I also made a MerchantRegistry struct to manage all merchants:

• id: another UID
• merchant_to_address: an ObjectTable<address, Merchant> mapping addresses to merchants
• merchant_to_key: an ObjectTable<String, Merchant> mapping keys to merchants

I want to be able to look up a merchant either by their address or by their key.

When a user updates their key inside the Merchant struct, the change doesn’t automatically update the key in the merchant_to_key table. That means the old key still points to the merchant, which breaks things.

I tried removing the entry from the table and inserting it back with the new key, but I keep running into errors like:

"Cannot ignore values without drop ability"

I'm pretty sure this is a beginner mistake, but I haven't been able to find a clear explanation or solution anywhere. Is there a proper way to handle updating the key in both the struct and the lookup table?