Greetings fellow Movers. Pls lend a helping hand. I wrote a simple module where sender initializes a struct and then transfers it to another address (receiver) for some SUI payment. The code is as below:
#[allow(unused)]
module try::item;
use sui:
:{Self, Coin};
use sui::balance::{Self, Balance};
use sui::sui::SUI;
public struct Item has key, store {
id: UID,
ask: u64,
}
public struct Shop has key {
id: UID,
purse: Balance<SUI>,
}
fun init(ctx: &mut TxContext) {
transfer::transfer(Item {
id: object::new(ctx),
ask: 3000000000,
}, tx_context::sender(ctx));
transfer::share_object(Shop {
id: object::new(ctx),
purse: balance::zero()
});
}
public entry fun burn_item(item: Item) {
let Item { id, ask: \_ } = item;
object::delete(id);
}
public entry fun transfer_item(
shop: &mut Shop,
item: Item,
mysui: &mut Coin<SUI>,
receiver: address,
ctx: &mut TxContext) {
assert!(coin::value(mysui) >= item.ask, 100);
let mysui_bal = coin::balance_mut(mysui);
let payment_bal = balance::split(mysui_bal, item.ask);
balance::join(&mut shop.purse, payment_bal);
transfer::public_transfer(item, receiver);
}
public entry fun collect_payment(
shop: &mut Shop,
ctx: &mut TxContext) {
let payment_val = balance::value(&shop.purse);
let payment_coin = coin::take(&mut shop.purse, payment_val, ctx);
transfer::public_transfer(payment_coin, tx_context::sender(ctx));
}
The problem arises when, in Sui Explorer, I (as sender) try to transfer object Item to the other address (receiver). When I try to do it using the receiver’s wallet, Sui Explorer rewards me with the error below:
For clarity’s sake, we have,
sender address: 0x020073142cedefa9c0e2fa4c101751c3ca1ce0ab940d2f3151b26f8d6876b8d4
receiver address: 0x6ff0266c0f6cd1e53554ea5515ff38f75fae7d3f545dcec4063ac958df1dd55b
object uid: 0x18876657b2be33d9fc791fe68c8dd9b168500ceea3f36485183b7426458b41f8
The error makes perfect sense: Although the required asking price of 3 SUI is coming from the receiver, for the transaction to occur it needs a tiny amount of gas from the sender, and this cannot happen because the Explorer transaction is linked to the receiver’s wallet. I just cannot figure out how to go around this hurdle. Pls offer your insights.
I thank you in advance.
P.S. when transfer_item fun is executed linked with the sender’s wallet everything works. However, this does not correspond to a real life scenario.