Solidity mapping multiple items to one user

Question

i'm trying to assign array of items to one user and i want to put address to mapping function and get all items like that:

mapping(address => Item[]) public ownerToItems;

but there is problem with assignment, first time accessing this array will be empty. How example like this should be build?

Answer 1

Try this:

function add(address owner, uint arg1, uint arg2, uint arg3) external {
    ownerToItems[owner].push(Item(arg1, arg2, arg3));
}