Migrating from cw-storage-plus to storey

This section is a "cheat sheet" to migrating from cw-storage-plus to storey. It's ideal for those who have already used cw-storage-plus. Feel free to use it to migrate your contracts.

Composite keys (tuples)

cw-storage-plus uses tuples to encode composite keys. storey takes a different approach.

In cw-storage-plus, you might use something like Map<(Addr, Token), u128> to store balances for different users and tokens.

In storey, you would use composition: multiple maps within a map, which would look like this: Map<Addr, Map<Token, Item<u128>>>.

Here's a simple example:

use cw_storage_plus::Map;
 
type Address = String;
type Token = String;
 
let balances: Map<(Address, Token), u128> = Map::new("b");
 
balances
    .save(
        &mut storage,
        ("alice".to_string(), "uusd".to_string()),
        &100,
    )
    .unwrap();
 
assert_eq!(
    balances
        .load(&storage, ("alice".to_string(), "uusd".to_string()))
        .unwrap(),
    100
);

For more features and examples, see the map documentation.