Attribute Macro frame_support_procedural::storage_prefix

#[storage_prefix]

The optional attribute #[pallet::storage_prefix = "SomeName"] allows you to define the storage prefix to use. This is helpful if you wish to rename the storage field but don’t want to perform a migration.

E.g:

#[pallet::storage]
#[pallet::storage_prefix = "foo"]
#[pallet::getter(fn my_storage)]
pub(super) type MyStorage<T> = StorageMap<Hasher = Blake2_128Concat, Key = u32, Value = u32>;

or

#[pallet::storage]
#[pallet::getter(fn my_storage)]
pub(super) type MyStorage<T> = StorageMap<_, Blake2_128Concat, u32, u32>;