Substrate storage declaration - rust

Question

I'm working on a pallet and after switching to the newest node template it stopped building. Here is declaration
#[derive(Encode, Decode, Clone)]
pub struct VendorData<T :Config>
{
pub vendor : VendorId,
pub owner_account_id : T::AccountId,
}
impl<T:Config> Default for VendorData<T> {
fn default() -> Self {
Self {
vendor : Default::default(),
owner_account_id : Default::default(),
}
}
}
#[pallet::storage]
pub(super) type Vendors<T: Config> = StorageMap<_, Blake2_128Concat, VendorId, VendorData<T>, ValueQuery>;
The cargo build error:
error[E0277]: the trait bound `VendorData<T>: TypeInfo` is not satisfied
...
#[pallet::storage]
^^^^^^^ the trait `TypeInfo` is not implemented for `VendorData<T>`
I've tried declaring struct in a different ways, for example by adding TypeInfo:
#[derive(Encode, Decode, Default, Eq, PartialEq, TypeInfo)]
but every time another errors arise, like this:
error: cannot find macro `format` in this scope
--> /home/psu/.cargo/git/checkouts/substrate-7e08433d4c370a21/352c46a/primitives/consensus/aura/src/lib.rs:50:3
|
50 | app_crypto!(ed25519, AURA);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: consider importing this macro:
scale_info::prelude::format
= note: this error originates in the macro `$crate::app_crypto_public_common_if_std` (in Nightly builds, run with -Z macro-backtrace for more info)
There is another storage item which does not cause errors
pub type Cid = Vec<u8>;
#[pallet::storage]
pub(super) type VendorModels<T: Config> = StorageMap<_, Blake2_128Concat, VendorId, Vec<Cid>, ValueQuery>;
So it seems it's only about storing VendorData struct. Please assist, after hours of experiments and googling I'm lost
UPDATE: after adding TypeInfo to all storage structs declaration the pallet is compiled but a lot of errors like below arised:
error: cannot find macro `format` in this scope
error: cannot find macro `vec` in this scope

Answer 1

You will need to either make sure that all your generic types implement TypeInfo or skip the types explicitly.
Based on this example code in Substrate you could write:
#[derive(Encode, Decode, Clone, TypeInfo)]
#[scale_info(skip_type_params(T))]
pub struct VendorData<T :Config>
{
pub vendor : VendorId,
pub owner_account_id : T::AccountId,
}
Or alternatively the following should work:
#[derive(Encode, Decode, Clone, TypeInfo)]
pub struct VendorData<AccountId>
{
pub vendor : VendorId,
pub owner_account_id : AccountId,
}