# Description
- What does this PR do?
While working with `pallet_nfts` through `nonfungibles_v2` traits
`Inspect, Mutate`, I found out that once you have set the collection
attribute with `<Nfts as Mutate>::set_collection_attribute()`, it's not
possible to read it with `<Nfts as Inspect>::collection_attribute()`
since they use different `namespace` values. When setting the attribute,
`AttributeNamespace::Pallet` is used, while
`AttributeNamespace::CollectionOwner` is used when reading.
more context:
https://github.com/freeverseio/laos/issues/7#issuecomment-1766137370
This PR makes `item` an optional parameter in
`Inspect::system_attribute()`, to be able to read collection attributes.
- Why are these changes needed?
To be able to read collection level attributes when reading attributes
of the collection. It will be possible to read collection attributes by
passing `None` for `item`
- How were these changes implemented and what do they affect?
`NftsApi` is also affected and `NftsApi::system_attribute()` now accepts
optional `item` parameter.
## Breaking change
Because of the change in the `NftsApi::system_attribute()` method's
`item` param, parachains who integrated the `NftsApi` need to update
their API code and frontend integrations accordingly. AssetHubs are
unaffected since the NftsApi wasn't released on those parachains yet.
The FRAME development environment provides modules (called "pallets") and support libraries that you can use, modify,
and extend to build the runtime logic to suit the needs of your blockchain.
Dastan
0bcebac4fc