substrate - 我们如何使用余额托盘而不是系统托盘来存储余额

Question

如果我们查看 polkadot js 文档，我们可以看到以下注释:
这仅在此托盘用于存储余额的情况下使用。
现在我们如何使用余额托盘来存储余额？因为我们还有 api.query.system.account函数代替 api.query.balances.account

Answer 1

您可以在您的框架系统和托盘天平中进行配置 Config特征。
在我们的示例中，我们使用以下内容将天平放置在系统托盘中:

impl frame_system::Config for Runtime {
    /// The basic call filter to use in dispatchable.
    type BaseCallFilter = ();
    /// Block & extrinsics weights: base values and limits.
    type BlockWeights = BlockWeights;
    
    /* -- snip -- */

    /// The data to be stored in an account.
--> type AccountData = pallet_balances::AccountData<Balance>;
    /// Weight information for the extrinsics of this pallet.
    type SystemWeightInfo = ();
    /// This is used as an identifier of the chain. 42 is the generic substrate prefix.
    type SS58Prefix = SS58Prefix;
}

impl pallet_balances::Config for Runtime {
    type MaxLocks = MaxLocks;
    /// The type for recording an account's balance.
    type Balance = Balance;
    /// The ubiquitous event type.
    type Event = Event;
    type DustRemoval = ();
    type ExistentialDeposit = ExistentialDeposit;
--> type AccountStore = System;
    type WeightInfo = pallet_balances::weights::SubstrateWeight<Runtime>;
}

我在相关字段上放了一个箭头。
如果您想将余额存储在余额托盘本身中，您只需将这两行更改为以下内容:

/// Store no extra data in the Balances pallet.
type AccountData = ();

和

use frame_support::traits::StorageMapShim;

...

/// Store the balance information in the Balances pallet.
type AccountStore = StorageMapShim<
    pallet_balances::Account<Runtime>,
    frame_system::Provider<Runtime>,
    AccountId,
    pallet_balances::AccountData<Balance>,
>;