substrate - 如何在 Substrate 上保存字符串值

Question

我想在基板上保存“字符串”值

起初，我使用“Vec”但它不被 Polkadot JS 识别

我使用“字节”，所以我收到以下错误

我怎么解决这个问题？

请帮我。

使用“字节”作为存储字符串的方式是否正确？

如果正确，我该如何修复下面的错误？

如果不是，正确使用什么？

如果您有示例代码，请告诉我

#[cfg(test)]
mod mock;

#[cfg(test)]
mod tests;

#[derive(Clone, Eq, PartialEq, Default, Encode, Decode, Hash)]
#[cfg_attr(feature = "std", derive(Serialize, Deserialize, Debug))]
pub struct TestData<BlockNumber,Bytes> {
    pub name: Bytes,                                                                                                                                                                    
    pub address: Bytes,
}
pub type TestDataOf<T> = TestData<primitives::Bytes>;
--snip--
// This pallet's storage items.
decl_storage! {
    // It is important to update your storage name so that your pallet's
    // storage items are isolated from other pallets.
    // ---------------------------------vvvvvvvvvvvvvv
    trait Store for Module<T: Trait> as TemplateModule {
        pub TestDatas: map hasher(blake2_128_concat) T::AccountId => Option<TestDataOf<T>>;
    }
}
--snip--
decl_module! {
    /// The module declaration.
    pub struct Module<T: Trait> for enum Call where origin: T::Origin {
        // Initializing errors
        // this includes information about your errors in the node's metadata.
        // it is needed only if you are using errors in your pallet
        type Error = Error<T>;

        // Initializing events
        // this is needed only if you are using events in your pallet
        fn deposit_event() = default;


        /// regist public data
        #[weight = 10_000]
        pub fn register_test_data(origin, name:Bytes, address:Bytes) -> dispatch::DispatchResult {
            let registerer = ensure_signed(origin)?;
            let test_data = TestDataOf::<T> {
                name,
                address,
            };
            <TestDatas<T>>::insert(&registerer, test_data);
            Ok(())
        }
    }
}
--snip--

错误是...

the trait `_::_parity_scale_codec::Encode` is not implemented for `TestData<substrate_primitives::Bytes>`
the trait `_::_parity_scale_codec::Decode` is not implemented for `TestData<substrate_primitives::Bytes>`
the trait `_::_parity_scale_codec::WrapperTypeEncode` is not implemented for `substrate_primitives::Bytes`

Answer 1

您应该使用 Vec<u8>将任意字节存储在运行时存储中，如字符串。
访问 Vec<u8> 时这是 Polkadot JS 中的字符串，您应该使用类型 Text ，它会自动处理解析并将此类型转换为常规 UTF-8 文本。
例子:
锈:

pub struct TestData {
    pub name: Vec<u8>,                                                                                                                                                                    
    pub address: Vec<u8>,
}

Polkadot JS 类型定义:

TestData: {
    name: 'Text',
    address: 'Text'
}

如果这有帮助，或者您有其他问题，请告诉我。