error[E0277]: 特征绑定 `NotesDs: Serialize` 不满足

Question

#[derive(BorshSerialize, BorshDeserialize)]
pub struct NotesDs {
    pub own: Vec<String>,
    pub shared: UnorderedMap<AccountId,Vec<String>>,
}

impl NotesDs{
    pub fn new() -> Self {
        assert!(env::state_read::<Self>().is_none(), "Already initialized");
        Self {
            own: Vec:: new(),
            shared: UnorderedMap::new(b"w".to_vec()),
        }
    }
}
#[near_bindgen]
#[derive(BorshDeserialize, BorshSerialize)]
pub struct Note {
    pub note_list : UnorderedMap<AccountId,NotesDs>, 
}

impl Default for Note {
    fn default() -> Self {
        // Check incase the contract is not initialized
        env::panic(b"The contract is not initialized.")
    }
}

#[near_bindgen]
impl Note {
    /// Init attribute used for instantiation.
    #[init]
    pub fn new() -> Self {
        assert!(env::state_read::<Self>().is_none(), "Already initialized");
        Self {
            note_list: UnorderedMap::new(b"h".to_vec()),
        }
    }
    pub fn get_note_list(&mut self, account_id: AccountId) -> NotesDs {
        self.note_list.get(&account_id).unwrap()
    }
}

问题定义

这会导致错误
error[E0277]: the trait bound NotesDs: Serialize is not satisfied
#[near_bindgen] - the trait Serialize is not implemented for 'NotesDs'
note: required because of the requirements on the impl of Serialize for Vec<NotesDs> note: required by a bound in to_vec

Cargo.toml

[package]
name = "test101"
version = "0.1.0"
edition = "2021"

[lib]
crate-type = ["cdylib", "rlib"]

[dependencies]
near-sdk = "3.1.0"
serde_json = "1.0.2"

[profile.release]
codegen-units = 1
opt-level = "z"         
lto = true              
debug = false          
panic = "abort"         
overflow-checks = true

我尝试将序列化和反序列化添加到我的所有结构和枚举中。

主要问题出现在 return 值是 NotesDs 类型时，不是 return 类型的函数工作正常。

我什至尝试在单独的文件中初始化自定义结构并将其导入。但我仍然得到错误。

Answer 1

您使用 #[derive(BorshSerialize, BorshDeserialize)] 在 NotesDs 结构上实现了 Borsh 序列化，并且您正在 returning NotesDs 来自这个合约函数：

pub fn get_note_list(&mut self, account_id: AccountId) -> NotesDs {
    self.note_list.get(&account_id).unwrap()
}

问题是 near-sdk 默认为 JSON 序列化。要对 return 类型使用 Borsh 序列化，请使用 #[result_serializer(borsh)]:

注释函数

#[result_serializer(borsh)]
pub fn get_note_list(&mut self, account_id: AccountId) -> NotesDs {
    self.note_list.get(&account_id).unwrap()
}

See the docs on serialization protocols.

error[E0277]: 特征绑定 `NotesDs: Serialize` 不满足

error[E0277]: the trait bound `NotesDs: Serialize` is not satisfied

rust

smartcontracts

nearprotocol