3

how can i use the complex structure(like Mapping<String, Vec<Map<String, String>>>) in ink!

#![cfg_attr(not(feature = "std"), no_std)]

use ink_lang as ink;

#[ink::contract]
mod mycontract {
    use ink_prelude::string::String;
    use ink_prelude::vec::Vec;
    use ink_storage::{traits::SpreadAllocate, Mapping};


    /// Defines the storage of your contract.
    /// Add new fields to the below struct in order
    /// to add new static storage fields to your contract.
    #[ink(storage)]
    #[derive(SpreadAllocate)]
    pub struct Mycontract {
        /// 存储 key 对应的哈希值
        hash_value_map: Mapping<String, Vec<Mapping<String, String>>>,
    }

    impl Mycontract {

        /// 合约构造器,用于合约的初始化
        #[ink(constructor)]
        pub fn default() -> Self {
            ink_lang::utils::initialize_contract(|_: &mut Self| {})
        }

        #[ink(message)]
        pub fn set_data(&mut self, key_value:String, data:i32) {
            match self.hash_value_map.get(&key_value) {
                None => {

                }
                Some(test) => {

                }
            }
            // match self.hash_value_map.get(&key_value) {
            //     None => {
            //         let mut vec:Vec<i32> = Vec::new();
            //         vec.push(data);
            //         self.hash_value_map.insert(key_value, &vec);
            //     }
            //     Some(mut vec) => {
            //         vec.push(data);
            //         self.hash_value_map.insert(key_value, &vec);
            //     }
            // }
        }
        #[ink(message)]
        pub fn get_data(&self, hash_key: String) -> Result<String,String> {
            // match self.hash_value_map.get(&hash_key) {
            //     None => {
            //         return Err(String::from("DATA_NOT_FOUND"))
            //     }
            //     Some(vec) => {
            //         return Ok(vec)
            //     }
            // };
            return Ok(String::from("Test"))
        }
    }

    /// Unit tests in Rust are normally defined within such a `#[cfg(test)]`
    /// module and test functions are marked with a `#[test]` attribute.
    /// The below code is technically just normal Rust code.
    #[cfg(test)]
    mod tests {
        /// Imports all the definitions from the outer scope so we can use them here.
        use super::*;

        /// Imports `ink_lang` so we can use `#[ink::test]`.
        use ink_lang as ink;

        /// We test if the default constructor does its job.
        #[ink::test]
        fn default_works() {
            let _mycontract = Mycontract::default();
        }
    }
}

i try this, but there are some errors

error[E0599]: the method `get` exists for struct `ink_storage::Mapping<std::string::String, std::vec::Vec<ink_storage::Mapping<std::string::String, std::string::String>>>`, but its trait bounds were not satisfied
  --> lib.rs:30:39
   |
30 |               match self.hash_value_map.get(&key_value) {
   |                                         ^^^ method cannot be called on `ink_storage::Mapping<std::string::String, std::vec::Vec<ink_storage::Mapping<std::string::String, std::string::String>>>` due to unsatisfied trait bounds
   |
   = note: the following trait bounds were not satisfied:
           `std::vec::Vec<ink_storage::Mapping<std::string::String, std::string::String>>: ink_storage::traits::PackedLayout`

For more information about this error, try `rustc --explain E0599`.
error: could not compile `mycontract` due to previous error
Error: Compilation failed with toolchain `nightly-2022-06-30-x86_64-unknown-linux-gnu`

Caused by:
    command failed: "cargo" "check" "--target-dir" "/root/mycontract/target/dylint/target/nightly-2022-06-30-x86_64-unknown-linux-gnu" "--manifest-path" "/root/mycontract/Cargo.toml"
ERROR: `"/root/.rustup/toolchains/nightly-2022-12-24-x86_64-unknown-linux-gnu/bin/cargo" "dylint" "--lib" "ink_linting" "--manifest-path=/root/mycontract/Cargo.toml"` failed with exit code: Some(1)
1
  • mapping inside mapping is not possible in ink! contract. For the solution you can follow this link
    – Ganesh11
    Jun 3, 2023 at 1:53

0

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Browse other questions tagged or ask your own question.