cw-storage-plus 3.0.1

Enhanced storage engines
Documentation 
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// this module requires iterator to be useful at all
#![cfg(feature = "iterator")]
mod multi;
mod prefix;
mod unique;

pub use multi::MultiIndex;
pub use prefix::IndexPrefix;
pub use unique::UniqueIndex;

use serde::de::DeserializeOwned;
use serde::Serialize;

use cosmwasm_std::{StdResult, Storage};

// Note: we cannot store traits with generic functions inside `Box<dyn Index>`,
// so I pull S: Storage to a top-level
pub trait Index<T>
where
    T: Serialize + DeserializeOwned + Clone,
{
    fn save(&self, store: &mut dyn Storage, pk: &[u8], data: &T) -> StdResult<()>;
    fn remove(&self, store: &mut dyn Storage, pk: &[u8], old_data: &T) -> StdResult<()>;
}

#[cfg(test)]
pub mod test {

    pub fn index_string(data: &str) -> Vec<u8> {
        data.as_bytes().to_vec()
    }

    pub fn index_tuple(name: &str, age: u32) -> (Vec<u8>, u32) {
        (index_string(name), age)
    }

    pub fn index_string_tuple(data1: &str, data2: &str) -> (Vec<u8>, Vec<u8>) {
        (index_string(data1), index_string(data2))
    }
}