Value from Vec inside structure is not equal expected one

Sway
1

Here is the contract that I am trying to run

contract;

pub struct MarketConfiguration {
    foo: u64,
    bar: u64,
    asset_configs: Vec<AssetConfig>,
}

pub struct AssetConfig {
    asset: ContractId,
    decimals: u8,
    blablabla: u64,
}

abi MyContract {
    #[storage(write)]
    fn initialize(config: MarketConfiguration);

    #[storage(read)]
    fn get_asset_config_by_asset_id(asset: ContractId) -> AssetConfig;
}

storage {
    config: Option<MarketConfiguration> = Option::None,
}

#[storage(read)]
fn get_config() -> MarketConfiguration {
    match storage.config {
        Option::Some(c) => c,
        _ => revert(0),
    }
}

#[storage(read)]
fn get_asset_config_by_asset_id_internal(asset: ContractId) -> AssetConfig {
    let mut out: Option<AssetConfig> = Option::None;
    let config = get_config();
    let mut i = 0;
    while i < config.asset_configs.len() {
        let asset_config = config.asset_configs.get(i).unwrap();
        if asset_config.asset == asset {
            out = Option::Some(asset_config);
            break;
        }
        i += 1;
    }
    match out {
        Option::Some(v) => v,
        Option::None(_) => revert(0),
    }
}

impl MyContract for Contract {
    #[storage(write)]
    fn initialize(config: MarketConfiguration) {
        storage.config = Option::Some(config);
    }

    #[storage(read)]
    fn get_asset_config_by_asset_id(asset: ContractId) -> AssetConfig {
        get_asset_config_by_asset_id_internal(asset)
    }
}

And this is method that should help me to get value out of assets_config

but it fails with the next error:

test can_get_contract_id ... FAILED

failures:

---- can_get_contract_id stdout ----
thread 'can_get_contract_id' panicked at 'called `Result::unwrap()` on an `Err` value: RevertTransactionError("Revert(0)", [Call { id: 0000000000000000000000000000000000000000000000000000000000000000, to: 24a5c44cb5bf5deed72e16117d6c0b1b9a78a15dd16f06a1faff48dcb252fb1f, amount: 0, asset_id: 0000000000000000000000000000000000000000000000000000000000000000, gas: 1000000, param1: 4111974, param2: 10472, pc: 11664, is: 11664 }, Revert { id: 24a5c44cb5bf5deed72e16117d6c0b1b9a78a15dd16f06a1faff48dcb252fb1f, ra: 0, pc: 12368, is: 11664 }, ScriptResult { result: Revert, gas_used: 27264 }])', tests/harness.rs:94:10
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace


failures:
    can_get_contract_id

test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.80s

The repo

2

as Vec is a heap type, it cannot be used for persistant storage. Use the StorageVec type from std::storage::StorageVec for persistant vecs. Although this type also has its limitations as only one StorageVec/StorageMap can be used per storage variable (so no nested vecs or multiple vecs in a struct)

3

If you do that, it gives a compilation error.

I just put the vector in the storage and put it next to the config, that’s the solution

4

What is the compilation error?

5 
 --> /Users/alexey/projects/fuel/fuel-project/storage_vec_example/src/main.sw:7:5
  |
5 | 
6 |     bar: u64,
7 |     asset_configs: StorageVec<AssetConfig>,
  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Type StorageVec<AssetConfig> can only be declared directly as a storage field
8 | }
  |
____
6

That does not look like the same code as in the file linked

7

Sorry, I’m decided to move development on
You should checkout to commit 6723abc8db5b456b4b74f726ec762eb349b9c948

8

Checking back here - from the latest on your repo it looks like you resolved this?

9

Yes that is solution

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