Calling other contracts

If your contract method is calling other contracts you will have to add the appropriate Inputs and Outputs to your transaction. For your convenience, the CallHandler provides methods that prepare those inputs and outputs for you. You have two methods that you can use: with_contracts(&[&contract_instance, ...]) and with_contract_ids(&[&contract_id, ...]).

with_contracts(&[&contract_instance, ...]) requires contract instances that were created using the abigen macro. When setting the external contracts with this method, logs and require revert errors originating from the external contract can be propagated and decoded by the calling contract.

    let response = contract_caller_instance
        .methods()
        .increment_from_contract(lib_contract_id, 42)
        .with_contracts(&[&lib_contract_instance])
        .call()
        .await?;

If however, you do not need to decode logs or you do not have a contract instance that was generated using the abigen macro you can use with_contract_ids(&[&contract_id, ...]) and provide the required contract ids.

    let response = contract_caller_instance
        .methods()
        .increment_from_contract(lib_contract_id, 42)
        .with_contract_ids(&[lib_contract_id.clone()])
        .call()
        .await?;