Traits with "#[openbrush::trait_definition]" cannot be referenced

Question

• I want to implement a base contract that multiple contracts should implement.
• I decided to use "#[openbrush::trait_definition]" because "[#ink(message)]" cannot be added in the normal implementation of traits.
• However, traits declared in another library crate cannot be referenced.
• If you remove "#[openbrush::trait_definition]" as a trial, you can refer to it.
• Could you tell me what is wrong?

definition of trait: commons/lib.rs

    #[openbrush::trait_definition]
    pub trait Destination {
        #[ink(message)]
        fn execute_function(&mut self) -> Result<(), ()>;
    }

use of trait: destination_base/lib.rs

#[openbrush::contract]
mod destination_base {
    use commons::Destination;    
    /// 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)]
    pub struct DestinationBase {
        /// Stores a single `bool` value on the storage.
        value: bool,
    }

    impl Destination for DestinationBase {
        #[ink(message)]
        fn execute_function(&mut self) -> Result<(),()> {
            self.flip();
            Ok(())
        }
    }

error:

    Checking destination_base v0.1.0 (/Users/shin.takahashi/develop/work/delegate_test2/contracts/destination_base)
error[E0432]: unresolved import `commons::Destination`
 --> src/lib.rs:9:9
  |
9 |     use commons::Destination;    
  |         ^^^^^^^^^^^^^^^^^^^^ no `Destination` in the root

Answer 1

I have added contract/logics in contracts because your contract/commons is different. I think you have generated this folder using cargo new commons? instead you can use cargo contract new logics command to create new contract. I have fixed your code. Include logics = { path = "../logics", default-features = false, features = ["ink-as-dependency"] } inside dependencies of test/Cargo.toml and include "commons/std" inside std. Aslo don't forgot to add "rlib" to the crate-type options under "cdylib" in your logics/Cargo.toml. I have included github.com repo of the code.

Answer 2

I asked on Element's BrushFam. And "Dominik | Brushfam" told me. To fix this error you need to import everything. As below.

use commons::*;

trait_definition macro generates some code which is then used by the ink_contract so you need to expose that too in order to impl that trait for your contract