Can Dependency Injection be applied based on traits?

[myyrakle]

I tried to implement DI using Extension and Layer.

First, I defined an interface trait for Service and prepared two implementations.

Second, I registered one of the implementations with the layer.

Thirdly, I tried importing a service based on a trait.

But it failed.

Perhaps now, axum's parameter DI seems to perform injection only for exactly matched types.

Is there a workaround for this or a recommended workaround?

I would like to be able to abstract the Service module and separate test versions to make unit testing easier...

[caenguidanos]

Yes, it's possible.

Try with State extractor to ensure correct type checking (it's recommendes from Axum docs).

First, build the Dyn<> type: https://github.com/caenguidanos/http-api-rs/blob/main/src/contexts/ecommerce/backoffice/domain/product/repository.rs.

Then, define the concrete implementation: https://github.com/caenguidanos/http-api-rs/blob/main/src/contexts/ecommerce/common/infrastructure/dependency_container.rs.

Finally, inject with_state on Router https://github.com/caenguidanos/http-api-rs/blob/main/src/contexts/ecommerce/backoffice/infrastructure/controller.rs and extract from handler https://github.com/caenguidanos/http-api-rs/blob/main/src/contexts/ecommerce/backoffice/infrastructure/http/get_products.rs.

[myyrakle]

Thanks for your kind reply!