fix: Use type name instead of full type declaration

[cabeedelhertz]

References to other Issues or PRs

Fixes #5678

Have you read the Contributing Guidelines? Yes

Brief description of what is fixed or changed

When using standalone=true, this would end up as response := m.extPackageNamepb.ResponseObject where extPackageNamepb is the import alias for the main proto type package. This resulted in invalid syntax and failed to compile.

Seems to have been introduced here #5510 which went out in the latest release. Noticed this issue when bumping protos, and the registering of my gateway handler failed to compile

Other comments

for reference, current behavior vs with this fix, using the response_body_service.proto example:

Current Behavior

...
import (
	extExamplepb "github.com/grpc-ecosystem/grpc-gateway/v2/examples/internal/proto/examplepb"
)
...
type response_ResponseBodyService_GetResponseBody_0 struct {
	*extExamplepb.ResponseBodyOut
}

func (m response_ResponseBodyService_GetResponseBody_0) XXX_ResponseBody() interface{} {
	response := m.extExamplepb.ResponseBodyOut // the "extExamplepb is the package import which should not be there
	return response.Response
}

New behavior

...
import (
	extExamplepb "github.com/grpc-ecosystem/grpc-gateway/v2/examples/internal/proto/examplepb"
)
...
type response_ResponseBodyService_GetResponseBody_0 struct {
	*extExamplepb.ResponseBodyOut
}

func (m response_ResponseBodyService_GetResponseBody_0) XXX_ResponseBody() interface{} {
	response := m.ResponseBodyOut
	return response.Response
}

[cabeedelhertz]

example of standalone=false, the type defined on line 484 is the type defined in the same package

[cabeedelhertz]

example of standalone=true, the type defined on line 839 is the type defined from the external package, but the reference to the object uses the actual type name because thats how we'd reference it from m

[johanbrandhorst]

Thank you so much for this quick fix! I'll put out a new patch release with this fix as soon as its merged.