How to inject instances across the modules with Param/ResultTags?

[voodoo-dn]

Hi.
I'm using go.uber.org/fx v1.20.0.

I wan't to annotate one type with different ResultTags in order to put different instances in container.
Real requirement: gorm DB with master/replica connections

package gorm

func New(logger gormLogger.Interface) (*gorm.DB, error) {
	db, err := gorm.Open(&tests.DummyDialector{}, &gorm.Config{
		DryRun: true,
	})
	if err != nil {
		return nil, errors.WithStack(err)
	}

	db.Logger = logger

	return db, nil
}

I create two gorm.DB instances, but connected to replica and master

package gorm

import "go.uber.org/fx"

var Module = fx.Module(
	"db.gorm",
	fx.Options(
		fx.Provide(
			NewZapWriter,
			NewLogger,
			fx.Annotate(
				New,
				fx.ResultTags(`name:"gorm.master"`),
			),
			fx.Annotate(
				New,
				fx.ResultTags(`name:"gorm.replica"`),
			),
		),
	),
)

I have two repositories, one needs master, another one need replica.

package repository

type ReadMessageRepository struct {
	db *gorm.DB
}

func NewReadMessageRepository(
	db *gorm.DB,
) *ReadMessageRepository {
	return &ReadMessageRepository{
		db: db,
	}
}

type WriteMessageRepository struct {
	db *gorm.DB
}

func NewWriteMessageRepository(db *gorm.DB) *WriteMessageRepository {
	return &WriteMessageRepository{
		db: db,
	}
}

Repositories provided by fx.Module, where I explicitly say: NewWriteMessageRepository expects master gorm.DB, NewReadMessageRepository expected replica gorm.DB

package repository

var Module = fx.Module(
	"message.repository",
	fx.Options(
		fx.Provide(
			fx.Annotate(
				NewWriteMessageRepository,
				fx.ParamTags(`name:"gorm:master"`),
				fx.As(
					new(create.MessageRepository),
				),
			),
			fx.Annotate(
				NewReadMessageRepository,
				fx.ParamTags(`name:"gorm:replica"`),
				fx.As(
					new(list.MessageRepository),
				),
			),
		),
	),
)

Main app looks like:

package app

func NewServerApp(options ...fx.Option) (*fx.App, error) {
	defaultOptions := []fx.Option{
		fx.Provide(
			zap.NewDevelopment,
		),
		gorm.Module, <- returns two instances *gorm.DB with different ResultTags
		messageRepository.Module, <- returns two repositories, expects to inject correct *gorm.DB module
		event_producer.Module,
		command.Module,
		messageHTTP.Module,
		reportHTTP.Module,
		httpServer.Module,
		fx.Invoke(httpServer.RunServer),
	}

	resultOptions := append(defaultOptions, options...)

	return fx.New(resultOptions...), nil
}

When my app starts, it returns error

failed to build create.MessageRepository:
missing dependencies for function "reflect".makeFuncStub
        /opt/homebrew/opt/go/libexec/src/reflect/asm_arm64.s:29:
missing type:
        - *gorm.DB[name="gorm:master"] (did you mean to Provide it?)

Please, help me understand behaviour. Thanks.

[voodoo-dn]

Sorry, problem in tag name. Everything work okay.