Dagger dosn't let me use two objects of the same type in a single class

Question

I have this AppModule class that contains three functions:

@Singleton
@Provides
static FirebaseFirestore provideFirebaseFirestore() {
    return FirebaseFirestore.getInstance();
}

@Singleton
@Provides
static CollectionReference provideUsersCollRef(FirebaseFirestore db) {
    return db.collection("users");
}

@Singleton
@Provides
static CollectionReference provideBarsCollRef(FirebaseFirestore db) {
    return db.collection("bars");
}

I've read that I can use some kind of naming but I didn't find any way to solve this. Beside that, how can I differentiate in my fragment code which one of those reference I inject? Thanks in advance.

---

Edit:

@Inject
@Named("bars")
BarsDataSource(CollectionReference barsRef) {
    this.barsRef= barsRef;
}

Answer 1

That's correct. There is no way for dagger2 to decide which one to provide, right ?

A possible solution is the usage of the @Named annotation. You will have to name them also at @Inject. EG.

@Named("users")
@Singleton
@Provides
static CollectionReference provideUsersCollRef(FirebaseFirestore db) {
    return db.collection("users");
}

@Named("bars")
@Singleton
@Provides
static CollectionReference provideBarsCollRef(FirebaseFirestore db) {
    return db.collection("bars");
}

and

 @Named("bars")
 @Inject
 public CollectionReference bars;

or with constructor injection

@Inject
BarsDataSource(@Named("bars") CollectionReference barsRef) {
    this.barsRef= barsRef;
}