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Type: Improvement
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Resolution: Unresolved
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Priority: Major - P3
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None
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Affects Version/s: None
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Component/s: Documentation
A Reddit question about decoding SingleResult suggests that the driver will successfully decode into an empty interface variable.
func GetMonthStatusByID(ctx context.Context, id string) (interface{}, error) { var monthStatus interface{} filter := bson.M{"_id": id} err := db.Collection("Months").FindOne(ctx, filter).Decode(&monthStatus) return monthStatus, err }
It looks like the result might have been a primative.D.
On one hand, this sort of makes sense because any type will satisfy the empty interface. OTOH, it's probably a user being misled by the type signature, as there's no real use for decoding to empty interface versus a concrete type or an Unmarshaler interface.
I think it should either error, on the grounds that users probably made a mistake, or else we should document the behavior to indicate that decoding to empty interface defaults to primative.D.