added error returns

database.go

@@ -59,7 +59,7 @@ func (db *FirestoreDatabase) AddReview(r *Review) (string, error) {
 	_, err := ref.Set(db.Ctx, r)
 	if err != nil {
 		fmt.Println("ERROR saving review to Firestore DB: ", err)
-		return "", nil
+		return "", errors.New("Could not add review")
 	}
 	return r.ID, nil
 }
@@ -84,6 +84,9 @@ func (db *FirestoreDatabase) GetAll() ([]Review, error) {
 		}
 		request = append(request, reviewData)
 	}
+	if len(request) == 0 {
+		return []Review{}, errors.New("Could not get all reviews")
+	}
 	return request, nil
 }
 
@@ -108,6 +111,9 @@ func (db *FirestoreDatabase) GetByID(id string) ([]Review, error){
 		}
 		request = append(request, reviewData)
 	}
+	if len(request) == 0 {
+		return []Review{}, errors.New("Could not get review by id")
+	}
 	return request, nil
 }
 
@@ -118,6 +124,7 @@ func (db *FirestoreDatabase) DeleteByTurID(id string) error{
 	_, err := docRef.Delete(db.Ctx)
 	if err != nil {
 		fmt.Printf("Error: %v\n", err)
+		return errors.New("Could not delete review")
 	}
 
 	return nil