Don't make the total negative

api/purchase.go

@@ -56,7 +56,7 @@ func (a *api) AddPurchase(num int, w http.ResponseWriter, req *http.Request) {
 		Date:      time.Now(),
 		Purchase:  purchase,
 		Type:      "purchase",
-		Total:     -total,
+		Total:     total,
 	}
 	err = a.db.Create(&transaction).Error
 	if err != nil {

api/purchase_test.go

@@ -30,7 +30,7 @@ func TestPurchaseAddListMine(t *testing.T) {
 	if len(transactions) != 1 {
 		t.Fatal("Wrong number of transactions", len(transactions), transactions)
 	}
-	if transactions[0].Total != -testProduct.Price*products[0].Ammount {
+	if transactions[0].Total != testProduct.Price*products[0].Ammount {
 		t.Error("Wrong total:", transactions[0].Total)
 	}
 	if len(transactions[0].Purchase) != 1 {