change error output of startnewevent

api/eventHandler.go

@@ -25,8 +25,7 @@ func (a *APIHandler) StartNewEvent(c *gin.Context) {
 
 	if err := a.DbHandler.StartNewEvent(name); err != nil {
 		a.logger.Error("StartNewEvent", err)
-
-		c.JSON(http.StatusInternalServerError, nil)
+		c.JSON(http.StatusBadRequest, gin.H{"message": err.Error()})
 		return
 	}
 

handlers/events.go

@@ -13,24 +13,28 @@ func (dh *DatabaseHandler) StartNewEvent(name string) error {
 		return errors.New("database not opened")
 	}
 
+	if nil == dh.database.Exists(&models.Event{}, "name", name, false) {
+		return errors.New("event with name: " + name + " exists already")
+	}
+
 	return dh.database.AddNewColum(&models.Event{
 		Name: name,
 		Date: time.Now().Format("2006-01-02 15:04:05"),
 	})
 }
 
-func (dh *DatabaseHandler) GetEvent(id uint) (attendees []models.Event, err error) {
+func (dh *DatabaseHandler) GetEvent(id uint) (event []models.Event, err error) {
 	if !dh.DatabaseOpened() {
-		return attendees, errors.New("database not opened")
+		return event, errors.New("database not opened")
 	}
 
-	err = dh.database.GetById(&attendees, id)
+	err = dh.database.GetById(&event, id)
 	if err != nil {
 		return
 	}
 
-	for i := range attendees {
-		attendees[i].Count = len(attendees[i].Attendees)
+	for i := range event {
+		event[i].Count = len(event[i].Attendees)
 	}
 	return
 }