fix minor bugs in role api

api.go

@@ -181,7 +181,7 @@ func (aH *AccessHandlerAPI) AddRole(c *gin.Context) {
 	}
 
 	// Check if a role with this name already exists
-	if err := aH.dbHandler.Exists(&models.Role{}, "role", role, false); err == nil {
+	if err := aH.dbHandler.Exists(&models.Role{}, "role", role.Role, false); err == nil {
 		aH.logger.Error("AddRole", fmt.Sprintf("role with name %s already exists", role.Role))
 		c.JSON(http.StatusBadRequest, models.NewJsonMessageResponse(fmt.Sprintf("role with name %s already exists", role.Role)))
 	}
@@ -199,25 +199,30 @@ func (aH *AccessHandlerAPI) AddRole(c *gin.Context) {
 func (aH *AccessHandlerAPI) GetRole(c *gin.Context) {
 	var i int
 	var err error
+	var roles []models.Role
 
+	role := c.Query("role")
 	id := c.Query("id")
-	if id != "" {
+
+	if role != "" {
+		err = aH.dbHandler.GetByKey(&roles, "role", role, false)
+	} else if id != "" {
 		i, err = strconv.Atoi(id)
 		if err != nil {
-			aH.logger.Error("GetRole", err)
+			c.JSON(http.StatusBadRequest, gin.H{
-			c.JSON(http.StatusInternalServerError, nil)
+				"message": err.Error(),
+			})
 			return
 		}
+		err = aH.dbHandler.GetById(&roles, uint(i))
 	}
 
-	var role []models.Role
-	err = aH.dbHandler.GetById(&role, uint(i))
 	if err != nil {
 		aH.logger.Error("GetRole", err)
 		c.JSON(http.StatusInternalServerError, nil)
 		return
 	}
-	c.JSON(http.StatusOK, role)
+	c.JSON(http.StatusOK, roles)
 }
 
 func (aH *AccessHandlerAPI) UpdateRole(c *gin.Context) {