add support to update permissions

models/permission.go

@@ -142,3 +142,29 @@ func (p *Permission) PermissionDelete() error {
 
 	return nil
 }
+
+// PermissionUpdate updates an existing permission definition in the database
+func (p *Permission) PermissionUpdate() (*Permission, error) {
+
+	var err error
+
+	log.Printf("PermissionUpdate storing values '%v'\n", p)
+
+	if p.PermissionId == 0 {
+		err = errors.New("PermissionUpdate unable to update permission with empty PermissionId field")
+		log.Printf("PermissionUpdate error in pre-check : '%s'\n", err)
+		return p, err
+	}
+
+	result, err := db.NamedExec((`UPDATE permissions SET Description = :Description, ReadOnly = :ReadOnly, SafeId = :SafeId, UserId = :UserId, GroupId = :GroupId WHERE PermissionId = :PermissionId`), p)
+	if err != nil {
+		log.Printf("PermissionUpdate error executing sql record : '%s'\n", err)
+		return &Permission{}, err
+	} else {
+		affected, _ := result.RowsAffected()
+		id, _ := result.LastInsertId()
+		log.Printf("PermissionUpdate returned result id '%d' affecting %d row(s).\n", id, affected)
+	}
+
+	return p, nil
+}