New structure (#7)

pkg/models/namespace_users_update.go

@@ -0,0 +1,16 @@
+package models
+
+// Update updates a user <-> namespace relation
+func (nu *NamespaceUser) Update() (err error) {
+
+	// Check if the right is valid
+	if err := nu.Right.isValid(); err != nil {
+		return err
+	}
+
+	_, err = x.
+		Where("namespace_id = ? AND user_id = ?", nu.NamespaceID, nu.UserID).
+		Cols("right").
+		Update(nu)
+	return
+}