From 9d41963d0598e739c91199af5dd3fec16f82a811 Mon Sep 17 00:00:00 2001
From: WithoutPants <53250216+WithoutPants@users.noreply.github.com>
Date: Thu, 17 Oct 2019 11:56:08 +1100
Subject: [PATCH] Display error when deleting tag used as primary

---
 pkg/models/querybuilder_tag.go | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/pkg/models/querybuilder_tag.go b/pkg/models/querybuilder_tag.go
index e5ed270c6..16a8bcb82 100644
--- a/pkg/models/querybuilder_tag.go
+++ b/pkg/models/querybuilder_tag.go
@@ -1,6 +1,7 @@
 package models
 
 import (
+	"errors"
 	"database/sql"
 	"github.com/jmoiron/sqlx"
 	"github.com/stashapp/stash/pkg/database"
@@ -63,7 +64,17 @@ func (qb *TagQueryBuilder) Destroy(id string, tx *sqlx.Tx) error {
 		return err
 	}
 
-	// does not unset primary_tag_id in scene_markers because it is not nullable
+	// cannot unset primary_tag_id in scene_markers because it is not nullable
+	countQuery := "SELECT COUNT(*) as count FROM scene_markers where primary_tag_id = ?"
+	args := []interface{}{id}
+	primaryMarkers, err := runCountQuery(countQuery, args)
+	if err != nil {
+		return err
+	}
+
+	if primaryMarkers > 0 {
+		return errors.New("Cannot delete tag used as a primary tag in scene markers")
+	}
 
 	return executeDeleteQuery("tags", id, tx)
 }