feat: better error messages

server/utils/links.ts

@@ -0,0 +1,34 @@
+import { db } from "#server/db";
+import * as tables from "#server/db/schema";
+import { and, eq, ne } from "drizzle-orm";
+
+const UNIQUE_FIELDS = ["name", "path", "url"] as const;
+type UniqueField = (typeof UNIQUE_FIELDS)[number];
+
+export const joinFields = (fields: string[]): string => {
+  if (fields.length <= 1) return fields.join("");
+  return `${fields.slice(0, -1).join(", ")} and ${fields.at(-1)}`;
+};
+
+export const findConflictingFields = async (
+  values: Partial<Record<UniqueField, string>>,
+  excludeId?: number,
+): Promise<UniqueField[]> => {
+  const conflicts: UniqueField[] = [];
+
+  for (const field of UNIQUE_FIELDS) {
+    const value = values[field];
+    if (!value) continue;
+
+    const conflict = await db.query.links.findFirst({
+      where: and(
+        eq(tables.links[field], value),
+        excludeId !== undefined ? ne(tables.links.id, excludeId) : undefined,
+      ),
+    });
+
+    if (conflict) conflicts.push(field);
+  }
+
+  return conflicts;
+};