From d87235a2891e64708a7e617af753e420eb4efa3e Mon Sep 17 00:00:00 2001
From: Aergwyn <aergwyn@t-online.de>
Date: Mon, 27 Nov 2017 20:08:16 +0100
Subject: [PATCH] prevent inserting duplicate metadata

---
 osu.Game/Beatmaps/BeatmapStore.cs | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/osu.Game/Beatmaps/BeatmapStore.cs b/osu.Game/Beatmaps/BeatmapStore.cs
index 3875202e32..ef658d2ff6 100644
--- a/osu.Game/Beatmaps/BeatmapStore.cs
+++ b/osu.Game/Beatmaps/BeatmapStore.cs
@@ -2,6 +2,7 @@
 // Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
 using System;
+using System.Collections.Generic;
 using System.Linq;
 using Microsoft.EntityFrameworkCore;
 using osu.Game.Database;
@@ -32,6 +33,15 @@ namespace osu.Game.Beatmaps
         {
             var context = GetContext();
 
+            foreach (var beatmap in beatmapSet.Beatmaps.Where(b => b.Metadata != null))
+            {
+                var contextMetadata = context.Set<BeatmapMetadata>().Local.SingleOrDefault(e => e.Equals(beatmap.Metadata));
+                if (contextMetadata != null)
+                    beatmap.Metadata = contextMetadata;
+                else
+                    context.BeatmapMetadata.Attach(beatmap.Metadata);
+            }
+
             context.BeatmapSetInfo.Attach(beatmapSet);
             context.SaveChanges();