Migrate Display Preferences to EF Core

Jellyfin.Server.Implementations/DisplayPreferencesManager.cs

@@ -0,0 +1,49 @@
+using System;
+using System.Linq;
+using Jellyfin.Data.Entities;
+using MediaBrowser.Controller;
+
+namespace Jellyfin.Server.Implementations
+{
+    /// <summary>
+    /// Manages the storage and retrieval of display preferences through Entity Framework.
+    /// </summary>
+    public class DisplayPreferencesManager : IDisplayPreferencesManager
+    {
+        private readonly JellyfinDbProvider _dbProvider;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="DisplayPreferencesManager"/> class.
+        /// </summary>
+        /// <param name="dbProvider">The Jellyfin db provider.</param>
+        public DisplayPreferencesManager(JellyfinDbProvider dbProvider)
+        {
+            _dbProvider = dbProvider;
+        }
+
+        /// <inheritdoc />
+        public DisplayPreferences GetDisplayPreferences(Guid userId, string client)
+        {
+            var dbContext = _dbProvider.CreateContext();
+            var user = dbContext.Users.Find(userId);
+#pragma warning disable CA1307
+            var prefs = user.DisplayPreferences.FirstOrDefault(pref => string.Equals(pref.Client, client));
+
+            if (prefs == null)
+            {
+                prefs = new DisplayPreferences(client, userId);
+                user.DisplayPreferences.Add(prefs);
+            }
+
+            return prefs;
+        }
+
+        /// <inheritdoc />
+        public void SaveChanges(DisplayPreferences preferences)
+        {
+            var dbContext = _dbProvider.CreateContext();
+            dbContext.Update(preferences);
+            dbContext.SaveChanges();
+        }
+    }
+}