1 files changed, 94 insertions, 0 deletions
diff --git a/Jellyfin.Data/Entities/Libraries/CollectionItem.cs b/Jellyfin.Data/Entities/Libraries/CollectionItem.cs
new file mode 100644
index 000000000..c9306f630
--- /dev/null
+++ b/Jellyfin.Data/Entities/Libraries/CollectionItem.cs
@@ -0,0 +1,94 @@
+using System;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+using Jellyfin.Data.Interfaces;
+
+namespace Jellyfin.Data.Entities.Libraries
+{
+    /// <summary>
+    /// An entity representing a collection item.
+    /// </summary>
+    public class CollectionItem : IHasConcurrencyToken
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="CollectionItem"/> class.
+        /// </summary>
+        /// <param name="collection">The collection.</param>
+        /// <param name="previous">The previous item.</param>
+        /// <param name="next">The next item.</param>
+        public CollectionItem(Collection collection, CollectionItem previous, CollectionItem next)
+        {
+            if (collection == null)
+            {
+                throw new ArgumentNullException(nameof(collection));
+            }
+
+            collection.Items.Add(this);
+
+            if (next != null)
+            {
+                Next = next;
+                next.Previous = this;
+            }
+
+            if (previous != null)
+            {
+                Previous = previous;
+                previous.Next = this;
+            }
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="CollectionItem"/> class.
+        /// </summary>
+        /// <remarks>
+        /// Default constructor. Protected due to required properties, but present because EF needs it.
+        /// </remarks>
+        protected CollectionItem()
+        {
+        }
+
+        /// <summary>
+        /// Gets or sets the id.
+        /// </summary>
+        /// <remarks>
+        /// Identity, Indexed, Required.
+        /// </remarks>
+        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
+        public int Id { get; set; }
+
+        /// <inheritdoc />
+        [ConcurrencyCheck]
+        public uint RowVersion { get; set; }
+
+        /// <summary>
+        /// Gets or sets the library item.
+        /// </summary>
+        /// <remarks>
+        /// Required.
+        /// </remarks>
+        public virtual LibraryItem LibraryItem { get; set; }
+
+        /// <summary>
+        /// Gets or sets the next item in the collection.
+        /// </summary>
+        /// <remarks>
+        /// TODO check if this properly updated dependant and has the proper principal relationship
+        /// </remarks>
+        public virtual CollectionItem Next { get; set; }
+
+        /// <summary>
+        /// Gets or sets the previous item in the collection.
+        /// </summary>
+        /// <remarks>
+        /// TODO check if this properly updated dependant and has the proper principal relationship
+        /// </remarks>
+        public virtual CollectionItem Previous { get; set; }
+
+        /// <inheritdoc />
+        public void OnSavingChanges()
+        {
+            RowVersion++;
+        }
+    }
+}