Enough already. I'm obviously not incentivized/shamed into writing unit tests for things in UNTESTED dir.s. It's just making a mess of the file tree

DataLayer/QueryObjects/LibraryQueries.cs

@@ -0,0 +1,41 @@
+using System.Collections.Generic;
+using System.Linq;
+using Microsoft.EntityFrameworkCore;
+
+namespace DataLayer
+{
+    public static class LibraryQueries
+	{
+		public static List<LibraryBook> GetLibrary_Flat_WithTracking(this LibationContext context)
+			=> context
+				.Library
+				.GetLibrary()
+				.ToList();
+
+		public static List<LibraryBook> GetLibrary_Flat_NoTracking(this LibationContext context)
+            => context
+                .Library
+                .AsNoTracking()
+                .GetLibrary()
+                .ToList();
+
+        public static LibraryBook GetLibraryBook_Flat_NoTracking(this LibationContext context, string productId)
+            => context
+                .Library
+                .AsNoTracking()
+                .GetLibraryBook(productId);
+
+        /// <summary>This is still IQueryable. YOU MUST CALL ToList() YOURSELF</summary>
+        public static IQueryable<LibraryBook> GetLibrary(this IQueryable<LibraryBook> library)
+            => library
+                // owned items are always loaded. eg: book.UserDefinedItem, book.Supplements
+                .Include(le => le.Book).ThenInclude(b => b.SeriesLink).ThenInclude(sb => sb.Series)
+                .Include(le => le.Book).ThenInclude(b => b.ContributorsLink).ThenInclude(c => c.Contributor)
+                .Include(le => le.Book).ThenInclude(b => b.Category).ThenInclude(c => c.ParentCategory);
+
+        public static LibraryBook GetLibraryBook(this IQueryable<LibraryBook> library, string productId)
+            => library
+                .GetLibrary()
+                .SingleOrDefault(le => le.Book.AudibleProductId == productId);
+    }
+}