52 lines
2.3 KiB
C#
52 lines
2.3 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Linq.Expressions;
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using Microsoft.EntityFrameworkCore;
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namespace DataLayer
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{
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// only library importing should use tracking. All else should be NoTracking.
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// only library importing should directly query Book. All else should use LibraryBook
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public static class BookQueries
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{
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public static Book GetBook_Flat_NoTracking(this LibationContext context, string productId)
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=> context
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.Books
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.AsNoTrackingWithIdentityResolution()
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.GetBook(productId);
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public static Book GetBook(this IQueryable<Book> books, string productId)
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=> books
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.GetBooks()
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// 'Single' is more accurate but 'First' is faster and less error prone
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.FirstOrDefault(b => b.AudibleProductId == productId);
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/// <summary>This is still IQueryable. YOU MUST CALL ToList() YOURSELF</summary>
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public static IQueryable<Book> GetBooks(this IQueryable<Book> books, Expression<Func<Book, bool>> predicate)
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=> books
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.GetBooks()
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.Where(predicate);
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/// <summary>This is still IQueryable. YOU MUST CALL ToList() YOURSELF</summary>
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public static IQueryable<Book> GetBooks(this IQueryable<Book> books)
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=> books
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// owned items are always loaded. eg: book.UserDefinedItem, book.Supplements
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.Include(b => b.SeriesLink).ThenInclude(sb => sb.Series)
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.Include(b => b.ContributorsLink).ThenInclude(c => c.Contributor)
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.Include(b => b.Category).ThenInclude(c => c.ParentCategory);
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public static bool IsProduct(this Book book)
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=> book.ContentType is not ContentType.Episode and not ContentType.Parent;
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public static bool IsEpisodeChild(this Book book)
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=> book.ContentType is ContentType.Episode;
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public static bool IsEpisodeParent(this Book book)
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=> book.ContentType is ContentType.Parent;
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public static bool HasLiberated(this Book book)
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=> book.UserDefinedItem.BookStatus is LiberatedStatus.Liberated ||
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book.UserDefinedItem.PdfStatus is not null and LiberatedStatus.Liberated;
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}
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}
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