54 lines
1.8 KiB
C#
54 lines
1.8 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using DataLayer;
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using InternalUtilities;
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namespace DtoImporterService
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{
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public class LibraryBookImporter : ItemsImporterBase
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{
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public LibraryBookImporter(LibationContext context) : base(context) { }
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public override IEnumerable<Exception> Validate(IEnumerable<ImportItem> importItems) => new LibraryValidator().Validate(importItems.Select(i => i.DtoItem));
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protected override int DoImport(IEnumerable<ImportItem> importItems)
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{
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new BookImporter(DbContext).Import(importItems);
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var qtyNew = upsertLibraryBooks(importItems);
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return qtyNew;
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}
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private int upsertLibraryBooks(IEnumerable<ImportItem> importItems)
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{
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// technically, we should be able to have duplicate books from separate accounts.
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// this would violate the current pk and would be difficult to deal with elsewhere:
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// - what to show in the grid
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// - which to consider liberated
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//
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// sqlite cannot alter pk. the work around is an extensive headache
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// - update: now possible in .net5/efcore5
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//
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// currently, inserting LibraryBook will throw error if the same book is in multiple accounts for the same region.
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//
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// CURRENT SOLUTION: don't re-insert
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var currentLibraryProductIds = DbContext.LibraryBooks.Select(l => l.Book.AudibleProductId).ToList();
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var newItems = importItems.Where(dto => !currentLibraryProductIds.Contains(dto.DtoItem.ProductId)).ToList();
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foreach (var newItem in newItems)
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{
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var libraryBook = new LibraryBook(
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DbContext.Books.Local.Single(b => b.AudibleProductId == newItem.DtoItem.ProductId),
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newItem.DtoItem.DateAdded,
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newItem.AccountId);
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DbContext.LibraryBooks.Add(libraryBook);
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}
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var qtyNew = newItems.Count;
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return qtyNew;
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}
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}
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}
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