init

Repositories/BookRepository.cs

@@ -0,0 +1,70 @@
+using System;
+using example_app.Database.Connector;
+using example_csharp_app.Dto;
+using example_csharp_app.Interfaces;
+using Microsoft.EntityFrameworkCore;
+using System.Linq;
+using example_csharp_app.Models.Request;
+
+namespace example_csharp_app.Repositories;
+
+public class BookRepository : IBookRepository
+{
+    private readonly AppDbContext _dbContext;
+
+    public BookRepository(AppDbContext dbContext)
+    {
+        _dbContext = dbContext;
+    }
+
+    public async Task<int> AddBookAsync(BookDto dto)
+    {
+        _dbContext.Add(dto);
+        return await _dbContext.SaveChangesAsync();
+    }
+
+    public async Task<BookDto?> GetBookAsync(Guid bookId, bool enableEdit = true)
+    {
+        var query = _dbContext.Books.Where(x => x.Id == bookId);
+        if(enableEdit == false)
+        {
+            query = query.AsNoTracking();
+        }
+        return await query.FirstOrDefaultAsync();
+    }
+
+    public async Task<IReadOnlyCollection<BookDto>> GetBookListAsync(BookFilterRequest request)
+    {
+        IQueryable<BookDto> query = _dbContext.Books.AsNoTracking();
+        if(request.Author != null)
+        {
+            query = query.Where(x => x.Author.Contains(request.Author));
+        }
+        if(request.Title != null)
+        {
+            query = query.Where(x => x.Title.Contains(request.Title));
+        }
+        if(request.Index != null)
+        {
+            var interminentQuery = await query.ToListAsync();
+            return interminentQuery.Where(x => x.BookIndex.Contains(request.Index)).ToList(); // ничего лучше не придумал
+            // xml ~~ xml - operation does not exist
+            //query = query.Where(x => x.BookIndex.Contains(request.Index));
+        }
+
+        return await query.ToListAsync(); // можно возвращать query как IEnumerable, но в некоторых случаях это будет приводить к исключению
+                                            // например если контекст инжектится фабрикой
+    }
+
+    public async Task<int> RemoveBookAsync(BookDto dto)
+    {
+        _dbContext.Books.Remove(dto);
+        return await _dbContext.SaveChangesAsync();
+    }
+
+    public async Task<int> UpdateBookAsync(BookDto dto)
+    {
+        _dbContext.Books.Update(dto);
+        return await _dbContext.SaveChangesAsync();
+    }
+}