Component-oriented-programming/LibraryDatabase/Storages/AuthorStorage.cs

using LibraryContracts.StorageContracts;
using LibraryDatabase;
using LibraryDatabase.Models;
using LibraryDataModels.Dtos;
using LibraryDataModels.Views;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.ConstrainedExecution;
using System.Text;
using System.Threading.Tasks;

namespace LibraryDatabase.Storages
{
	public class AuthorStorage : IAuthorStorage
	{
		public List<AuthorView> GetFullList()
		{
			using var context = new LibraryDatabaseContext();
			return context.Authors
				.Select(x => x.GetView)
				.ToList();
		}

		public AuthorView? GetElement(AuthorDto model)
		{
			using var context = new LibraryDatabaseContext();
			return context.Authors
				.FirstOrDefault(x => x.Id == model.Id)
				?.GetView;
		}

		public AuthorView? Insert(AuthorDto model)
		{
			var newAuthor = Author.Create(model);
			if (newAuthor == null)
			{
				return null;
			}
			using var context = new LibraryDatabaseContext();
			context.Authors.Add(newAuthor);
			context.SaveChanges();
			return newAuthor.GetView;
		}

		public AuthorView? Update(AuthorDto model)
		{
			using var context = new LibraryDatabaseContext();
			var author = context.Authors.FirstOrDefault(x => x.Id == model.Id);
			if (author == null)
			{
				return null;
			}
			author.Update(model);
			context.SaveChanges();
			return author.GetView;
		}

		public AuthorView? Delete(AuthorDto model)
		{
			using var context = new LibraryDatabaseContext();
			var element = context.Authors.FirstOrDefault(rec => rec.Id == model.Id);
			if (element != null)
			{
				context.Authors.Remove(element);
				context.SaveChanges();
				return element.GetView;
			}
			return null;
		}
	}
}