ICrudRepository.cs

using BooksWebApi.Entities;
using System.Collections.Generic;
using System.Threading.Tasks;

namespace BooksWebApi.Repository
{
  public interface ICrudRepository
  {
    void Add<T>(T entity) where T : class;
    void Delete<T>(T entity) where T : class;
    Task<bool> SaveAllAsync();  
    IEnumerable<Book> GetBooks();
    Book GetBook(int id);
    IEnumerable<Book> GetBooksByCategory(string category);				
    Category GetCategoryWithBooks(int id);
    User GetUser(string userName);
  }
}