CatalogueRepository concrete class

CatalogueRepository.cs

using System.Collections.Generic;
using System.Threading.Tasks;
using BookStore.Domain.CatalogueAggregate;
using Microsoft.EntityFrameworkCore;

namespace BookStore.Repository
{
    class CatalogueRepository : ICatalogueRepository
    {
        private readonly BookStoreDbContext _context;
        public CatalogueRepository(BookStoreDbContext context)
        {
            _context = context;
        }
        public async Task<int> Add(Catalogue entity)
        {
            await _context.Catalogues.AddAsync(entity);
            return 1;
        }

        public async Task<int> Delete(int id)
        {
            var catalogue = await _context.Catalogues.FindAsync(id);
            _context.Catalogues.Remove(catalogue);
            return 1;
        }

        public async Task<Catalogue> Get(int id)
        {
            return await _context.Catalogues.FindAsync(id);
        }

        public async Task<IEnumerable<Catalogue>> GetAll()
        {
            return await _context.Catalogues.ToListAsync();
        }

        public async Task<int> Update(Catalogue entity)
        {            
            var catalogue = await _context.Catalogues.FindAsync(entity);
            this._context.Entry(catalogue).CurrentValues.SetValues(entity);
            return 1;
        }
    }
}