public async Task<Cart> GetCart(string userId, CancellationToken cancellationToken = default(CancellationToken))
{
Serilog.Log.Logger.Debug($"{nameof(GetCart)} for user id '{userId}'");
using (var unitOfWork = this.unitOfWorkFunc())
{
var cart =
await
unitOfWork.Value.Repository<Cart>()
.Get(c => c.CartId == userId)
.SingleOrDefaultAsync(cancellationToken);
if (cart == null)
{
// cart doesn't exist, create it
cart = new Cart { CartId = userId };
unitOfWork.Value.Repository<Cart>().Add(cart);
await unitOfWork.Value.SaveChangesAsync(cancellationToken);
}
else
{
// HACK: .Include(c => c.CartItems.Select(ci => ci.Album)) EF7 doesn't support lazy loading yet and nested includes
// using a loop
cart.CartItems = await unitOfWork.Value.Repository<CartItem>()
.Get(x => x.CartId == cart.CartId, x => x.Album)
.ToListAsync(cancellationToken);
foreach (var cartItem in cart.CartItems)
{
cartItem.Album = await unitOfWork.Value.Repository<Album>()
.Get(a => a.AlbumId == cartItem.AlbumId)
.SingleOrDefaultAsync(cancellationToken);
}
}
return cart;
}
}
public async Task AddToCart(string cartId, Album album, CancellationToken cancellationToken = default(CancellationToken))
{
Serilog.Log.Logger.Debug($"{nameof(this.AddToCart)} album '{album.Title}' for cart with id '{cartId}'");
using (var unitOfWork = this.unitOfWorkFunc())
{
var cartRepository = unitOfWork.Value.Repository<Cart>();
var cartItemsRepository = unitOfWork.Value.Repository<CartItem>();
// check if cart exists and create one if it doesn't
var existingCart = await cartRepository.Get().SingleOrDefaultAsync(c => c.CartId == cartId, cancellationToken);
if (existingCart == null)
{
existingCart = new Cart {CartId = cartId, CartItems = new List<CartItem>()};
cartRepository.Add(existingCart);
}
// Get the matching cart and album instances
var cartItem =
await
cartItemsRepository.Get().SingleOrDefaultAsync(
c => c.CartId == cartId && c.AlbumId == album.AlbumId,
cancellationToken);
if (cartItem == null)
{
// Create a new cart item if no cart item exists
cartItem = new CartItem
{
AlbumId = album.AlbumId,
CartId = cartId,
Count = 1,
DateCreated = DateTime.Now
};
cartItemsRepository.Add(cartItem);
existingCart.CartItems.Add(cartItem);
}
else
{
// If the item does exist in the cart, then add one to the quantity
cartItem.Count++;
}
await unitOfWork.Value.SaveChangesAsync(cancellationToken);
}
}