/// <summary>
/// 创建订单，涉及到的操作有2个：1. 把购物车中的项中购物车移除； 2.创建一个订单。
/// 这两个操作必须同时完成或失败。
/// </summary>
/// <param name="user"></param>
/// <param name="shoppingCart"></param>
/// <returns></returns>
public Order CreateOrder(User user, ShoppingCart shoppingCart)
{
var order = new Order();
var shoppingCartItems =
_shoppingCartItemRepository.GetAll(
new ExpressionSpecification<ShoppingCartItem>(s => s.ShoopingCart.Id == shoppingCart.Id));
if (shoppingCartItems == null || !shoppingCartItems.Any())
throw new InvalidOperationException("购物篮中没有任何物品");
order.OrderItems = new List<OrderItem>();
foreach (var shoppingCartItem in shoppingCartItems)
{
var orderItem = shoppingCartItem.ConvertToOrderItem();
orderItem.Order = order;
order.OrderItems.Add(orderItem);
_shoppingCartItemRepository.Remove(shoppingCartItem);
}
order.User = user;
order.Status = OrderStatus.Paid;
_orderRepository.Add(order);
_repositoryContext.Commit();
return order;
}
public static UserRole CreateUserRole(User user, Role role)
{
return new UserRole() { UserId = user.Id, RoleId = role.Id };
}
// 将指定的用户从角色中移除。
public void UnassignRole(User user, Role role = null)
{
if (user == null)
throw new ArgumentNullException("user");
Expression<Func<UserRole, bool>> specExpression = null;
if (role == null)
specExpression = ur => ur.UserId == user.Id;
else
specExpression = ur => ur.UserId == user.Id && ur.RoleId == role.Id;
UserRole userRole = _userRoleRepository.GetBySpecification(Specification<UserRole>.Eval(specExpression));
if (userRole == null) return;
_userRoleRepository.Remove(userRole);
_repositoryContext.Commit();
}
// 将指定的用户赋予特定的角色。
public UserRole AssignRole(User user, Role role)
{
if (user == null)
throw new ArgumentNullException("user");
if (role == null)
throw new ArgumentNullException("role");
var userRole = _userRoleRepository.GetBySpecification(Specification<UserRole>.Eval(ur => ur.UserId == user.Id));
if (userRole == null)
{
userRole = UserRole.CreateUserRole(user, role);
_userRoleRepository.Add(userRole);
}
else
{
userRole.RoleId = role.Id;
_userRoleRepository.Update(userRole);
}
_repositoryContext.Commit();
return userRole;
}