so basically I would like to create a functionality where the user adds products to their product list and saves them to the database. I have User entity and Product Entity in one to many relationship. My plan was to get user and check if user is logged in ( if user is not null ) and if it is make him able to create a new product entity and add it to user's Product[] and save it in the database. The problem is that when I wants to add the created product to the list I'm getting ArgumentNullException. How to overcome this? Any tips ?
public class User
{
public int Id { get; set; }
public string UserName { get; set; }
public Product[] Products { get; set; }
}
public class Product
{
public int Id { get; set; }
public string Name { get; set; }
public User User { get; set; }
public int UserId { get; set; }
}
[HttpPost("CreateAndAddProduct")]
public async Task<ActionResult<Product[]>> AddProduct(string User)
{
ProductModel productModel=new ProductModel();
User user= await _context.Users.Where(x=>x.UserName==User).FirstOrDefaultAsync();
Product[] userList = u.Products;
if(user!=null)
{
var product = new Product
{
Name = "gloves",
UserId = user.Id
};
userList.Append(product); // here im getting ArgumentNullException
await _context.SaveChangesAsync();
}
return userList;
}
.Include(x => x.Products)before the.Where()on your query