public static IWebHost Seed(this IWebHost host) { var customers = Enumerable .Range(0, 4) .Select(x => { var address = new Address("street", "town", x.ToString()); var customer = new Customer( Guid.NewGuid(), x, new FullName($"First {x}", $"Last {x}"), new Email($"email{x}"), address); var animal = customer.AddAnimal( Guid.NewGuid(), $"Animal {x}", "gender", x, "exterior", address, "No history"); animal.AddJournal( Guid.NewGuid(), DateTime.Now, "findings", "work done", "result", "follow up", "aftercare"); return(customer); }); using (var scope = host.Services.CreateScope()) { var serviceProvider = scope.ServiceProvider; using var context = serviceProvider.GetService <Context>(); context.AddRange(customers); context.SaveChanges(); } return(host); }