public async Task <ActionResult <Customer> > CreateCustomerAsync(CustomerCreateDto customerCreateDto)
{
var customerModel = _mapper.Map <Customer>(customerCreateDto);
await _repository.CreateAsync(customerModel);
await _repository.SaveChangesAsync();
// here we query the customer that we just created in order to load its navigation property
customerModel = await _repository.GetByIdAsync(customerModel.Id);
var customerReadDto = _mapper.Map <CustomerReadDto>(customerModel);
return(CreatedAtRoute(nameof(GetCustomerAsync), new { customerReadDto.Id }, customerReadDto));
}