public async Task <IActionResult> AddCustomerCollection([FromBody] IEnumerable <CustomerForCreationDto> modelCollection)
{
var customers = _mapper.Map <IReadOnlyList <Customer> >(modelCollection);
var customersAdded = _mapper.Map <IReadOnlyList <CustomerDto> >(await _customerService.AddRangeAsync(customers));
var idsAsString = string.Join(",", customersAdded.Select(c => c.CustomerID));
//return Ok(customersAdded);
return(CreatedAtRoute("GetCustomerCollection",
new { ids = idsAsString },
customersAdded));
}