public async Task <IActionResult> GetRelatedContactsByCustomerIdAsync(int customerId)
{
var querySet = _jsonApiBuilder.BuildQuerySet(HttpContext.Request.Query);
var pagedContacts = await _contactManager.GetAllByCustomerIdAsync(customerId, querySet);
var contactDtos = _mapper.Map <IEnumerable <ContactDto> >(pagedContacts.Items, opt => opt.Items["include"] = querySet.Include);
var included = _includedCollector.CollectIncluded(pagedContacts.Items, querySet.Include);
var links = _jsonApiBuilder.BuildCollectionLinks(HttpContext.Request.Path, querySet, pagedContacts);
var meta = _jsonApiBuilder.BuildCollectionMetadata(pagedContacts);
return(Ok(new ResourceResponse()
{
Meta = meta, Links = links, Data = contactDtos, Included = included
}));
}