public async Task UpdateAgesByPersonAsync(
Person person,
CancellationToken cancellationToken)
{
if (person.DateOfBirth == null)
{
return;
}
IEnumerable <MediaFace> faces = await _mediaStore.Faces.GetFacesByPersonAsync(
person.Id,
cancellationToken);
IEnumerable <MediaHeaderData>?medias = await _mediaStore.GetHeaderDataAsync(
faces.Select(x => x.MediaId),
cancellationToken);
ILookup <Guid, MediaHeaderData>?mediaLookup = medias.ToLookup(x => x.Id);
List <UpdateAgeRequest> updates = new();
foreach (MediaFace?face in faces)
{
MediaHeaderData?media = mediaLookup[face.MediaId].Single();
var age = CalculateAge(media.DateTaken, person.DateOfBirth.Value);
updates.Add(new UpdateAgeRequest(face.Id, age));
}
await _mediaStore.Faces.BulkUpdateAgesAsync(updates, cancellationToken);
}