static Expression <Func <Publisher, bool> > GetFilterCondition(PublisherMaintenanceFilterCondition condition)
{
return(condition switch
{
PublisherMaintenanceFilterCondition.NoFilter => p => true,
PublisherMaintenanceFilterCondition.NoDescription => p => string.IsNullOrEmpty(p.Description),
PublisherMaintenanceFilterCondition.NoBooks => p => p.Books.Count == 0,
PublisherMaintenanceFilterCondition.NoLogoPicture => p => p.LogoPath.Contains("placeholder"),
_ => throw new ArgumentOutOfRangeException(nameof(condition), "Invalid filter condition!")
});
public async Task <IEnumerable <LookupItem> > GetPublisherLookupAsync(string viewModelName,
PublisherMaintenanceFilterCondition publisherMaintenanceFilterCondition = PublisherMaintenanceFilterCondition.NoFilter)
{
var filter = GetFilterCondition(publisherMaintenanceFilterCondition);
await using var ctx = _contextCreator();
return(await ctx.Publishers
.AsNoTracking()
.Where(filter)
.OrderBy(p => p.Name)
.Select(p =>
new LookupItem
{
Id = p.Id,
DisplayMember = p.Name,
Picture = GetPictureThumbnail(p.LogoPath) ?? _placeholderPic,
ViewModelName = viewModelName,
InfoText = $"Books: {p.Books.Count}",
})
.ToListAsync());