public BookQuery WithSource(FilterQuery <ExternalSource> q) => Set(x => x.Source = q);
public BookQuery WithIsColor(FilterQuery <bool> q) => Set(x => x.IsColor = q);
public BookQuery WithLanguage(FilterQuery <LanguageType> q) => Set(x => x.Language = q);
public BookQuery WithRating(FilterQuery <MaterialRating> q) => Set(x => x.Rating = q);
public BookQuery WithCategory(FilterQuery <BookCategory> q) => Set(x => x.Category = q);
public ImageQuery WithMediaType(FilterQuery <ImageMediaType> q) => Set(x => x.MediaType = q);