Categories facet

FacetExtensions.cs

public static class FacetExtensions
{
    public static ITypeSearch<T> ContentCategoriesFacet<T>(this ITypeSearch<T> request) where T : ICategorizable
    {
        return request.HistogramFacetFor(x => x.Category, 1);
    }

    public static ITypeSearch<T> CategoriesFacet<T>(this ITypeSearch<T> request, Expression<Func<T, object>> fieldExpression) where T : ICategorizable
    {
        return request.HistogramFacetFor(fieldExpression, 1);
    }

    public static IEnumerable<CategoryCount> ContentCategoriesFacet<T>(this IHasFacetResults<T> result) where T : ICategorizable
    {
        return CategoriesFacet(result, x => x.Category);
    }

    public static IEnumerable<CategoryCount> CategoriesFacet<T>(this IHasFacetResults<T> result, Expression<Func<T, object>> fieldExpression) where T : ICategorizable
    {
        HistogramFacet facet = result.HistogramFacetFor(fieldExpression);

        if (facet == null)
        {
            yield break;
        }

        var categoryRepo = ServiceLocator.Current.GetInstance<CategoryRepository>();

        foreach (var value in facet.Entries)
        {
            Category category = categoryRepo.Get(value.Key);

            if (category.IsNotNull())
            {
                yield return new CategoryCount(category, value.Count);
            }
        }
    }
}