Unused Media Slice

unusedmediaslice

using System.Diagnostics;
using System.Linq;
using EPiServer;
using EPiServer.Cms.Shell.UI.Rest.ContentQuery;
using EPiServer.Core;
using EPiServer.DataAbstraction;
using EPiServer.Find;
using EPiServer.ServiceLocation;
using EPiServer.Shell.ContentQuery;
using EPiServer.Shell.Rest;
using EPiServer.Shell.Services.Rest;
using PowerSlice;

namespace Scenarios.Business
{
    [ServiceConfiguration(typeof(IContentQuery)), ServiceConfiguration(typeof(IContentSlice))]
    public class UnusedMediaSlice : ContentSliceBase<MediaData>
    {
        protected IContentRepository ContentRepository;

        public UnusedMediaSlice(IClient searchClient, IContentTypeRepository contentTypeRepository, IContentLoader contentLoader, IContentRepository contentRepository)
            : base(searchClient, contentTypeRepository, contentLoader)
        {
            ContentRepository = contentRepository;
        }

        public override string Name
        {
            get { return "Unused Media"; }
        }

        public override QueryRange<IContent> ExecuteQuery(IQueryParameters parameters)
        {
            var originalContentRange = base.ExecuteQuery(parameters);
            var filteredResults = originalContentRange.Items.Where(IsNotReferenced).ToList();
            
            var itemRange = new ItemRange
            {
                Total = filteredResults.Count,
                Start = parameters.Range.Start,
                End = parameters.Range.End
            };
            
            return new ContentRange(filteredResults, itemRange);
        }

        protected bool IsNotReferenced(IContent content)
        {
            return !ContentRepository.GetReferencesToContent(content.ContentLink, false).Any();
        }
    }
}

Thank you for the code! While using it I found out paging does not work with this slice. Line 39 must be changed to:

Total = originalContentRange.Range.Total,

By using the total from the original query, and not the newly filtered results, you let the UI know that there are more results to page through.