DocumentOrganizer/Diligent.WebAPI.Business/Extensions/FileExtensions.cs

using Diligent.WebAPI.Contracts.DTOs.Files;

namespace Diligent.WebAPI.Business.Extensions
{
    [ExcludeFromCodeCoverage]
    public static class FileExtensions
    {
        public static IQueryable<FileEntity> FilterByExtension(this IQueryable<FileEntity> query, string[]? values)
        {
            if (values == null || values.Length == 0)
                return query;
            return query.Where(n => values.Contains(n.Extension));
        }
        public static IQueryable<FileEntity> FilterByCategory(this IQueryable<FileEntity> query, string[]? values)
        {
            if (values == null || values.Length == 0)
                return query;
            return query.Where(n => values.Contains(n.Category.Name));
        }
        public static IQueryable<FileEntity> FilterByTags(this IQueryable<FileEntity> query, string[]? values)
        {
            if (values == null || values.Length == 0)
                return query;
            //return query.Where(n => values.Any(x => n.Tags.Any(y => y.Name == x)));
            return query.Where(n => n.Tags.Any(x => values.Contains(x.Name)));
        }

        public static IQueryable<FileEntity> FilterFiles(this IQueryable<FileEntity> query, FileFilter filters)
        {
            return query
                .FilterByCategory(filters.Categories)
                .FilterByExtension(filters.Extensions)
                .FilterByTags(filters.Tags);
        }
    }
}