Unable to merge IQueryable for AsyncCrudAppService GetAll

Hi, I have simple Product AsyncCrudAppService and I’m trying to override GetAll method to exclude duplicates based on property ProductGroupId so I get only one product per group in the result, but I also need to include all products that are not in any group (NULL). I’ve tried things like Concat/Union but these result in strange errors (key cannot be null, AnonymousObject etc).

public override async Task<PagedResultDto<ProductDto>> GetAll(PagedAndSortedResultRequestDto input)
{
    CheckGetAllPermission();

    var query = CreateFilteredQuery(input);

    // 1. One product per group
    query = query.Where(x => x.ProductGroupId != null).GroupBy(x => x.ProductGroupId).Select(x => x.First());

    // 2. Products not belonging to any group
    query = query.Where(x => x.ProductGroupId == null);

    var totalCount = await AsyncQueryableExecuter.CountAsync(query);

    query = ApplySorting(query, input);
    query = ApplyPaging(query, input);

    var entities = await AsyncQueryableExecuter.ToListAsync(query);

    return new PagedResultDto<ProductDto>(
        totalCount,
        entities.Select(MapToEntityDto).ToList()
    );
}

Queries 1 & 2 work well if the other one is commented, but i need to have them both applied so any help with merging them is appreciated.

[acjh]

I know this is irrelevant but there is no such a thing

Regardless of whether there is, you shouldn’t post irrelevant comments on closed issues. Especially when there are other issues that are directly relevant and already answered.

How can I include GrandChildList? Since it is not like EfCore in which we can use Include and ThenInclude

So add a reference to EF Core.

return Repository.GetAll().Include(x => x.ChildList).ThenInclude(t => t.GrandchildList);

[acjh]

Related issue: https://github.com/aspnet/EntityFrameworkCore/issues/11007