[Question] ApplyFilter

Hey Guys,

I hope I describe this clearly. I keep having issues with the PagiationQuery and in specific with the ApplyFilterWithoutPagination part.

I’ve made an Contract which has InventoryLines. The code below is the InventoryLinesPaginationQuery

using XVI.Application.Features.InventoryLines.Caching;
using XVI.Application.Features.InventoryLines.DTOs;

namespace XVI.Application.Features.InventoryLines.Queries.Pagination;

public class InventoryLinesWithPaginationQueryByContractId : PaginationFilterBase, ICacheableRequest<PaginatedData<InventoryLineDto>>
{
    [OperatorComparison(OperatorType.Equal)]
    public required int Id { get; set; }

    [CompareTo("ProductName")] // <-- This filter will be applied to Name or Description.
    [StringFilterOptions(StringFilterOption.Contains)]

    public string? Keyword { get; set; }

    public InventoryLineByContractIdListView ListView { get; set; } =
        InventoryLineByContractIdListView.All; //<-- When the user selects a different ListView,

    // a custom query expression is executed on the filter.
    public override string ToString()
    {
        return $"Listview:{ListView},Search:{Keyword},Sort:{Sort},SortBy:{SortBy},{Page},{PerPage}";
    }

    [IgnoreFilter] public string CacheKey => InventoryLineCacheKey.GetPaginationCacheKey($"{this}");
    [IgnoreFilter] public MemoryCacheEntryOptions? Options => InventoryLineCacheKey.MemoryCacheEntryOptions;
}

public class InventoryLinesWithPaginationByContractIdQueryHandler : IRequestHandler<
    InventoryLinesWithPaginationQueryByContractId, PaginatedData<InventoryLineDto>>
{
    private readonly IApplicationDbContext _context;
    private readonly IMapper _mapper;
    private readonly IStringLocalizer<InventoryLinesWithPaginationByContractIdQueryHandler> _localizer;

    public InventoryLinesWithPaginationByContractIdQueryHandler(
        IApplicationDbContext context,
        IMapper mapper,
        IStringLocalizer<InventoryLinesWithPaginationByContractIdQueryHandler> localizer
    )
    {
        _context = context;
        _mapper = mapper;
        _localizer = localizer;
    }

    public async Task<PaginatedData<InventoryLineDto>> Handle(InventoryLinesWithPaginationQueryByContractId request,
        CancellationToken cancellationToken)
    {

        var iQuerybleWithFilter= _context.InventoryLines.Where(x => x.ContractId == request.Id)
            .ApplyFilter(request);
        var resultsWithFilter = iQuerybleWithFilter.ToList(); // Yields 0 results 

        var iQuerableWithoutFilter= _context.InventoryLines.Where(x => x.ContractId == request.Id);
        var resultsWithoutFilter = iQuerableWithoutFilter.ToList(); // Yields 1 result         


        // TODO: Implement InventoryLinesWithPaginationQueryHandler method 
        var data = await _context.InventoryLines.Where(x => x.ContractId == request.Id)
            .ApplyFilterWithoutPagination(request)
            .ProjectTo<InventoryLineDto>(_mapper.ConfigurationProvider)
            .PaginatedDataAsync(request.Page, request.PerPage);
        return data;
    }
}

public class InventoryLinesByContractIdPaginationSpecification : Specification<InventoryLine>
{
    public InventoryLinesByContractIdPaginationSpecification(InventoryLinesWithPaginationQueryByContractId query)
    {
    }
}

public enum InventoryLineByContractIdListView
{
    [Description("All")] All,
}

There is factually 1 InventoryLine where the ContractId Matches the request.id. But why does ApplyFilter (or for that matter ApplyFilterWithoutPagination) take it away? I’m confused. As you can see in the code I cleaned all the filtering code (I had tons more listviews) but deleted them all

Edit: The question is in the handle method

Extra note @neozhu Thank you for your reply on my previous issue. Very warm and welcome.

This project is beautiful and once I learned more I hope I can write a README about the project itself cause I’ve some trouble finding my way trough the project. Its a beautiful setup and I love it tho. But lets say I don’t want caching on a page. Do I delete the code? should I put 0 minutes cache. Should I use a command or should I use a <Name>Query to export data. (Like the log page uses a command and the product page export pdf uses a query). Tho I love learning this project it feels it has everything I ever need for the setup of a cool application!

[neozhu]

Regarding the usage of the toString override, it is primarily used to generate a cache key. When the query conditions are the same, the generated key remains constant, which helps avoid redundant database queries.

If you want to implement more complex condition combinations, I suggest referring to the SearchProductSpecification.cs file. It provides an example of how to handle advanced search criteria.

[Bram1903]

debugged with intellij

Sorry for my absence in replies, but I’m currently on vacation in Norway.

May I ask why you are debugging a .NET project (C#) in a Java based IDE? Of course I understand that you can install plugins to make that work, however I don’t understand why you would choose that over Rider.

Of course it could be that you don’t have all the IDE’s since those subscriptions are quite expensive. Luckily I can still enjoy the student benefits 😊

Nevertheless that still makes me wonder how you prefer an IDE which isn’t natively written for C# over Visual Studio. I find Visual Studio horrible btw, but I find it hard to believe Intelliji with a C# plugin works better than Visual Studio.

Kind regards, Bram