nadekobot/src/NadekoBot/Services/Database/Repositories/Impl/ClubExtensions.cs

using NadekoBot.Core.Services.Database.Models;
using System.Linq;
using Microsoft.EntityFrameworkCore;
using System.Collections.Generic;

namespace NadekoBot.Modules.Xp.Common
{
    public static class ClubExtensions
    {
        private static IQueryable<ClubInfo> Include(this DbSet<ClubInfo> clubs)
            => clubs.Include(x => x.Owner)
                .Include(x => x.Applicants)
                    .ThenInclude(x => x.User)
                .Include(x => x.Bans)
                    .ThenInclude(x => x.User)
                .Include(x => x.Users)
                .AsQueryable();
        public static ClubInfo GetByOwner(this DbSet<ClubInfo> clubs, ulong userId)
            => Include(clubs).FirstOrDefault(c => c.Owner.UserId == userId);
        
        public static ClubInfo GetByOwnerOrAdmin(this DbSet<ClubInfo> clubs, ulong userId)
            => Include(clubs).FirstOrDefault(c => c.Owner.UserId == userId
                                                                || c.Users.Any(u => u.UserId == userId && u.IsClubAdmin));

        public static ClubInfo GetByMember(this DbSet<ClubInfo> clubs, ulong userId)
            => Include(clubs).FirstOrDefault(c => c.Users.Any(u => u.UserId == userId));

        public static ClubInfo GetByName(this DbSet<ClubInfo> clubs, string name, int discrim)
            => Include(clubs).FirstOrDefault(c => c.Name.ToUpper() == name.ToUpper() && c.Discrim == discrim);

        public static int GetNextDiscrim(this DbSet<ClubInfo> clubs, string name)
            => Include(clubs)
                .Where(x => x.Name.ToUpper() == name.ToUpper())
                .Select(x => x.Discrim)
                .DefaultIfEmpty()
                .Max() + 1;

        public static List<ClubInfo> GetClubLeaderboardPage(this DbSet<ClubInfo> clubs, int page)
        {
            return clubs
                .AsNoTracking()
                .OrderByDescending(x => x.Xp)
                .Skip(page * 9)
                .Take(9)
                .ToList();
        }
    }
}