podnoms/server/Services/Auth/UserManagerExtensions.cs

using System.Threading.Tasks;
using System.Linq;
using Microsoft.AspNetCore.Identity;

namespace PodNoms.Api.Services.Auth {
    public static class UserManagerExtensions {
        public static async Task<ApplicationUser> FindBySlugAsync(this UserManager<ApplicationUser> userManager, string slug) {
            var user = await Task.Run(() => userManager.Users.SingleOrDefault(x => x.Slug == slug));
            return user;
        }
        public static async Task<bool> CheckSlug(this UserManager<ApplicationUser> userManager, string slug) {
            var user = await Task.Run(() => userManager.Users.SingleOrDefault(x => x.Slug == slug));
            return (user == null);
        }
    }
}