ErsatzTV/ErsatzTV.Infrastructure/Extensions/ConfigElementQueryableExtensions.cs

using System;
using System.Linq;
using System.Threading.Tasks;
using ErsatzTV.Core.Domain;
using LanguageExt;

namespace ErsatzTV.Infrastructure.Extensions
{
    public static class ConfigElementQueryableExtensions
    {
        public static Task<Option<T>> GetValue<T>(
            this IQueryable<ConfigElement> configElements,
            ConfigElementKey key) =>
            configElements
                .SelectOneAsync(ce => ce.Key, ce => ce.Key == key.Key)
                .MapT(ce => (T) Convert.ChangeType(ce.Value, typeof(T)));
    }
}