initial chat options implementation

Core/Extensions/RepositoryExtension.ChatOption.cs

@@ -0,0 +1,26 @@
+using System.Threading.Tasks;
+using Kruzya.TelegramBot.Core.Data;
+using Microsoft.EntityFrameworkCore;
+
+namespace Kruzya.TelegramBot.Core.Extensions;
+
+public partial class RepositoryExtension
+{
+    public static async Task<ChatOptionValue> FindOption(this DbSet<ChatOptionValue> repository, long chatId,
+        string optionId)
+    {
+        return await repository.SingleOrDefaultAsync(x => x.ChatId == chatId && x.OptionId == optionId);
+    }
+
+    public static async Task<ChatOptionValue> FindOrCreateOption(this DbSet<ChatOptionValue> repository, long chatId,
+        string optionId)
+    {
+        var opt = await repository.FindOption(chatId, optionId) ?? new ChatOptionValue
+        {
+            ChatId = chatId,
+            OptionId = optionId
+        };
+
+        return opt;
+    }
+}