Polls persist restarts now.

NadekoBot.Core/Services/Database/Repositories/Impl/PollsRepository.cs

@@ -0,0 +1,35 @@
+using NadekoBot.Core.Services.Database.Models;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Microsoft.EntityFrameworkCore;
+
+namespace NadekoBot.Core.Services.Database.Repositories.Impl
+{
+    public class PollsRepository : Repository<Poll>, IPollsRepository
+    {
+        public PollsRepository(DbContext context) : base(context)
+        {
+        }
+
+        public IEnumerable<Poll> GetAllPolls()
+        {
+            return _set.Include(x => x.Answers)
+                .Include(x => x.Votes)
+                .ToArray();
+        }
+
+        public void RemovePoll(int id)
+        {
+            var p = _set
+                .Include(x => x.Answers)
+                .Include(x => x.Votes)
+                .FirstOrDefault(x => x.Id == id);
+            p.Votes.Clear();
+            p.Answers.Clear();
+            _set.Remove(p);
+        }
+    }
+}