Initial efcore migration and updates to make sure upserting novels (mostly) works. still need to do chapter handling

DBConnection/Repositories/NovelRepository.cs

@@ -6,9 +6,32 @@ namespace DBConnection.Repositories;
 
 public class NovelRepository : BaseRepository<Novel>, INovelRepository
 {
-
-    public NovelRepository(AppDbContext dbContext) : base(dbContext)
+    private readonly IAuthorRepository _authorRepository;
+    private readonly ITagRepository _tagRepository;
+    public NovelRepository(AppDbContext dbContext, IAuthorRepository authorRepository, ITagRepository tagRepository) : base(dbContext)
     {
+        _authorRepository = authorRepository;
+        _tagRepository = tagRepository;
+    }
+
+    public override async Task<Novel> Upsert(Novel entity)
+    {
+        var dbEntity = await GetIncluded(entity) ?? entity;
+        dbEntity.Author = await _authorRepository.GetIncluded(entity.Author) ?? entity.Author;
+        List<Tag> newTags = new List<Tag>();
+        foreach (var tag in dbEntity.Tags)
+        {
+            newTags.Add(await _tagRepository.GetIncluded(tag) ?? tag);
+        }
+        dbEntity.Tags.Clear();
+        dbEntity.Tags = newTags;
+        if (DbContext.Entry(dbEntity).State == EntityState.Detached)
+        {
+            DbContext.Add(dbEntity);
+        }
+
+        await DbContext.SaveChangesAsync();
+        return dbEntity;
     }
 
     protected override IQueryable<Novel> GetAllIncludedQueryable()