LikePost.cs

private static async Task<Ok> Handle([AsParameters] Request request, IBus bus, AppDbContext db, ClaimsPrincipal claimsPrincipal, CancellationToken ct)
{
    var userId = claimsPrincipal.GetUserId();
    var doesLikeExist = await db.Likes.AnyAsync(x => x.PostId == request.Id && x.UserId == userId, ct);
    if (doesLikeExist)
    {
        return TypedResults.Ok();
    }

    var like = new Like
    {
        PostId = request.Id,
        UserId = userId
    };
    await db.Likes.AddAsync(like, ct);

    await db.Posts.Where(x => x.Id == request.Id)
        .ExecuteUpdateAsync(x => x.SetProperty(p => p.LikeCount, p => p.LikeCount + 1), cancellationToken: ct);

    await db.SaveChangesAsync(ct);

    await bus.Publish(new PostLiked(request.Id, userId));

    return TypedResults.Ok();
}