async Task UpdatePostCache(Blog blog)
{
var dbPosts = await _repo.GetAllPostsAsync(blog.Id);
var cachePosts = await _cache.GetPostsAsync(blog.Id, null);
var updatedPosts = dbPosts.Except(cachePosts.Item ?? new List <Post>());
if (updatedPosts.Count() > 0)
{
await _cache.AddPostsAsync(updatedPosts);
_logger.LogInformation("{service} pdated {count} posts(s)", nameof(BlogCacheProcessingService), updatedPosts.Count());
}
}