Second Pull Request - Project Course (ThreadBoard)

I think what Fati meant here is that you have a get() method in class Thread and getByThreadId in Comment which are doing the same thing. Using ``` Thread::get() ``` method is the more logical approach since the getByThreadId() method is not doing what it's supposed to be doing based on how it is named. When we say ``` Comment::getByThreadId() ```, we are getting a comment based on its thread id so the correct query for this should be 
```
SELECT * FROM comment WHERE thread_id = ?;
// instead of 
SELECT * FROM thread WHERE thread_id = ?;
```