Laravel Eloquent Where Condition from 2 tables - mysql

Question

I have a list of books titles that appear where a user can leave feedback.
I have 2 tables Books table & feedback table.
The tables are for a site where a user gives feedback on a book, once the user has left feedback for that book, I no longer want the book to appear in the book results for that user, there are many users that will be leaving feedback for the same book.
A book can have many feedback
I want to do somthing like if user already left a feedback in the feedback table, then that book they left feedback for should not appear in the results.
I'm not sure how to go about doing this?
my feedback table looks like this:
id
book_id
rating
feedback
user_id
my books table looks like this:
id
user_id
title
I am pulling the books results as follows.
$books = Books::where('user_id', $id)->get();
I need something that will check condition if the user has left feedback for the book yet, then don't show the books the user has already left feedback for in the results.

Answer 1

Just do a query that where the feedback is empty and if its empty it will have a result and if not of course it will not have a result so use if to ask the feedback if its empty
$feedback = Feedback::where('user_id', $id)->get();
$feed = '';
if(!empty($feedback->feedback)){
$feed = $feedback;
}
return view('yourview')->with('feed', $feed);
if you have join table you can do this also. on your upper controller put
use DB;
$feedback = DB::table('feedback as f')
->join('books as b', 'b.id', '=', 'f.book_id')
->join('user as u', 'user.id', '=', 'u.id')
->where('u.id',$id)
->select('u.*','f.*','b.*')->get();
$feed = '';
if(!empty($feedback->feedback)){
$feed = $feedback;
}
return view('yourview')->with('feed', $feed);

Answer 2

Assuming your have relation in your Books Modal like this
public function feedback(){
return $this->hasMany(Feedback::class,'book_id','id');
}
For getting all the books with user id $id which has atleast one feedback your query should be like this
$books = Books::where('user_id', $id)->has('feedback')->get();
If you need more filters you can use whereHas instead of has which will allow you to run more queries.
Update
To get Books that doesn't have feedbacks from user with userid $id will like this.
$books = Books:: whereDoesntHave('feedback',function($q) use($id){
$q->where('user_id',$id);
})->get();
But if you like to get all the books of a user with id $id and also he hasn't and also doesn't have any feedback from him
$books = Books::where('user_id', $id)-> whereDoesntHave('feedback',function($q) use($id){
$q->where('user_id',$id);
})->get();