You can use this

users
-----
id
name
...

questions
---------
id
title
answers
...

user_answers
------------
id
question_id
answers ( this answers user will compare with table question field answers )
user_id

or this

users
-----
id
name
...

questions
---------
id
title
...

answers
-------
id
question_id
answers

user_answers
------------
id
question_id
answers ( this answers user will compare with table answers field answers )
user_id

Now I have this but not sure if relationships are correct. How can I update or insert if answers are nor exist in my answer_user table?

• users:
  • id
  • username
• questions:
  • id
  • title
• answers:
  • id
  • question_id
  • text
• answer_user:
  • id
  • user_id
  • question_id
  • answer_id

class Question extends Model
{

    public function answer()
    {
        return $this->hasMany('App\Answer');
    }
}

class Answer extends Model
{

    public function question()
    {
        return $this->belongsTo('App\Question');
    }

}
class User extends Authenticatable
{
    public function answers()
    {
        return $this->belongsToMany('App\Answer');
    }
}

Anyone can help me for the correct relationship please?