How get data in method from others tables? - laravel-5

Question

This is my simple db schema. Now in my group table i have 'group_A' and 'group_B'. In questions table i have 10 questions 5 for group_A and 5 for group_B. Users table is one user with ID = 1. What i try to do is get data like this:
SELECT answer
FROM answers
JOIN questions q ON (q.id = answer.question_id)
JOIN group g ON (g.id = q.group_id)
WHERE user_id = 1 AND g = 'group_A'
I have model in users class and i would like create method to get answers depend from group:
public function getAnswers($group) {
return $this->hasMany('App\Answers', 'question_id', 'id');
}
How can i get this in that method ? Should i create method group in questions class ?

Answer 1

Not sure about how to define such relation in model which takes input parameter but you could define a scope in your model to get the answers filtered by group like
class Answer extends Model {
public function user()
{
return $this->belongsTo('App\User');
}
public function question()
{
return $this->belongsTo('App\Question');
}
public function scopeGroup($query, $name)
{
return $query->whereHas('question.group', function($q) use($name){
$q->where('name', '=', $name);
});
}
}
I assume in answers model you have defined relationship for question and similarly in question model you have defined relationship for group model.
In query builder you could write it as
$answers = Answer::group('group_A')
->whereHas('user', function($q) use($userid){
$q->where('id', '=', $userid);
})->get();
Or you could apply filter on eager loaded relations as
$users = User::with(['answers' => function($query)
{
$query->whereHas('question.group', function($q){
$q->where('name', '=', 'group_A');
});
}])->get();
If you already have user object you can get answers for specific group as
$answers = $user->answers()
->whereHas('question.group', function($q){
$q->where('name', '=', 'group_A');
})->get();