Laravel Eloquent relations (need advice) - mysql

Question

I am having problem with Laravel Eloquent relations i understand how they work but i dont know how to "use" them properly, so i need some guidance/pointers.So here goes.
I have Exam table
Schema looks like (thanks to lukasgeiter)
exams
id
title
duration
questions
id
text
exam_id
answers
id
text
question_id
correct (boolean)
Relations:
Exam Model
public function questions(){
return $this->hasMany('Question');
}
Question Model
public function answers(){
return $this->hasMany('Answer');
}
public function exam(){
return $this->belongsTo('Exam');
}
Answer Model
public function question(){
return $this->belongsTo('Question');
}
And i understand this part but now i want users to be able to solve exam and store that data (i need to save an answer from user, for example user_id 1, exam_id 2, question_id 1, answer true). i have done it this way but i think its wrong (Yeah it does work but i dont think its the right way)
Schema looks like
Users
id
email
pass
...
SolvedExams
id
user_id
exam_id (havent put relation here not sure if needed)
solved (boolean) // if its completed right or wrong
SolvedQuestions
id
exam_id (havent put relation here not sure if needed)
answer(boolean)(then later i check this boolean with answers) //if the answer is right or wrong
Now with relations i have done same as i said before
User Model
public function SolvedExams() {
return $this->hasMany('SolvedExams');
}
SolvedExam model
public function User() {
return $this->belongsToMany('User');
}
public function questions() {
return $this->hasMany('solved');
}
SolvedQuestions model
public function exam() {
return $this->belongsTo('SolvedExam');
}
Is this the right way or am i doing it wrong (and I am a begginer with relations)

Answer 1

I think you are pretty close...
I'd do it this way:
Tables
exams
id, title, duration
questions
id, text, exam_id
answers
id, text, question_id, correct
users
id, email, password
tries
id, user_id, exam_id
answers_try (pivot table)
id, try_id, answer_id
Relations
Exam
public function questions(){
return $this->hasMany('Question');
}
public function tries(){
return $this->hasMany('Try');
}
Question
public function answers(){
return $this->hasMany('Answer');
}
public function exam(){
return $this->hasMany('Exam');
}
Answer
public function question(){
return $this->belongsTo('Question');
}
public function tries(){
return $this->belongsToMany('Try');
}
User
public function tries(){
return $this->hasMany('Try');
}
Try
public function answers(){
return $this->belongsToMany('Answer');
}
public function user(){
return $this->belongsTo('User');
}
public function exam(){
return $this->belongsTo('Exam');
}
Usage
Get the users answer for a question
$answer = User::find(1)
->tries()->where('exam_id', 2)->first()
->answers()->where('question_id', 3)->first();
Creating a new exam
$exam = new Exam;
$exam->save();
$question = new Question;
$question->text = 'Foo?';
$exam->questions()->save($question);
$answer1 = new Answer;
$answer1->text = 'Foo!';
$answer1->correct = true;
$answer2 = new Answer;
$answer2->text = 'Bar!';
$answer2->correct = false;
$question->answers()->saveMany([$answer1, $answer2]);
Saving users answer
$exam = Exam::find(1);
$user = Auth::user();
$try = new Try;
$try->user()->associate($user)->save();
$exam->tries()->save($try);
$try->answers()->attach(2); // 2 is the answer id