Triple Pivot Challenge - php

Question

I have the following challenge, trying to join 3 tables in Laravel 5:
I have a many-to-many relation between 3 table: students, classrooms, terms. I would love to make a call like term->classroom->students.
I saw the Eloquent-triple-pivot package, but unfortunately, I cant get it working for Laravel 5.
Please, I would appreciate solution to bind this and make the call, eloquent or otherwise.
Thank you.
EDIT:
I have many-to-many relationship between 3 tables; classrooms, students, terms.
I have 3 pivot tables: classroom_term, classroom_student, student_term.
And 3 corresponding models: ClassroomTerm, ClassroomStudent, StudentTerm.
My Classroom model:
public function students()
{
return $this->belongsToMany('App\Student')->withTimestamps();
}
public function terms()
{
return $this->belongsToMany('App\Term')->withTimestamps();
}
My Term Model:
public function classrooms()
{
return $this->belongsToMany('App\Classroom')->withTimestamps();
}
public function students()
{
return $this->belongsToMany('App\Student')->withTimestamps();
}
My Student model:
public function terms()
{
return $this->belongsToMany('App\Term')->withTimestamps();
}
public function classrooms()
{
return $this->belongsToMany('App\Classroom')->withTimestamps();
}
What I am doing in my StudentsController is
$term = Term::findOrFail($id);
foreach($term->classrooms as $classroom) {
$studentids = ClassroomStudent::where('classroom_id', '=', $classroom->id)->get();
}
//to get the real student collection
foreach($studentids->student_id as $studentid){
$students = Student::findOrFail($studentid)
}
return view('students.list')->with(['students' => $students]);
In my students.list view, I would simply want to retrieve students:
#foreach($students as $student)
First Name: {{!!$student->first_name!!}}
#endforeach
The error is in this line:
foreach($studentids->student_id as $studentid){
$students = Student::findOrFail($studentid)
}
Undefined property: Illuminate\Database\Eloquent\Collection::$student_id'
However dd($studentids) returned an array and one of the attributes is student_id.
The code is cumbersome and not working.
Thanks for your help
The Goal:
To retrieve the students in the classroom in the term. With many-to-many relationship between classrooms, students and terms.

Answer 1

I think you could be setting the relations not well. Try thinking it well, for example, I think that probably a Student belongsTo a Classroom.
Classroom Model
public function students()
{
return $this->hasMany('App\Student')->withTimestamps();
}
public function terms()
{
return $this->belongsTo('App\Term')->withTimestamps();
}
Term Model:
public function classrooms()
{
return $this->hasMany('App\Classroom')->withTimestamps();
}
Student model:
public function classrooms()
{
return $this->belongsTo('App\Classroom')->withTimestamps();
}

Answer 2

An many to many relation returns an array which it still does when you define the sudentids ->get() also returns an array only ->first() would not return an array but then you do not get all students.
A variable does not turn in an array automatically making your foreach only return the last value.
So to correctly return the values from the students you would most likely get something like this.
Controller:
// Or even bind the term to the url
$term = Term::findOrFail($id);
return view('students.list',compact("term"));
View:
<!-- You could even remove the classroom name/list around it if you purely want to display all students under the term -->
<li>
#foreach($term->classrooms as $classroom) {
<ul>
Classroom: {{ $classroom->name }}
<li>
#foreach($classroom->students as $student)
<ul>
First name: {{ $student->first_name }}
</ul>
#endforeach
</li>
</ul>
#endforeach
</li>
Another simple way to return all students under a term is using the ->whereHas() in your query doing this would be enough
Controller:
$students = Student::whereHas("classrooms",function($q){
$q->whereHas("terms",function($q){
$q->where("id",$termId);
});
})->get();
return view('students.lists',compact("students"));
View:
<li>
#foreach($students as $student)
<ul>
First name: {{ $student->first_name }}
</ul>
#endforeach
</li>
If you want to return specific classrooms within a term or even a user under both you should create 3 controllers one for each of them (only 2 if you do not want to display students separate) and nest your classrooms under terms so you can simply type /terms/1/classrooms/2/ to get the right classroom or /terms/1/classrooms to get all classrooms under a term.