Laravel QueryBuilder to Eloquent Relationship - laravel

Question

Updated:
I'm almost getting my result, I'd just like to filter the "current" student I'm looking for
My updated model:
// Student.php
public function enrolled()
{
return $this->belongsToMany('App\Classroom', 'inscribed_students')
->with('enrolled_steps.student_process')
->whereRaw('start_at >= curdate()');
}
// Classroom.php
public function enrolled_steps()
{
return $this->hasMany('App\InscribedStudent');
}
// InscribedStudent.php
public function student_process()
{
return $this->hasMany('App\StudentSelectionProcess');
}
My output json:
{
"id": 1,
"name": "This is a Student",
"email": "dborer#example.org",
"enrolled": [
{
"id": 31,
"name": "This is a Classroom",
"shift": "Morning",
"enrolled_steps: [
{
"id": 1,
"student_id": 1,
"classroom_id": 1,
"student_process": [
{
"id": 1,
"status": "Approved"
}
]
},
{
"id": 2,
"student_id": 2,
"classroom_id": 1,
"student_process": [
{
"id": 2,
"status": "Approved"
}
]
},
]
}
]
}
The current problem is the enrolled_steps are return a array, but im filter one student, how can I fix it to get only my current student?
My expected output:
{
"id": 1,
"name": "This is a Student",
"email": "dborer#example.org",
"enrolled": [
{
"id": 31,
"name": "This is a Classroom",
"shift": "Morning",
"enrolled_steps: {
"id": 1,
"student_id": 1,
"classroom_id": 1,
"student_process": [
{
"id": 1,
"status": "Approved"
}
]
}
}
]
}
Question:
My problem is I have to do multiple/hard relationship to show info about student.
+--------------------+
| Student |
+--------------------+
| id |
| name |
| email |
+--------------------+
+--------------------+
| Classroom |
+--------------------+
| id |
| name |
| shift |
+--------------------+
+--------------------+
| InscribedStudent |
+--------------------+
| id |
| student_id | << Foreign key
| classroom_id | << Foreign key
+--------------------+
+--------------------+
| SelectionProcess |
+--------------------+
| id |
| classroom_id | << Foreign key
| enabled |
+--------------------+
+-------------------------+
| StudentSelectionProcess |
+-------------------------+
| id |
| inscribed_student_id | << Foreign key
| selection_process_id | << Foreign key
| status |
+-------------------------+
My QueryBuilder
$student = DB::table('students')
->join('inscribed_students', 'inscribed_students.student_id', '=', 'students.id')
->join('classrooms', 'classrooms.id', '=', 'inscribed_students.classroom_id')
->join('selection_processes', 'selection_processes.classroom_id', '=', 'classrooms.id')
// If exists show, else null
->leftjoin('student_selection_processes', 'student_selection_processes.selection_process_id', '=', 'selection_processes.id')
->select('students.*', 'classrooms.*', 'student_selection_processes.*')
->where([
['selection_processes.enabled', 1], // Very important
['students.id', $id]
])
->first();
But I consider the way very messy and still need to rearrange for the resource, so I want know if is possible to convert this Query to Eloquent relationship.
My expected eloquent json result
{
"id": 1,
"name": "This is a Student",
"email": "dborer#example.org",
"enrolled": [
{
"id": 31,
"name": "This is a Classroom",
"shift": "Morning",
"process: {
"id": 5,
"status": "Approved"
}
}
]
}
I can get at the classrooms but I don't know how can I get the process
// StudentController.php - Student controller
$student = Student::with(['enrolled'])
->find($id);
// Student.php - Student Model
public function enrolled()
{
return $this->belongsToMany('App\Classroom', 'inscribed_students');
}
If possible, if student_selection_processes is null don't show the related classroom

Answer 1

I am not fully understanding what you are after, however, something like this might help:
Student::with(['classroom', 'classroom.selectionProcess', 'classroom.selectionProcess.StudentSelectionProcess'])
->having(['classroom.selectionProcess.StudentSelectionProcess'])
->find($id);
Have a look at nested eager loading in Laravel Docs: https://laravel.com/docs/5.8/eloquent-relationships#eager-loading

Answer 2

Model Student(table name)
//relation beetween student and classroom
public function StudentClassroom(){
return $this->belongsToMany('App\Classroom','inscribed_student','student_id','classroom_id')->withTimestamps();
}
//relation beetween Student and InscribedStudent
public function enrolled(){
return $this->hasMany('App\InscribedStudent','student_id','id');
}
Model Classroom (table name)
//relation beetween classroom and student
public function classroomstudents(){
return $this->belongsToMany('App\Student','inscribed_student','classroom_id','student_id')->withTimestamps();
}
//relation beetween classroom and SelectionProcess
public function selectionclass(){
return $this->hasMany('App\SelectionProcess','classroom_id','id');
}
Model SelectionProcess(table name)
//relation beetween SelectionProcess and InscribedStudent
public function SelectionProcesInscribedStudent(){
return $this->belongsToMany('App\InscribedStudent','student_selection_process ','inscribed_student_id','selection_process_id')->withTimestamps();
}
Model InscribedStudent(table name)
//relation beetween InscribedStudent and SelectionProcess
public function InscribedStudentSelectionProces(){
return $this->belongsToMany('App\SelectionProcess','student_selection_process ','selection_process_id','inscribed_student_id')->withTimestamps();
}
//relation beetween InscribedStudent and Student
public function student()
{
return $this->belongsTo('App\Student','student_id','id');
}
//relation beetween InscribedStudent and classroom
public function classroom()
{
return $this->belongsTo('App\classroom','classroom_id','id');
}
Model StudentSelectionProcess(table name)
//relation beetween StudentSelectionProcess and InscribedStudent
public function inscribed_student()
{
return $this->belongsTo('App\InscribedStudent','inscribed_student_id','id');
}
//relation beetween StudentSelectionProcess and SelectionProcess
public function selection_process()
{
return $this->belongsTo('App\SelectionProcess','selection_process_id','id');
}
Now do in your controller
Student::with(['StudentClassroom','enrolled.InscribedStudentSelectionProces']);

Answer 3

Take a look on this : https://laravel.com/docs/5.8/eloquent-relationships
It's how I would do this. Rename the relationship to the one you will create in your model.
$student = Student::with(['manyToMany_classrooms_students.hasMany_selectionProcess' => function($query1) use($id) {
$query1->where('enabled', 1);
$query1->with(['hasMany_studentSelectionProcess' => function($query2) use($id) {
$query2->where('student_id', $id);
}])
}])->find($id);
I would also change your table for this
+--------------------+
| InscribedStudent |
+--------------------+
| //id | << Remove id -> you don't need this for that situation
| student_id |
| classroom_id |
+--------------------+
+-------------------------+
| StudentSelectionProcess |
+-------------------------+
| id |
| student_id | << Refer directly to your student -> InscribedStudent is
| selection_process_id | not a model, it's a pivot table
| status |
+-------------------------+
Using this, with correct relationship, you can find a user with StudentSelectionProcess. Join the SelectionProcess then the classroom.
Student -> hasMany -> StudentSelectionProcess -> belongsTo -> SelectionProcess -> belongsTo -> Classroom
Taking time to create relationships correctly will make your life easier.