How to chain 3 laravel nested models - php

Question

I am trying to chain 3 models together parent->child->child of child. So I can access it in an eloquent statement.
Parent Model:
class CertificationType extends Model
{
use SoftDeletes;
public $timestamps = true;
protected $table = 'certification_type';
protected $dates = ['deleted_at'];
protected $fillable = array('certification_type_name', 'fa_code', 'icon_image');
protected $hidden = ['created_at', 'updated_at',];
public function certification_type()
{
return $this->hasMany('App\Certification');
}
}
Child Model
class Certification extends Model
{
protected $table = 'certification';
public $timestamps = true;
use SoftDeletes;
protected $dates = ['deleted_at'];
/**
* The attributes that are mass assignable.
*
* #var array
*/
protected $fillable = array('certification_type_id', 'certification_name', 'certication_date', 'certification_license_number', 'certification_course_length', 'certification_course_description', 'certification_course_topics_list_id');
/**
* The attributes that should be hidden for arrays.
*
* #var array
*/
protected $hidden = [
'created_at', 'updated_at',
];
public function certification_type()
{
return $this->belongsTo('App\CertificationType',
'certification_type_id');
}
public function certification_course_topics_list()
{
return $this->hasMany('App\CertificationCourseTopicsList');
}
}
Child of Child Model
<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\SoftDeletes;
class CertificationCourseTopicsList extends Model
{
protected $table = 'certification_topics_list';
public $timestamps = true;
use SoftDeletes;
protected $dates = ['deleted_at'];
/**
* The attributes that are mass assignable.
*
* #var array
*/
protected $fillable = array('certification_id', 'certification_topic_description');
/**
* The attributes that should be hidden for arrays.
*
* #var array
*/
protected $hidden = [
'created_at', 'updated_at',
];
public function certification_course_topics_list()
{
return $this->belongsToMany('App\Certification', 'certification_id');
}
}
The eloquent statement I am using is:
$CertificationTypes = App\CertificationType::orderBy('id',"asc")->with('certification_type')->get()->groupBy('id');
What I have accomplished is CertificationType has a child of Certifications attached in the query. What I need is the 2nd child to be in the query as well:
CertificationType::orderBy('id',"asc")->with('certification_type')->get()->groupBy('id')->with('certification')->get()->groupBy('id');
I also tried:
CertificationType::orderBy('id',"asc")->with('certification_type, certifications')->get()->groupBy('id');
That did not work: Call to undefined relationship [certification_type, certifications] on model [App\CertificationType].
Also tried:
CertificationType::orderBy('id',"asc")->with('certification_type', 'certifications')->get()->groupBy('id');
That did not work: Call to undefined relationship [certifications] on model [App\CertificationType].
Any help would be appreciated!

Answer 1

You need more order in code. I would make three models with proper relations as : belongsTo and hasMany. Then in each view you can use data from model with function of relation.
Example of proper model with relation:
namespace App;
use Illuminate\Database\Eloquent\Model;
class Post extends Model
{
/**
* Get the comments for the blog post.
*/
public function comments()
{
return $this->hasMany('App\Comment');
}
}
Read more here, that will save your time: https://laravel.com/docs/5.5/eloquent-relationships#one-to-many