No data was collected in my relation array in Laravel Eloquent method - php

Question

I used eloquent method in my controller to collect data from my database, but something weird happened. If i use this code below,
$female_old_visitors = Treatment::with('diseases', 'patient', 'insurance', 'referer')
->leftJoin('patients', 'treatments.patient_id', 'patients.id')
->where('treatments.visit_status', 'old')
->where('patients.gender', 'female')
->whereBetween('treatments.date', $date_range)
->get();
i can get all the data that i want include diseases and referer
Collection {#3053 ▼
#items: array:25 [▼
0 => Treatment {#2799 ▼
...
#relations: array:4 [▼
"diseases" => Collection {#3346 ▼
#dates: array:1 [▶]
#cascadeDeletes: array:1 [▶]
#guarded: []
#connection: "mysql"
#table: "diseases"
#primaryKey: "id"
#keyType: "int"
+incrementing: true
#with: []
#withCount: []
#perPage: 15
+exists: true
+wasRecentlyCreated: false
#attributes: array:32 [▶]
#original: array:32 [▶]
#changes: []
#casts: []
#dateFormat: null
#appends: []
#dispatchesEvents: []
#observables: []
#relations: []
#touches: []
+timestamps: true
#hidden: []
#visible: []
#fillable: []
#forceDeleting: false
}
"patient" => Patient {#3328 ▶}
"insurance" => Insurance {#3346 ▶}
"referer" => TreatmentReferer {#3138 ▶}
]
#touches: []
+timestamps: true
#hidden: []
#visible: []
#fillable: []
#forceDeleting: false
}
but when i use other code like this
$common_insurance_old_visitors = Treatment::with('diseases', 'patient', 'insurance', 'referer')
->leftJoin('insurances', 'treatments.insurance_id', 'insurances.id')
->where('treatments.visit_status', 'old')
->where('insurances.id', 1)
->whereBetween('treatments.date', $date_range)
->get();
all the data has been selected or collected except disease and referer
Collection {#3053 ▼
#items: array:25 [▼
0 => Treatment {#2799 ▼
...
#relations: array:4 [▼
"diseases" => Collection {#3246 ▼
#items: []
}
"patient" => Patient {#3328 ▶}
"insurance" => Insurance {#3346 ▶}
"referer" => null
]
#touches: []
+timestamps: true
#hidden: []
#visible: []
#fillable: []
#forceDeleting: false
}
i have been checking in my database, that the data is still there and the column is not empty, it should be collected just like the code i use first. Is it because i use left join uncorrectly? i am still new for laravel, thanks for anyone who giving me a solution for this problem
this is my model for Treatment
<?php
namespace App;
use Carbon\Carbon;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\SoftDeletes;
use Iatstuti\Database\Support\CascadeSoftDeletes;
class Treatment extends Model
{
use SoftDeletes, CascadeSoftDeletes;
protected $dates = ['deleted_at'];
protected $cascadeDeletes = ['medicines', 'actions', 'referer', 'diseases', 'queues'];
protected $guarded = [];
public function queues(){
return $this->hasMany(TreatmentQueue::class);
}
public function treatmentType(){
return $this->belongsTo(TreatmentType::class);
}
public function medicines(){
return $this->hasMany(TreatmentMedicine::class)->with('medicine', 'recu');
}
public function actions(){
return $this->hasMany(TreatmentAction::class)->with('action', 'doctor', 'nurse', 'recu', 'teeth', 'therapy', 'treatmentDisease');
}
public function insurance(){
return $this->belongsTo(Insurance::class);
}
public function referer(){
return $this->hasOne(TreatmentReferer::class)->with('puskesmas', 'disease');
}
public function diseases(){
return $this->hasMany(TreatmentDisease::class)->with('disease', 'doctor', 'teeth');
}
public function patient(){
return $this->belongsTo(Patient::class);
}
}

Answer 1

with() is for eager loading. That basically means, along the main model, Laravel will preload the relationship(s) you specify. This is especially helpful if you have a collection of models and you want to load a relation for all of them. Because with eager loading you run only one additional DB query instead of one for every model in the collection.
In your example.
you're using left join why? it already contain in with() you use with('patient') it means you join treatments to left join with patient
$female_old_visitors = Treatment::with('diseases', 'insurance', 'referer')
->with(['patient' => function ($q) {
$q->where('gender', 'female');
}])
->where('visit_status', 'old')
->whereBetween('treatments.date', $date_range)
->get();
eager-loads