applicant-site/app/Models/Direction.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\HasMany;

class Direction extends Model
{
    use HasFactory;

    protected $fillable = [
        'id',
        'name',
        'description',
        'position',
        'slug',
        'code',
    ];

    public function department(): BelongsTo
    {
        return $this->belongsTo(Department::class);
    }

    public function educationLevel(): BelongsTo
    {
        return $this->belongsTo(EducationLevel::class);
    }

    public function educationForm(): BelongsTo
    {
        return $this->belongsTo(EducationForm::class);
    }

    public function entranceExaminations(): HasMany
    {
        return $this->hasMany('App\Models\EntranceExamination', 'direction_id');
    }

    public function places(): HasMany
    {
        return $this->hasMany('App\Models\Place', 'direction_id');
    }

    public function costs(): HasMany
    {
        return $this->hasMany('App\Models\Cost', 'direction_id');
    }
}