CourseWork/app/Models/Lesson.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 Lesson extends Model
{
    use HasFactory;

    protected $fillable = [
        'name',
        'type',
        'lesson_date',
        'grade_id',
        'teacher_id',
        'subject_id',
    ];

    public function scores(): HasMany
    {
        return $this->hasMany(Score::class);
    }

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

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

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