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class Student extends Model 
{
    public function school()
    {
        return $this->belongsTo(School::class);
    }
}

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class School extends Model 
{
    public function student()
    {
        return $this->hasOne(Student::class);
    }
}

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

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class Department extends Model 
{
    public function employees()
    {
        return $this->hasMany(Employee::class);
    }
}

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class Student extends Model 
{
    public function courses()
    {
        return $this->belongsToMany(Course::class);
    }
}

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class Course extends Model
{
    public function students()
    {
        return $this->belongsToMany(Student::class);
    }
}

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