def add_keys(apps, schema_editor):
    """
    We can't import the Post model directly as it may be a newer
    version than this migration expects. We use the historical version.
    """
    Setting = apps.get_model('settings', 'Setting')
    key = ''
    try:
        key = 'MANAGER_PRODUCT_ID'
        Setting.objects.get(key=key)
    except Exception:
        Product = apps.get_model('products', 'Product')
        ContentType = apps.get_model('contenttypes', 'ContentType')
        product = Product.objects.create(price_fabric=1, title=
            'محصول مدیریتی', is_show_only_for_super_user=True,
            aparnik_bon_return_value=1, maximum_use_aparnik_bon_value=1,
            aparnik_bon_return_expire_value=0)
        new_ct = ContentType.objects.get_for_model(Product)
        Product.objects.filter(polymorphic_ctype__isnull=True).update(
            polymorphic_ctype=new_ct)
        Setting.objects.create(title='آی دی محصول مدیریتی', key=key, value=
            str(product.id), value_type='i', is_show=False,
            is_variable_in_home=False)
