完整性约束 violation/foreign 键约束失败

Question

我有以下完整性约束违规，其中外键约束失败。任何想法表示赞赏。

SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails (go-motoring.promotion_products, CONSTRAINT promotion_products_product_id_foreign FOREIGN KEY (product_id) REFERENCES products (id) ON DELETE CASCADE) (SQL: insert into promotion_products (product_id, promotion_id) values (0, 3))

产品型号

public function categories()
{
    return $this->belongsToMany(EcommerceCategory::class, 'product_categories', 
        'product_id', 'ecommerce_category_id');
}

推广模式

public function products()
{
    return $this->belongsToMany(Product::class, 'promotion_products', 
        'promotion_id', 'product_id');
}

促销控制器

$params = $request->except(['_token', 'select_product']);
$promotion = new Promotion($params);
$promotion->save();
//category sync
$data['product_ids'] = $request->select_product; //convert product ids in array
$promotion->products()->sync($data['product_ids']); //sync (insert & update)

Answer 1

solution. because 0 value exist in incoming data. 0 not save as a foreign key

完整性约束 violation/foreign 键约束失败

Integrity constraint violation/foreign key constraint fails

laravel

eloquent

relational-database

relationship