Laravel 5.7雄辩地更新/删除多个记录

Question

My table structure is like this:

invoices: 

        id, title, desciption, total_amount, --

products: 

        id, name, price, --

invoice_products

        id, invoice_id, product_id, --

• One invoice can have multiple products, so,

• I created an invoice with products, then data fills according to above DB structure.

• When i update invoice (let say invoice_id = 2 ), then, i am confused what is the best way to update "invoice_products" table.

• My approach is ( for "invoice_products" table):

  • delete * from invoice_products where invoice_id=2;
  • then insert modified products again.

• I think this is not good approach, as i am force deleting the rows in "invoice_products" and again inserting new updated products.

• is there any way to do via eloquent ?

Answer 1

I think invoice_products is pivot table. You should use sync method.

$productIds = [1,2,3];
$Invoice->products()->sync($productIds);

Also in your invoice Model the relationship should be like this

public function products()
{
    return $this->belongsToMany(Invoice::class, 'invoice_products', 'invoice_id', 'product_id');
}

More Details

Answer 2

You can use Laravel many to many relation to achieve this functionality:

Invoice Model

public function products()
{
    return $this->belongsToMany('App\Product', 'invoice_products');
}

Product Model

Though it is not required here but you can use this to get invoice for related products.

public function invoices()
{
    return $this->belongsToMany('App\Product', 'invoice_products');
}

To update the existing data you can use sync method:

$products = [1, 2, 3, 4];
$invoice->products()->sync($products);

You can read more about relationship over https://laravel.com/docs/5.7/eloquent-relationships