如何在Laravel中为数据透视表编写关系？

Question

Here is my table structure:

// tickets
+----+------------+----------------------+--------+---------+-------------------+
| id |  subject   |        content       | closed | user_id | unique_product_id |
+----+------------+----------------------+--------+---------+-------------------+
| 1  | subject1   | question1            | 0      | 123     | 2                 |
+----+------------+----------------------+--------+---------+-------------------+

// unique_product
+----+---------------+------------+
| id | serial_number | product_id |
+----+---------------+------------+
| 1  | 2342rd34fc    | 3          |
| 2  | fg34gt4r5t    | 1          |
| 3  | 34ffvv4et6    | 3          |
+----+---------------+------------+

// products
+----+--------------+
| id |     name     | 
+----+--------------+
| 1  | Router-rb51  |
| 2  | Switch-sfx2  |
| 3  | Router-rb300 |
+----+--------------+

Now I have a collection of tickets like this:

$tickets = tickets::where(user_id, "$user_id")->get();
foreach( $tickets as $ticket ){
    $ticket->{I need to get the name of product here}
}

I can write a relation in the tickets model like this:

public function unique_product()
{
    return $this->hasOne(unique_product::class, 'id', 'unique_product_id');
}

And I need one more relation to the products table for getting the name of product (ie Switch-sfx2 ). How should I write that relation?

Answer 1

$tickets = tickets::where(user_id, "$user_id")->with('unique_product.product')->get();

You can take advantage eager loading using with() .

but for using with('unique_product.product') You have to define the relation ships between unique_products and products.

In your UniqueProduct model create a new relationship

public function product()
{
    return $this->BelongsTo(Product::class, 'id', 'product_id');
}

After that you can access the column of a name like

foreach( $tickets as $ticket ){
    $ticket->unique_product->product->name
}