如何从数据透视表中获取额外的字段-Laravel

Question

I have create a Pivot model and table for laravel and added extra field to the pivot model. But the extra field is not displaying when calling pivot data.

I have a Customer model and Tag model. And a pivot called CustomerTag Created a User with tags and added extra fiend to pivot table using

$user = User::create([
     'name' => 'User 1'
]);
$tag = 1;

$user->tags()->attach($tag, ['priority' => 1]);

But when I calling result

$use = User::find($id);
dd($user->tags->pivot);

The result doesn't have priority field.

Answer 1

You have to call withPivot function when establishing the association on User model:

public function tags()
{
    return $this->belongsToMany(Tag::class, 'customer_tag', 'user_id', 'tag_id')
                ->withPivot('priority');
}

and then call it when getting the result:

$tags = $user->tags;
foreach ($tags as $tag) {
    $priority = $tag->pivot->priority;
}

Answer 2

In many to many relationship tags have multiple results

try

dd($user->tags[0]->pivot);

or use loop

 foreach ($user->tags as $tag){
    dd($tag->pivot);
 }