Laravel Pivot Events

This package introduces new eloquent events for sync(), attach(), detach(), or updateExistingPivot() methods on BelongsToMany and MorphToMany relationships.

This package is a fork of fico7489/laravel-pivot created mainly to address compatibility issues with Laravel Telescope and Model Caching for Laravel.

Requirements

• Laravel 5.5+
• PHP 7.1.3+

Installation

1.Install package with composer: composer require "genealabs/laravel-pivot-events:*"

2. Use GeneaLabs\LaravelPivotEvents\Traits\PivotEventTrait trait in your base model or only in particular models.

   // ...
   use Fico7489\Laravel\Pivot\Traits\PivotEventTrait;
   use Illuminate\Database\Eloquent\Model;
   
   abstract class BaseModel extends Model
   {
       use PivotEventTrait;
       // ...
   }
   

New Eloquent Events

You can check all eloquent events here: https://laravel.com/docs/5.8/eloquent#events)

New events are :

• pivotAttaching, pivotAttached
• pivotDetaching, pivotDetached
• pivotUpdating, pivotUpdated

The easiest way to catch events is using methods in your model's boot() method:

public static function boot()
{
    parent::boot();

    static::pivotAttaching(function ($model, $relationName, $pivotIds, $pivotIdsAttributes) {
        //
    });
    
    static::pivotAttached(function ($model, $relationName, $pivotIds, $pivotIdsAttributes) {
        //
    });
    
    static::pivotDetaching(function ($model, $relationName, $pivotIds) {
        //
    });

    static::pivotDetached(function ($model, $relationName, $pivotIds) {
        //
    });
    
    static::pivotUpdating(function ($model, $relationName, $pivotIds, $pivotIdsAttributes) {
        //
    });
    
    static::pivotUpdated(function ($model, $relationName, $pivotIds, $pivotIdsAttributes) {
        //
    });
    
    static::updating(function ($model) {
        //this is how we catch standard eloquent events
    });
}

You can also catch them using dedicated Event Listeners:

\Event::listen('eloquent.*', function ($eventName, array $data) {
    echo $eventName;  //e.g. 'eloquent.pivotAttached'
});

Supported Relationships

BelongsToMany and MorphToMany

Which events are dispatched and when they are dispatched

Four BelongsToMany methods dispatches events from this package :

attach()
Dispatches one pivotAttaching and one pivotAttached event.
Even when more rows are added only one event is dispatched for all rows but in that case, you can see all changed row ids in the $pivotIds variable, and the changed row ids with attributes in the $pivotIdsAttributes variable.

detach()
Dispatches one pivotDetaching and one pivotDetached event.
Even when more rows are deleted only one event is dispatched for all rows but in that case, you can see all changed row ids in the $pivotIds variable.

updateExistingPivot()
Dispatches one pivotUpdating and one pivotUpdated event.
You can change only one row in the pivot table with updateExistingPivot.

sync()
Dispatches more pivotAttaching and more pivotAttached events, depending on how many rows are added in the pivot table. These events are not dispatched if nothing is attached.
Dispatches one pivotDetaching and one pivotDetached event, but you can see all deleted ids in the $pivotIds variable. This event is not dispatched if nothing is detached.
E.g. when you call sync() if two rows are added and two are deleted two pivotAttaching and two pivotAttached events and one pivotDetaching and one pivotDetached event will be dispatched.
If sync() is called but rows are not added or deleted events are not dispatched.

Usage

We have three tables in database users(id, name), roles(id, name), role_user(user_id, role_id). We have two models :

...
class User extends Model
{
    use PivotEventTrait;
    ....
    
    public function roles()
    {
        return $this->belongsToMany(Role::class);
    }
    
    static::pivotAttached(function ($model, $relationName, $pivotIds, $pivotIdsAttributes) {
        echo 'pivotAttached';
        echo get_class($model);
        echo $relationName;
        print_r($pivotIds);
        print_r($pivotIdsAttributes);
    });
    
    static::pivotUpdated(function ($model, $relationName, $pivotIds, $pivotIdsAttributes) {
        echo 'pivotUpdated';
        echo get_class($model);
        echo $relationName;
        print_r($pivotIds);
        print_r($pivotIdsAttributes);
    });
    
    static::pivotDetached(function ($model, $relationName, $pivotIds) {
        echo 'pivotDetached';
        echo get_class($model);
        echo $relationName;
        print_r($pivotIds);
    });

...
class Role extends Model
{
    ....

Attaching

For attach() or detach() one event is dispatched for both pivot ids.

Attaching with int

Running this code

$user = User::first();
$user->roles()->attach(1);

You will see this output

pivotAttached
App\Models\User
roles
[1]
[1 => []]

Attaching with array

Running this code

$user = User::first();
$user->roles()->attach([1]);

You will see this output

pivotAttached
App\Models\User
roles
[1]
[1 => []]

Attaching with model

Running this code

$user = User::first();
$user->roles()->attach(Role::first());

You will see this output

pivotAttached
App\Models\User
roles
[1]
[1 => []]

Attaching with collection

Running this code

$user = User::first();
$user->roles()->attach(Role::get());

You will see this output

pivotAttached
App\Models\User
roles
[1, 2]
[1 => [], 2 => []]

Attaching with array (id => attributes)

Running this code

$user = User::first();
$user->roles()->attach([1, 2 => ['attribute' => 'test']], ['attribute2' => 'test2']);

You will see this output

pivotAttached
App\Models\User
roles
[1, 2]
[1 => [], 2 => ['attribute' => 'test', 'attribute2' => 'test2']]

Syncing

For sync() method event is dispatched for each pivot row.

Running this code

$user = User::first();
$user->roles()->sync([1, 2]);

You will see this output

pivotAttached
App\Models\User
roles
[1]
[1 => []]

pivotAttached
App\Models\User
roles
[2]
[2 => []]

Detaching

Running this code

$user = User::first();
$user->roles()->detach([1, 2]);

You will see this output

pivotAttached
App\Models\User
roles
[1, 2]

Updating

Running this code

$user = User::first();
$user->roles()->updateExistingPivot(1, ['attribute' => 'test']);

You will see this output

pivotUpdated
App\Models\User
roles
[1]
[1 => ['attribute' => 'test']]