Update an entry when another entry links to it

[ARCHES-Academy]

Consider this scenario:

An entry (A) blueprint contains an Entry link field, and a user uses this field to link an entry (A) to another entry (B).

Is there an option to automatically update the linked entry (B) with a reference to the entry (A) being linked from?

[edalzell]

You could write a listener for EntrySaved and handle it in there?

[ARCHES-Academy]

Is the entry given when that event fires an instance of Statamic\Facades\Entry?

public function handle(EntrySaved $event)
{
    $event->entry;
}

Meaning, do I have access to all of the methods of that Facade, like $event->entry->id(),
or $event->entry->value('content')?

[duncanmcclean]

Is the entry given when that event fires an instance of Statamic\Facades\Entry?

public function handle(EntrySaved $event)

{

    $event->entry;

}

Meaning, do I have access to all of the methods of that Facade, like $event->entry->id(),

or $event->entry->value('content')?

Yes, you'll have access to all the same methods.

[ARCHES-Academy]

Awesome, thanks for the guidance. For those that may be trying the same thing, here's the function that I wrote that is working for me.

public function handle(EntrySaved $event)
    {
        $entry = $event->entry;
        if ($entry->value('assignments') !== null) {
            $assignments = $entry->value('assignments');
            if (is_array($assignments)) {
                foreach ($assignments as $assignment) {
                    $a = Entry::find($assignment);
                    if ($a !== null) {
                        $a->set('lesson_plan', $entry->id());
                        $a->saveQuietly();
                    }
                }
            } else {
                $a = Entry::find($assignments);
                if ($a !== null) {
                    $a->set('lesson_plan', $entry->id());
                    $a->saveQuietly();
                }
            }
        }
    }

[edalzell]

FYI, your code can be tided up:

if (! $assignments = $entry->value('assignments')) {
    return;
}

foreach (Arr:wrap($assignments) as $assignment) {
    if ($a = Entry::find($assignment)) {
        $a->set('lesson_plan', $entry->id())->saveQuietly();
	}
}

[ARCHES-Academy]

Nice, thanks for that. I'm still a bit of a beginner when it comes to PHP.