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Eloquent / Laravel: is there a reference to an object-> load ('relation') eg. object-> defuse ('relation')?

When I update a relation eg. update parent_id to Child (Child belongs to parent, parent) and respond with a Child-> Parent object since the returned parent is still old. I think this is because the parent is already loaded at this time.

Now I want to unbind the relationship so that the new parent is fetched from the db again.

Is there a way to unload the loaded relationships? How can you lazy-load using model-> load ('relation'), can you unload it again?

Thank you so much!

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4 answers


You can unload relationships by disabling the magic property (at least in Laravel 5.3 and up).

Using:

unset($model->relation);


What does this work (from the Model class):

public function __unset($key)
{
    unset($this->attributes[$key], $this->relations[$key]);
}

It does the same as $model->setRelations([])

but for a specific relationship (instead of unloading all relationships).

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Unloading relations can be done by passing an empty array to the model

$child->setRelations([]);


when you call the model afterwards, it will be reloaded at that point.

.. in the current version (5.x), at least maybe not at the time of your question :)

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There is no analog load

that allows you to unload the connection.

However, to reload the relationship from the database, you can simply call load

again

$parent = $child->load('relation');
// change parent_id
$parent = $child->load('relation');

I took a quick look at the laravel source and didn't find any hint of some kind of caching. So it just makes a new request, getting the connection again.

Thanks to @Jarek Tkaczyk for confirming my assumption

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Since Laravel 5.6, there is unsetRelation(string)

.

$parent->load('child');

$parent->unsetRelation('child');

I think this provides a little more readability if you're just trying to dump one link rather than deleting everything with $parent->setRelationships([])

.

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