[9.x] Add ability to discard Eloquent Model changes

[crynobone]

Project::updating(function (Project $model) {
    /*
     * The project update should be a change request
     */
    $changeRequest = new ProjectChangeRequest([
        'original' => array_intersect_key($model->getRawOriginal(), $model->getDirty()),
        'changes' => $model->getDirty(),
    ]);

    $changeRequest->source_model()->associate($model);
    $changeRequest->save();

    // Now we can simply ignore all attribute changes and only save `status="change_request"`
    $model->discardChanges();

    $model->status = 'change_request';
});

Signed-off-by: Mior Muhammad Zaki crynobone@gmail.com

[bernardwiesner]

Seems almost same as this PR: #37756

[bert-w]

Maybe add an $options parameter to add except/only functionality? Somewhat similar to:

framework/src/Illuminate/Routing/ResourceRegistrar.php

Lines 159 to 172 in 3d068ab

	protected function getResourceMethods($defaults, $options)
	{
	$methods = $defaults;
	if (isset($options['only'])) {
	$methods = array_intersect($methods, (array) $options['only']);
	}
	if (isset($options['except'])) {
	$methods = array_diff($methods, (array) $options['except']);
	}
	return $methods;
	}

[amitmerchant1990]

Hi!

Just curious about how is it different from refreshing models.

[rodrigopedra]

@amitmerchant1990

refresh() reloads the model data from the database. You do a database call, and can get attributes that might have changed from another requests in the meanwhile.

discardChanges() will, eh, discard any unsaved changes, and return the model to its original state, without performing a database call.