how to split long symfony form in multiple pages?

Question

I want to create a form for an entity which has a many attributes. To ensure the ease of data entry, I want to split that form in multiple pages (for example 2 or 3 pages).

Answer 1

You don't have to split your entity, but your form : create 3 forms, each containing the property needed from the ad entity.

You'll need to :

• persist (and not flush) the $ad object at every step inside your controller
• pass the $ad object as an argument when forwarding inside your controller
• flush the $ad object in the last step

In pseudo-code, your controller would look like this :

public function newAdStep1() {
    new Ad() // New instance of $ad
    new formStep1($ad) // The first form containing only the ad text field

    // The form was filled, manage it...
    form->isValid()? {
        persist($ad); // Persist the first part of your ad object
        forward(newAdStep2, $ad) // Go on to step 2, your $ad object as an argument
    }

    // ... or display step1 to user
    createView createAdStep1.html.twig('form' => $form);
}

public function newAdStep2($ad) {
    new formStep2($ad); // Now the second form, containing the "contact" fields
    isValid ? {
        persist($ad)
        forward(newAdStep3, $ad)
    }
    createView createAdStep2($form, $ad); // Your $ad object needs to be sent to the view
}

public function newAdStep3($ad) {
    new formStep3($ad); // Third and last form, containing the (X,Y) fields
    isValid ? {
        $em->persist($ad);
        $em->flush(); // Your instance of $ad can be stored in database now
        return('success !');
    }
    return view createAdStep3($form, $ad);
}