For rendering form errors in a twig template, you just have to use the form_errors twig macro without difference if it is a global form error or a field error.
But in my case, a global error is not rendered like a field error, so I can’t use the form_errors twig macro for the two cases. I decide to use the macro for the field error & I would like to get the global form errors from the Symfony\Component\Form\FormView object. The goal is to iterate the global errors in the twig template & render them like I want.
Actually, I don’t find any ressources on the symfony2 documentation which can help me.
Finally, I found the solution by myself. For the people who want to do the same thing, the solution is to call
$formView->get("errors")which gives you an array ofFormError