Get ROLE of a user not logged in TWIG Symfony2

Question

I would like to know how can i know if a user is granted when it's not the current user in twig.

I use this code for the current user:

{% if is_granted('ROLE_USER') %}
    <a href="...">Delete</a>
{% endif %}

But i would like to be able to do the same thing with ohter users that are not logged in at the moment. Thank you.

Edit: In fact i think there isn't a direct way with twig to test role of a user that is not authenticated. So i did it directly in the twig template, test if a user is admin or not, then set var. (in my question i was searching how to do in a list of users.)

{% set from_user_is_admin = false %}
{% for role in from_user.getRoles() %} 
    {% if role == 'ROLE_ADMIN' %}{% set from_user_admin = true %}{% endif %}
    {% if role == 'ROLE_SUPER_ADMIN' %}{% set from_user_admin = true %}{% endif %}
{% endfor %}
{% if from_user_admin == false %}THIS USER IS NOT ADMIN{% endif %}

Answer 1

I think it would be much easier if you implemented an isGranted function in the User entity:

Class User implements UserInterface {
    ...
    public function isGranted($role)
    {
        return in_array($role, $this->getRoles());
    }
}

You can now easily check for granted roles in every layer of your application. In PHP:

$user->isGranted("USER_ADMIN")

Or in Twig:

user.granted("USER_ADMIN")

If you need to check a role for the current user, you can do this in Twig:

app.user.granted("USER_ADMIN")

Note: the variable "app" is globally defined.

Note 2: this code may throw an exception if you use it outside the secured area of your app, since app.user would be NULL.

Answer 2

You can use similar statement to the above with "not" :

{% if not is_granted('ROLE_USER') %}
    <a href="...">Delete</a>
{% endif %}

or use else statement:

{% if is_granted('ROLE_USER') %}
    <a href="...">Delete</a>
{% else %}
    {# something else for guest user, not logged in #}
{% endif %}