Get ROLE of a user not logged in TWIG Symfony2 - symfony

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') %}
Delete
{% 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') %}
Delete
{% endif %}
or use else statement:
{% if is_granted('ROLE_USER') %}
Delete
{% else %}
{# something else for guest user, not logged in #}
{% endif %}

Answer 3

You should create either a twig macro, or a twig function.
Creating a macro is very simple, using your code:
{% macro admin_status(from_user) %}
{% 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 %}
{% endmacro %}
You can then use it in the same file as {% _self.admin_status(user) %}. You may also move it to a separate file, and use twig's import tag to gain access to it.
Creating a twig function is a better option, for details see extending twig. It boils down to creating a regular function, that may be called from twig, so code like this becomes possible:
{% if user_is_admin(user) %}
You'll also need to read enabling custom twig extensions.

Answer 4

i did it this way, have this snippet in the global twig file, in my case layout.html.twig
{% set is_admin = false %}
{% if app.security.token.user.roles is iterable %}
{% for role in app.security.token.user.roles %}
{% if role == 'ROLE_ADMIN' or role == 'ROLE_SUPER_ADMIN' %}
{% set is_admin = true %}
{% endif %}
{% endfor %}
{% endif %}
then i can use anywhere
{% if is_admin %}....{% endif %}