decorators.py

from functools import wraps
from src.models import Adminstrator
from graphql.execution.base import ResolveInfo
from graphql_jwt.exceptions import PermissionDenied


def context(f):
    def decorator(func):
        def wrapper(*args, **kwargs):
            info = next(arg for arg in args if isinstance(arg, ResolveInfo))
            return func(info.context, *args, **kwargs)

        return wrapper

    return decorator


def validate_user_admin(test_func, exc=PermissionDenied()):
    def decorator(f):
        @wraps(f)
        @context(f)
        def wrapper(context, *args, **kwargs):
            if test_func(context.user):
                admin = Administrator.objects.filter(
                    user_ptr_id=context.user.id
                ).first()
                context.admin = admin
                if not admin:
                    raise PermissionDenied(message="User is not administrator.")
                elif not admin.active_admin:
                    raise PermissionDenied(message="Administrator is disabled.")
                return f(*args, **kwargs)
            raise exc

        return wrapper

    return decorator


# create decorators
admin_required = validate_user_admin(lambda u: u)

querys.py

import graphene
from graphene_django import DjangoObjectType
from src.models import Language
from src.decorator import admin_required 

class LanguageType(DjangoObjectType):
    class Meta:
        model = Language


class Query:

    list_languages = graphene.List(LanguageType)
    
    @admin_required
    def resolve_list_languages(root, info, **kwargs):
        return Language.objects.all()