How do you check if the current user is the same as a foreign key in a model

Question

I have a model called Tribe which contains a foreign key (user) called chieftain. I made a method in the model which checks if the current user is the same as the foreign key. But when I try to use the method in my html code it doesn't work, no errors show up it just doesn't show a link its supposed to even though the foreign key is set to the user I've logged in. 

Here's the code

tribe.html

<div class="row">
    <div class="col-md-10">
            {% if tribe.is_chieftan %}
                <p><a href="{% url 'app:update-tribe' %}">Update tribe</a></p>
            {%endif%}
    </div>
</div>

model.py

class Tribe(TimeStamped):
    name = models.CharField(max_length=200,unique=True)
    chieftain = models.ForeignKey(settings.AUTH_USER_MODEL,on_delete=models.CASCADE)
    tribe_members = models.ManyToManyField(Member)

    def __str__(self):
        return self.name[:80]

    def is_chieftain(self,request):
        if (self.chieftain == request.user):
            return True
        else:
            return False