Filter queryset based on another model's foreign key in a class based view.

Hi there,
I'm having trouble in filtering objects of a model based on another model's foreign key. The scenario is, I've got a forum homepage and when a topic is clicked, it opens its DetailView. Now if I try to get all answers in the database there's no issue, but I want to get only the answers which are there only for that particular topic.

here are my project files

views.py

from django.views import generic
from django.views.generic.edit import CreateView
from .models import Topic, Answer
from .forms import TopicForm
from django.contrib.auth.decorators import login_required

class IndexView(generic.ListView):
    template_name = 'index.html'
    context_object_name = 'topic_list'
    def get_queryset(self):
        return Topic.objects.all()

 

class TopicDetailView(generic.DetailView):
    model = Topic
    context_object_name = 'topic'
    template_name = 'topicdetail.html'

 

    def get_context_data(self, **kwargs):
        context = super(TopicDetailView, self).get_context_data(**kwargs)
        context["answer"] = Answer.objects.filter(<can't figure out this>)
        return context 

 

 

class TopicCreateView(CreateView):
    model = Topic
    form_class = TopicForm
    template_name = 'topic_form.html'

models.py

from django.db import models
from oauth.models import UserProfile
from ckeditor_uploader.fields import RichTextUploadingField
from django.core.urlresolvers import reverse

 

class Topic(models.Model):
    # Choices
    CAT_CHOICES = (
        ('Q', 'Question'),
        ('F', 'Feedback'),
    )
    # Topic Database Model
    owner = models.ForeignKey(UserProfile, on_delete=models.CASCADE)
    category = models.CharField(max_length=3, choices=CAT_CHOICES, default='Q')
    title = models.CharField(max_length=256)
    content = RichTextUploadingField(blank=True)
    slug = models.SlugField(unique=True)
    views = models.PositiveIntegerField(default=0)
    answers = models.PositiveIntegerField(default=0)
    tags = models.CharField(max_length=50)
    created_at = models.DateTimeField(auto_now_add=True)

 

    def get_absolute_url(self):
        return reverse('forum:detail', kwargs={'pk': self.pk})

 

    def __str__(self):
        return self.title

class Answer(models.Model):
    topic = models.ForeignKey(Topic, on_delete=models.CASCADE)
    owner = models.ForeignKey(UserProfile, on_delete=models.CASCADE)
    content = RichTextUploadingField(blank=True)
    created_at = models.DateTimeField(auto_now_add=True)
    total_votes = models.SmallIntegerField(default=0)

urls.py

from django.conf.urls import url
from forum import views
from django.contrib.auth.decorators import login_required

 

app_name = 'forum'

 

urlpatterns = [
    url(r'^$', login_required(views.IndexView.as_view()), name='index'),
    url(r'^topic/(?P<pk>[0-9])/$', login_required(views.TopicDetailView.as_view()), name='detail'),
    url(r'^topic/add/$', login_required(views.TopicCreateView.as_view()), name='add_topic'),
]

What do I need to do to accomplish the same? 

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