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Python Django Basics Test Time Django TDD

i am stuck

last challenge

from django.db import models

class Song(models.Model):
    title = models.CharField(max_length=30)
    artist = models.CharField(max_length=30)
    performer = models.ForeignKey('Performer')
    length = models.PositiveIntegerField(default=0)

    def __str__(self):
        return '{} by {}'.format(self.title, self.artist)

class Performer(models.Model):
    name = models.CharField(max_length=30)

    def __str__(self):
        return self.name
from django.shortcuts import render
from django.views import generic

from .models import Song, Performer

class SongListView(generic.ListView):
    model = Song
    context_object_name = 'songs'
    template_name = 'songs/song_list.html'

class PerformerDetailView(generic.DetailView):
    model = Performer
    context_object_name = 'performer'
    template_name = 'songs/performer_detail.html'

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context['performer'] = Performer.objects.get(pk=self.kwargs['pk'])
        return context

class SongDetailView(generic.DetailView):
    model = Song
    context_object_name = 'song'
    template_name = 'songs/song_detail.html'

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context['song'] = Song.objects.get(pk=self.kwargs['pk'])
        return context

    def performer_detail(request,pk):
        performer = get_object_or_404(Performer,pk=pk)
        return render(request,'songs/performer_detail.html',{'performer':performer})
{% extends 'base.html' %}

{% block title %}{{ performer }}{% endblock %}

{% block content %}
<h2>{{ performer }}</h2>
    {% for song in performer.song_set.all %}
        <li>{{ song }}</li>
    {% endfor %}
{% endblock %}