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Python Django Basics Test Time Django TDD

Posted by Varsha Joshi
Varsha Joshi
Courses Plus Student 7,069 Points

Hello, I am getting a KeyError when trying to run my tests My code snapshot: https://w.trhou.se/ukyrawz5yq

Traceback (most recent call last):                                                                  File "/home/treehouse/workspace/karaoke/songs/tests.py", line 73, in test_performer_detail_view     self.assertIn(resp.context['performer'], self.performer.name)                                   File "/usr/local/pyenv/versions/3.5.0/lib/python3.5/site-packages/django/test/utils.py", line 6 4, in getitem                                                                                     raise KeyError(key)                                                                           KeyError: 'performer'

songs/models.py 
from django.db import models

  # * Performer model should: # * have a name # * return the name when turned into a string
class Performer(models.Model):
    name = models.CharField(max_length=255)

    def __str__(self):
        return self.name


class Song(models.Model):
    title = models.CharField(max_length=255)
    artist = models.CharField(max_length=255)
    length = models.IntegerField()
    performer = models.ForeignKey(Performer)

    def __str__(self):
        return '{} by {}'.format(self.title, self.artist)
songs/views.py 
from django.http import HttpResponse
from django.shortcuts import get_object_or_404, render

from .models import Performer, Song

def song_list(request):
    songs = Song.objects.all()
    return render(request, 'songs/song_list.html', {'songs': songs})

def song_detail(request, pk):
    song = get_object_or_404(Song, pk=pk)
    return render(request, 'songs/song_detail.html', {'song': song})

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

{% block title %}{{ performer.name }}{% endblock %}

{% block content %}
<h2>{{ performer.name }}</h2>
  {% for song in songs %}
    {{ song }}
  {% endfor %}
{% endblock %}

4 Answers

Renato Guzman
Renato Guzman
51,437 Points
Renato Guzman
Renato Guzman
51,437 Points 
return render(request, 'songs/performer_detail.html', {'Performer': performer})

Performer is uppercase in your context, it should be lowercase. The test (because of the error) is self.assertIn(resp.context['performer'], self.performer.name)
So in the context the performer with lowercase does not exist.

Varsha Joshi
PLUS
Varsha Joshi
Courses Plus Student 7,069 Points
Varsha Joshi
Varsha Joshi
Courses Plus Student 7,069 Points

I finally solved the challenge.:-) Thanks for helping me out.

Varsha Joshi
PLUS
Varsha Joshi
Courses Plus Student 7,069 Points
Varsha Joshi
Varsha Joshi
Courses Plus Student 7,069 Points

Thanks Renato, your suggestion solved the key error. But now I get Performer is not iterable. I dont get why the song tests work and performer ones dont..

Renato Guzman
Renato Guzman
51,437 Points
Renato Guzman
Renato Guzman
51,437 Points

It seems that your are missing context_data. Notice that you are iterating songs and the variable songs is not in the context from performer_detail. You have to add 'songs' to the context.