Can't add new function to models/table class in django (python)

Question

Here's the issue I'm currently having:

I'm running through the first django tutorial on Windows using Command Prompt
I've created a table called 'Question' in models.py.
I'm attempting to create a __str__() function within this class like following:

.

from django.db import models
class Question(models.Model):
   def __str__(self):
     return self.question_text`

This is how my models.py looks:

from django.db import models

class Question(models.Model):
    question_text = models.CharField(max_length=200)
    pub_date = models.DateTimeField('date published')
class Choice(models.Model):
    question = models.ForeignKey(Question)
    choice_text = models.CharField(max_length=200)
    votes = models.IntegerField(default=0)

The error I'm receiving is the following:

Traceback (most recent call last):
File "<console>", line 1, in <module>
File "C:\Python34\lib\site-packages\django\db\models\base.py", line 117, in __new__
kwargs = {"app_label": package_components[app_label_index]}
IndexError: list index out of range

Anyone got any idea? I'm a total noob to django, and I'm not 100% sure what base.py should be doing here.

Base.py can be found here: https://github.com/django/django/blob/master/django/db/models/base.py

TehTris · Accepted Answer · 2014-10-15 17:27:35Z

1

you are almost there

you need to add the def __str__() method inside of the Question class inside of models.py file like.

your models.py should look like this:

from django.db import models

class Question(models.Model):
    question_text = models.CharField(max_length=200)
    pub_date = models.DateTimeField('date published')
    def __str__(self):
        return self.question_text
class Choice(models.Model):
    question = models.ForeignKey(Question)
    choice_text = models.CharField(max_length=200)
    votes = models.IntegerField(default=0)
    def __str__(self):
        return self.choice_text #or whatever u want here, i just guessed u wanted choice text

what you are actually doing is overriding a built in dunder method in a class you are subclassing. models.Model itself has a __str__ method inside it already, and you are just modifying its behavior in your Question version of models.Model

PS. the method name should be __unicode__ instead of __str__ if you are on python 2

PPS. a little bit of OOP language: if a "function" is part of a class, it is called a "method"

edited Oct 15, 2014 at 17:27

answered Oct 14, 2014 at 22:37

TehTris

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1 Comment

TehTris Over a year ago

it happens, check out this article on sublcassing/inheritance, because often it helps to see WHY you are doing something to understand why its not working

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