[Fixed]-TypeError: coercing to Unicode: need string or buffer, NoneType found

by

1👍

In your model, update method called __str__(self).

class Choice(models.Model):
    choice_text = models.CharField(max_length=255, null=True)

    def __str__(self):
       return self.choice_text if self.choice_next else ''
👤ruddra

0👍

In fact, it was needed only to add return to str before self.choice_text.

👤Павел Иванов

0👍

You are using @python_2_unicode_compatible, so you should there is no need to define __unicode__ and __str__.

You only need to define __unicode__ if you are using Python 2 without the @python_2_unicode_compatible decorator.

You should change your models to something like:

@python_2_unicode_compatible
class Question(models.Model):
    question_text = models.CharField(max_length=200)
    pub_date = models.DateTimeField('date published')

    def __str__(self):
        return self.question_text

    def was_published_recently(self):
        return self.pub_date >= timezone.now() - datetime.timedelta(days=1)

@python_2_unicode_compatible
class Choice(models.Model):
    question = models.ForeignKey(Question, on_delete=models.CASCADE)
    choice_text = models.CharField(max_length=200)
    votes = models.IntegerField(default=0)

    def __str__(self):
        self.choice_text

You shouldn’t need code like unicode(self.choice_text) or u'' in your methods – the CharField should default to the empty string when a value isn’t set.

👤Alasdair

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