Django Model with a CharField gives unicode error if quote in string

Question

This is my form which uses a model called modelQuizQuestion. This model has a char field in it. Now everything works fine if the char field in that model does not have a quote in it. Otherwise I get an exception on form.is_valid() which is

UnicodeEncodeError: 'ascii' codec can't encode character u'\xa0' in position 20: ordinal not in range(128)

class DynamicQuizForm(forms.Form):
    def __init__(self, patient, *args, **kwargs):
        super(DynamicQuizForm, self).__init__(*args, **kwargs)

        question_qset = modelQuizQuestion.objects.filter(patient=patient)
        counter = 0
        for question in question_qset:
            counter+=1
            #Construct choices
            choice_qset = modelQuizChoice.objects.filter(question=question)
            main_choices = []
            for choice in choice_qset:
                small_choices = []
                small_choices.append(choice.choice)
                small_choices.append(choice.choice)
                main_choices.append(small_choices)

                self.fields[question.question] = forms.ChoiceField(choices=main_choices, widget=forms.RadioSelect(),)

and this is how I am using it

 if request.method == "POST":
    quizForm = DynamicQuizForm(patient=patient_qset, data=request.POST)
    if quizForm.is_valid(): #<------------ gives exception here
           .....

Any suggestions why this might be happening. I looked at these two links link1 and link2

However it seems like it is a unicode issue and the answers recommend to use decode instead of str. Howeever in my code I am not using str anywhere

Update

I believe the reason for this issue is because of the statement

self.fields[question.question] = forms.ChoiceField(choices=main_choices, widget=forms.RadioSelect(),)

and this only occurs if question.question has a string with apostrophe in it.

This is the question model

class modelQuizQuestion(models.Model):
    patient = models.ManyToManyField(modelPatient,default=None,blank=True)
    question = models.CharField(max_length=800, unique=True)

    class Meta:
        verbose_name_plural = "Questions in the Quizes"

    def __unicode__(self):
        return "Question : " +self.question

Any suggestions on how i can fix this ?

declare the # -*- encoding: utf-8 -*- in the file does not solve? — Flavio Milan, Aug 09 '17 at 00:07

score 0 · Answer 1 · answered Aug 09 '17 at 19:49

Type on the first line of all files:

# -*- coding: utf-8 -*-

Try to implement the following class:

class modelQuizQuestion(models.Model):
    patient = models.ManyToManyField(modelPatient,default=None,blank=True)
    question = models.CharField(max_length=800, unique=True)

    class Meta:
        verbose_name_plural = "Questions in the Quizes"

    def __str__(self):
        return "Question: %s" % self.question

If you're using python 3 and you want it to be compatible with the python 2, use the decorator python2_unicode_compatible

from django.utils.encoding import python2_unicode_compatible

@python2_unicode_compatible
class modelQuizQuestion(models.Model): ...

If you have more questions, check the documentation for Django. I advise you take a look at Choosing between str() and unicode()

https://docs.djangoproject.com/pt-br/1.11/ref/unicode/

Django Model with a CharField gives unicode error if quote in string

1 Answers1