I'm learning Django by building a simple recipes app. I have a 1 table model using the 'choices' field option for recipe categories rather than using a 2nd 'categories' table and a foreign key relationship. So i created db table via syncdb and then loaded table with test data. When i go to admin and click on the 'Recipes' link in an attempt to view recipes i get the following error:
Template error In template /var/lib/python-support/python2.6/django/contrib/admin/templates/admin/change_list.html, error at line 34 Caught an exception while rendering: too many values to unpack
If anyone can shed light on this cryptic error that would be great. Db is Sqlite. Django version is 1.0. The model is listed below:
from django.db import models class Recipe(models.Model): CATEGORY_CHOICES = ( (1, u'Appetizer'), (2, u'Bread'), (3, u'Dessert'), (4, u'Drinks'), (5, u'Main Course'), (6, u'Salad'), (7, u'Side Dish'), (8, u'Soup'), (9, u'Sauce/Marinade'), (10, u'Other'), ) name = models.CharField(max_length=255) submitter = models.CharField(max_length=40) date = models.DateTimeField() category = models.SmallIntegerField(choices=CATEGORY_CHOICES) ingredients = models.TextField() directions = models.TextField() comments = models.TextField(null=True, blank=True)
Edit: Updated in light of kibibu's correction.
I have encountered what I believe is this same error, producing the message:
Caught ValueError while rendering: too many values to unpack
My form class was as follows:
class CalcForm(forms.Form): item = forms.ChoiceField(choices=(('17815', '17816')))
Note that my
choices type here a tuple. Django official documentation reads as follows for the
An iterable (e.g., a list or tuple) of 2-tuples to use as choices for this field. This argument accepts the same formats as the choices argument to a model field.
This problem was solved by my observing the documentation and using a list of tuples:
class CalcForm(forms.Form): item = forms.ChoiceField(choices=[('17815', '17816')])
Do note that while the docs state any iterable of the correct form can be used, a tuple of 2-tuples did not work:
item = forms.ChoiceField(choices=(('17815', '17816'), ('123', '456')))
This produced the same error as before.
Lesson: bugs happen.