django错误“无法解包的值太多” [英] django error 'too many values to unpack'

问题描述

我正在通过构建一个简单的食谱应用程序来学习Django。我有一个1表模型，其中对食谱类别使用了选择字段选项，而不是使用第二个类别表和外键关系。所以我通过syncdb创建了数据库表，然后用测试数据加载了表。当我去管理并单击食谱链接以尝试查看食谱时，出现以下错误：

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

如果有人可以揭开这个神秘的错误，那就太好了。 Db是Sqlite。 Django版本是1.0。该模型在下面列出：

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)

推荐答案

编辑：根据kibibu的更正进行了更新。

我遇到了我相信是同样的错误，并产生以下消息：

I have encountered what I believe is this same error, producing the message:

Caught ValueError while rendering: too many values to unpack

我的表单类如下：

class CalcForm(forms.Form):
    item = forms.ChoiceField(choices=(('17815', '17816')))

请注意，我的选择在此处键入一个元组。 Django官方文档的 choices arg内容如下：

Note that my choices type here a tuple. Django official documentation reads as follows for the choices arg:

可迭代（例如（一个列表或元组）（包含2个元组）作为
此字段的选择。此参数接受与模型字段的
参数相同的格式。

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.

src： https://docs.djangoproject.com/en/1.3/ref/ form / fields /＃django.forms.ChoiceField.choices

这个问题是通过查看文档并使用元组的列表解决的：

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')])

请注意，尽管文档中声明了可以使用正确的格式，2元组的元组不起作用：

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')))

此产生了与以前相同的错误。

This produced the same error as before.

教训：发生了错误。

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