我正在尝试为以下模型创建一个formset:
class Category(models.Model):
name = models.CharField(max_length=100, unique=True)
description = models.TextField(null = True, blank=True)
class Recipe(models.Model):
title = models.CharField(max_length=100)
body = models.TextField()
user = models.ForeignKey(User)
categories = models.ManyToManyField(Category, null = True, blank = True)
但是每当我尝试实现一个formset时,就像这样:
FormSet = inlineformset_factory(Category, Recipe, extra=3)
formset = FormSet()
我收到一条错误,指出Category模型中没有ForeignKey。是否可以使用ManyToManyField构建表单集,或以某种方式复制此功能?
谢谢!
答案 0 :(得分:2)
根据源代码和文档,它仅用于外键
因此,如果您想为模型创建一个formset,则必须更改
categories = models.ManyToManyField(Category, null = True, blank = True)
到
categories = models.ForeignKey("Category", null = True, blank = True)
文档: https://docs.djangoproject.com/en/1.4/topics/forms/modelforms/#inline-formsets https://docs.djangoproject.com/en/1.4/topics/forms/modelforms/#more-than-one-foreign-key-to-the-same-model
Django来源:
def inlineformset_factory(parent_model, model, form=ModelForm,
formset=BaseInlineFormSet, fk_name=None,
fields=None, exclude=None,
extra=3, can_order=False, can_delete=True, max_num=None,
formfield_callback=None):
"""
Returns an ``InlineFormSet`` for the given kwargs.
You must provide ``fk_name`` if ``model`` has more than one ``ForeignKey``
to ``parent_model``.
"""