I'm attempting to create a formset for the following models:
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)
But any time I try to implement a formset, like so:
FormSet = inlineformset_factory(Category, Recipe, extra=3)
formset = FormSet()
I get an error stating that no ForeignKey is present in the Category model. Is it possible to build a formset using a ManyToManyField, or to replicate this functionality in some way?
Thanks!
According to source code and documentation its only for foreign keys
So if you want create a formset for your models you have to change
categories = models.ManyToManyField(Category, null = True, blank = True)
to
categories = models.ForeignKey("Category", null = True, blank = True)
Documentation: 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 source:
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``.
"""
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