Django的inlineformset_factory和多對多領域

Question

我試圖創建以下型號一個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) 

但我嘗試實施一個formset，像這樣的任何時間：

FormSet = inlineformset_factory(Category, Recipe, extra=3) 
     formset = FormSet() 

我得到一個錯誤，說明類別模型中沒有ForeignKey。是否可以使用ManyToManyField構建一個formset，或以某種方式複製此功能？

謝謝！

Answer 1

據其僅適用於外鍵

所以，如果你想爲你的模型，你必須改變

categories = models.ManyToManyField(Category, null = True, blank = True) 

到

categories = models.ForeignKey("Category", null = True, blank = True) 

文檔一個formset源代碼和文檔： 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的來源：

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``. 
    """