更新的答案
问题出在
save方法上。您将实例保存为，
commit=False但实例保存时为，
if commit:因此现在不保存。
只是注释掉了
if commit:，它将被很好地保存。
def save(self, commit=True): # Get the unsaved Pizza instance instance = forms.ModelForm.save(self, False) # Prepare a 'save_m2m' method for the form, old_save_m2m = self.save_m2m def save_m2m(): old_save_m2m() # This is where we actually link the pizza with toppings instance.course_set.clear() for course in self.cleaned_data['courses']: instance.course_set.add(course) self.save_m2m = save_m2m # Do we need to save all changes now? # Just like this # if commit: instance.save() self.save_m2m() return instance
