我正在使用模型表单在Django中向表中添加一行， 这是我的视图和表单文件
views.py
def add_ad_mod(request):
current_user = request.user
current_ip = get_client_ip(request)
selected = Temp.objects.filter(created_by_ip=current_ip).order_by('-created_at')[0]
selected_category = selected.cat
selected_town = selected.town
if request.method == 'POST':
add_ad_mod_form = AddAdModForm(request.POST, request.FILES, cat=selected_category, loc=selected_town)
if add_ad_mod_form.is_valid():
model_instance = add_ad_mod_form.save(commit=False)
model_instance.created_by = current_user.email
model_instance.category = selected_category
model_instance.town=selected_town
if request.user.is_superuser:
model_instance.is_active = True
else:
model_instance.is_active = False
add_ad_mod_form.save()
return redirect('dashboard')
else:
add_ad_mod_form = AddAdModForm(cat=selected_category, loc=selected_town)
context = {
'add_ad_mod_form': add_ad_mod_form,
'selected_category': selected_category,
'selected_town': selected_town,
}
return render(request, 'add_ad_mod.html', context)
我正在使用 views.py 将您看到的变量发送到表单本身
forms.py
class AddAdModForm(forms.ModelForm):
def __init__(self, *args, **kwargs):
current_categ = kwargs.pop('cat')
current_loc = kwargs.pop('loc')
super(AddAdModForm, self).__init__(*args, **kwargs)
self.fields['sub_category'] = forms.ModelChoiceField(label="Sniffer", queryset=SubCate.objects.filter(main_category=current_categ))
self.fields['sub_location'] = forms.ModelMultipleChoiceField (widget=forms.CheckboxSelectMultiple,label="Sniffer", queryset=SubLoc.objects.filter(main_town=current_loc))
title = forms.CharField(
widget=forms.TextInput(
attrs={
'placeholder': 'Ad Title here',
'style': 'width: 100%; max-width: 800px;'
}
)
)
description = forms.CharField(
widget=forms.Textarea(
attrs={
'placeholder': 'Ad description is here',
'style': 'width: 100%; max-width: 800px;'
}
)
)
image = forms.ImageField(required=True)
image2 = forms.ImageField(required=False)
image3 = forms.ImageField(required=False)
image4 = forms.ImageField(required=False)
image5 = forms.ImageField(required=False)
address = forms.CharField(max_length=100,
widget=forms.Textarea(
attrs={
'placeholder': 'Detailed Address is here ',
'style': 'width: 100%; max-width: 800px;'
}
)
)
class Meta:
model = Item
fields = ['title', 'sub_category', 'price', 'description', 'sub_location', 'address', 'image', 'image2', 'image3', 'image4',
'image5', 'phone']
这是我的 models.py 文件：
class Category(models.Model):
category_name = models.CharField(max_length=60)
def __str__(self):
return self.category_name
class Town(models.Model):
town_name = models.CharField(max_length=300)
def __str__(self):
return self.town_name
class SubCate(models.Model):
sub_category_name = models.CharField(max_length=100)
main_category = models.ForeignKey(Category, on_delete=CASCADE)
def __str__(self):
return self.sub_category_name
class SubLoc(models.Model):
sub_location_name = models.CharField(max_length=100)
main_town = models.ForeignKey(Town, on_delete=CASCADE)
def __str__(self):
return self.sub_location_name
class Item(models.Model):
category = models.ForeignKey(Category, on_delete=CASCADE)
sub_category = models.ManyToManyField(SubCate)
title = models.CharField(max_length=250)
description = models.TextField(max_length=1200)
price = models.IntegerField(default=0)
town = models.ForeignKey(Town, on_delete=CASCADE)
sub_location = models.ManyToManyField(SubLoc)
address = models.TextField(max_length=100)
image = models.ImageField(upload_to='media/', null=False, blank=False)
image2 = models.ImageField(upload_to='media/', null=True, blank=True)
image3 = models.ImageField(upload_to='media/', null=True, blank=True)
image4 = models.ImageField(upload_to='media/', null=True, blank=True)
image5 = models.ImageField(upload_to='media/', null=True, blank=True)
created_by = models.CharField(max_length=600)
created_at = models.DateField(auto_now=True)
phone = models.IntegerField(default=0)
is_active = models.BooleanField(default=False)
is_deleted = models.BooleanField(default=False)
def __str__(self):
return self.title
尽管这些项目已添加到数据库中，但是如果我重新加载了网站，我可以看到该项目已发布-它给了我错误而不是正常重定向（该错误不在用户提交后重定向到的页面中，因为我可以正常浏览）
Traceback:
File "C:\Users\lito\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\core\handlers\exception.py" in inner
35. response = get_response(request)
File "C:\Users\lito\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\core\handlers\base.py" in _get_response
128. response = self.process_exception_by_middleware(e, request)
File "C:\Users\lito\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\core\handlers\base.py" in _get_response
126. response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "C:\Users\lito\Desktop\DJ\JEHLUM - Copy - Copy\web_site\views.py" in add_ad_mod
219. add_ad_mod_form.save()
File "C:\Users\lito\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\forms\models.py" in save
457. self._save_m2m()
File "C:\Users\lito\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\forms\models.py" in _save_m2m
439. f.save_form_data(self.instance, cleaned_data[f.name])
File "C:\Users\lito\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\db\models\fields\related.py" in save_form_data
1619. getattr(instance, self.attname).set(data)
File "C:\Users\lito\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\db\models\fields\related_descriptors.py" in set
947. objs = tuple(objs)
Exception Type: TypeError at /add_ad/mod/
Exception Value: 'SubCate' object is not iterable
答案 0 :(得分：1)
正如我在评论中提到的那样，这两个字段似乎都应该是多选的，因为它们都表示模型中的ManyToManyFields。
self.fields['sub_category'] = forms.ModelMultipleChoiceField(label="Sniffer", queryset=SubCate.objects.filter(main_category=current_categ))
self.fields['sub_location'] = forms.ModelMultipleChoiceField (widget=forms.CheckboxSelectMultiple,label="Sniffer", queryset=SubLoc.objects.filter(main_town=current_loc))
也如上所述，您需要在模型实例上调用save，并在表单上调用save_m2m：
if add_ad_mod_form.is_valid():
model_instance = add_ad_mod_form.save(commit=False)
...
model_instance.save()
add_ad_mod_form.save_m2m()
return redirect('dashboard')