字段选择()作为查询? [英] field choices() as queryset?
问题描述
模型看起来像这样:
class Province(models.Model):
name = models.CharField (max_length = 30)
slug = models.SlugField(max_length = 30)
def __unicode __(self):
return self.name
它的行仅由管理员添加,但所有用户都可以在表单中查看。
我想从中创建一个ModelForm。我做了这样的事情:
class ProvinceForm(ModelForm):
class Meta:
选择=省.objects.all()
model =省
fields =('name',)
widgets = {
'name':Select(choices = CHOICES) ,
}
但它不起作用。选择标签不显示在html中。我的错误是什么?
更新:
>
class ProvinceForm(ModelForm):
def __init __(self,* args,** kwargs):
super省钱,自我).__ init __(* args,** kwargs)
user_provinces = UserProvince.objects.select_related()。filter(user__exact = self.instance.id).values_list('province')
self .fields ['name']。queryset = Province.objects.exclude(id__in = user_provinces).only('id','name')
name = forms.ModelChoiceField(queryset = None,empty_label =无)
class Meta:
model =省
fields =('name',)
阅读Maersu的工作方法的答案。
如果你想自定义,知道选择需要一个元组列表,即(('val','display_val'),(。 ..),...)
选择doc:
一个可迭代(例如,列表或元组)
2元组的,以作为此
字段的选择使用。
'pre>
从django.forms.widgets导入选择
类ProvinceForm(的ModelForm):
类元:
的选择= Province.objects.all()
型=省
栏=( '名称')
部件= {
'名' :select(choices =((x.id,x.name)for x in CHOICES)),
}
I need to make a form, which have 1 select and 1 text input. Select must be taken from database. model looks like this:
class Province(models.Model):
name = models.CharField(max_length=30)
slug = models.SlugField(max_length=30)
def __unicode__(self):
return self.name
It's rows to this are added only by admin, but all users can see it in forms. I want to make a ModelForm from that. I made something like this:
class ProvinceForm(ModelForm):
class Meta:
CHOICES = Province.objects.all()
model = Province
fields = ('name',)
widgets = {
'name': Select(choices=CHOICES),
}
but it doesn't work. The select tag is not displayed in html. What did I wrong?
UPDATE:
This solution works as I wanto it to work:
class ProvinceForm(ModelForm):
def __init__(self, *args, **kwargs):
super(ProvinceForm, self).__init__(*args, **kwargs)
user_provinces = UserProvince.objects.select_related().filter(user__exact=self.instance.id).values_list('province')
self.fields['name'].queryset = Province.objects.exclude(id__in=user_provinces).only('id', 'name')
name = forms.ModelChoiceField(queryset=None, empty_label=None)
class Meta:
model = Province
fields = ('name',)
Read Maersu's answer for the method that just "works".
If you want to customize, know that choices takes a list of tuples, ie (('val','display_val'), (...), ...)
Choices doc:
An iterable (e.g., a list or tuple) of 2-tuples to use as choices for this field.
from django.forms.widgets import Select
class ProvinceForm(ModelForm):
class Meta:
CHOICES = Province.objects.all()
model = Province
fields = ('name',)
widgets = {
'name': Select(choices=( (x.id, x.name) for x in CHOICES )),
}
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