如何解决使用来自 postgres 数组字段的值在 Django 视图中呈现下拉列表
以下是模型中的示例:
class Shipment(models.Model):
shipment_id = models.BigAutoField(null=False,primary_key=True)
potential_shipping_dates = ArrayField(models.DateField(),verbose_name='Ship Dates',null=True)
以下是我正在尝试的形式:
class ShippingForm(forms.Form):
potential_shipping_dates = forms.ModelChoiceField(queryset=Shipment.objects.all())
def __init__(self,*args,**kwargs):
super(ShippingForm,self).__init__(*args,**kwargs)
这里是我的表单被添加到上下文的地方:
context['shippingForm'] = ShippingForm(initial=??what_goes_here_maybe??)
我的表单呈现良好,但我想为每个选项显示一个带有日期的下拉列表。
解决方法
好吧,这有点复杂,但我想我明白你想要做什么,你哪里出错了。
所以您有一个 Shipment 模型,每个 Shipment 实例都有一个字段,其中包含几个不同的 potential_shipping_dates
。
假设您有 2 批货物:
IN : ship1 = Shipment.objects.first()
OUT:
IN : ship1.potential_shipping_dates
OUT: ['01/01/2021','02/02/2021']
IN : ship2 = Shipment.objects.last()
OUT:
IN : ship2.potential_shipping_dates
OUT: ['03/03/2021','04/04/2021']
现在,您是否希望下拉菜单包含所有 4 个日期作为可能性,并选择 Shipment
?
还是要在表格中选择货件后选择日期?
^^ 在评论中回答
好的,所以您需要将实例传递给表单:
views.py
# Inherit from Django's UpdateView to have `instance` passed through to the form
class ShippingFormView(UpdateView):
model = Shipment
form_class = ShippingForm
# Or if you don't want to inherit from inherit from UpdateView
class ShippingFormView(Blah):
model = Shipment
form_class = ShippingForm
def get_form_kwargs(self):
kwargs = super().get_form_kwargs()
kwargs['instance'] = self.get_object()
return kwargs
# Or if you're using function based views
def shipping_form_view(request,pk):
shipment = get_object_or_404(Shipment,pk=pk)
form = ShippingForm(request,instance=shipment)
...
forms.py
class ShippingForm(forms.Form):
potential_shipping_dates = forms.ChoiceField(choices=[])
def __init__(self,*args,instance,**kwargs):
super(ShippingForm,self).__init__(*args,**kwargs)
self.fields['potential_shipping_dates'].choices = ((dt,dt) for dt in instance.potential_shipping_dates)
ModelChoiceFields
用于选择 object
,而不是一个属性。
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