我在Django中有一个很好的显示模型 - 但它没有提取适当的信息。
出现选择下拉列表,但没有填充选项,我正在努力找出原因。
我的模特看起来像这样:
class Mileage(models.Model):
start_location = models.ForeignKey(Location, on_delete=models.PROTECT, related_name='start_locations')
end_location = models.ForeignKey(Location, on_delete=models.PROTECT, related_name='end_locations')
miles = models.DecimalField(max_digits=8, decimal_places=2)
user_id = models.IntegerField(null=True)
def __str__(self):
return self.miles
class Location(models.Model):
name = models.CharField(max_length=255)
address = models.CharField(max_length=255, null=True)
latitude = models.DecimalField(max_digits=9, decimal_places=6, null=True)
longitude = models.DecimalField(max_digits=9, decimal_places=6, null=True)
user_id = models.IntegerField(null=True)
def __str__(self):
return self.id
class Trip(models.Model):
start_location = models.CharField(max_length=255)
end_location = models.CharField(max_length=255)
miles = models.DecimalField(max_digits=7, decimal_places=2)
user = models.ForeignKey(User, on_delete=models.PROTECT)
trip_date = models.DateTimeField('trip date')
def __str__(self):
return self.id
我的ModelForm看起来像这样:
class TripsForm(ModelForm):
class Meta:
model = Trip
fields = ['start_location', 'end_location', 'miles', 'trip_date']
widgets = {
'start_location': forms.Select(
attrs={
'class': 'form-control',
'id': 'start_location'
}
),
'end_location': forms.Select(
attrs={
'class': 'form-control',
'id': 'end_location'
}
),
'miles': forms.NumberInput(
attrs={
'class': 'form-control',
'id': 'miles',
'readonly': 'readonly'
}
),
'trip_date': forms.TextInput(
attrs={
'class': 'form-control monthpicker datepicker',
'id': 'trip_date'
}
),
}
在我看来,我从view.py
:
# Create trip
def trip_create(request):
# if this is a POST request we need to process the form data
if request.method == 'POST':
form = TripsForm(request.POST)
# check whether it's valid:
if form.is_valid():
# Save the form -- will handle this all later
trip.save()
return HttpResponseRedirect('/thanks/')
# if a GET (or any other method) we'll create a blank form
else:
form = TripsForm()
# Return to trips with list of date
return render(request, 'trips/create.html', {'form': form})
'start_locations'和'end_locations'选项应该填充所有位置 - 目前选择是完全空的。
我一直在查看文档:在这种情况下,modelformset_factory()
是否需要深入研究?
我只是不确定如何让它填充这些下拉列表。
答案 0 :(得分:1)
目前,您使用CharField
Trip.start_location
和Trip.end_location
。如果您使用选择小部件,则由您自己创建选项以填充它。
如果您对ForeignKey
和start_location
字段使用end_location
,则Django会为您填充选项。
class Trip(models.Model):
start_location = models.ForeignKey(Location, on_delete=models.PROTECT, related_name='trip_start_locations')
end_location = models.ForeignKey(Location, on_delete=models.PROTECT, related_name='trip_end_locations')
在模型中进行更改后,您必须进行迁移,然后进行迁移。
请注意,我在trip
中添加了related_name
,因为相关名称用于将您从Location
模型带回Trip
。您可能希望更新related_name
模型的Mileage
以包含mileage
。