English 中文(简体)
How can I use multiple queryset in a ModelChoiceField?
原标题:

I m just beginning to learn Django and I would like to use different queryset in a ModelChoiceField.

I have 3 models like that :

class Politic(models.Model):
    name = models.CharField(max_length=100)

class Economic(models.Model):
    name = models.CharField(max_length=100)

class Category(models.Model):
    politic = models.ForeignKey(Politic, blank = True, null = True)
    economic = models.ForeignKey(Economic, blank = True, null = True)

And a form like that :

class MyForm(forms.Form):
    choice = forms.ChoiceField(choices = (("0", u"---------"), ("1", u"Politic"), 
                                          ("2",  u"Economic")),
                               required=False)

    category = forms.ModelChoiceField(queryset=Economic.objects.all(), 
                                      required=False)

In my template, I use Ajax to populate my category field with a list of all Politic or Economic value according to my choice field.
But if I choose "Politic", I have a problem in the validation of my form because the queryset of my category field is Economic.objects.all(), not Politic.objects.all().
How can I change my dynamicaly queryset? Any ideas?

问题回答

You can have 2 different selects One for politic and one for economic and show/hide them based on choice field.

Or maybe Abstract Model Inheritance would solve your problem

One possibility would be to use a Generic Relation in your Catagory model.

Thanks for your answers, I try to use your two solutions (Abstract Model and Generic Relation) but it doesn t resolve my problem.
So I create two differents ModelChoiceField (one for Politic and one for Economic) and I use hide/show effects of Jquery in my template (like you say Kugel).
But if you have any others ideas for my problem, I m interessed.





相关问题
How to get two random records with Django

How do I get two distinct random records using Django? I ve seen questions about how to get one but I need to get two random records and they must differ.

Moving (very old) Zope/Plone Site to Django

I am ask to move data from a (now offline) site driven by Plone to a new Django site. These are the version informations I have: Zope Version (unreleased version, python 2.1.3 ) Python Version 2.1....

Can Django models use MySQL functions?

Is there a way to force Django models to pass a field to a MySQL function every time the model data is read or loaded? To clarify what I mean in SQL, I want the Django model to produce something like ...

Flexible pagination in Django

I d like to implement pagination such that I can allow the user to choose the number of records per page such as 10, 25, 50 etc. How should I go about this? Is there an app I can add onto my project ...

is it convenient to urlencode all next parameters? - django

While writing code, it is pretty common to request a page with an appended "next" query string argument. For instance, in the following template code next points back to the page the user is on: &...

Pragmatically adding give-aways/freebies to an online store

Our business currently has an online store and recently we ve been offering free specials to our customers. Right now, we simply display the special and give the buyer a notice stating we will add the ...

热门标签