On 5/3/2009 12:59 AM, notcourage wrote:
> I'm interested in hearing how you cope w/ the problem of specifying
> ManyToMany relationships in an object creation view. Consider two
> models M1 & M2 and a creation view/form for M1. A technique I'm using
> is to specify M2 values as an unbound field in a ModelForm for M1.
> When the form validates:
> m1Form.save()
> I convert m1Form['m2'] into ManyToMany relationship chgs. This works
> but it defeats the purpose of ModelForm.
>
> I'm making use of a scrolling <div> of checkboxes instead of a shuttle
> widget (takes up too much space) or a multi-select widget (easy to
> mess up the selection). I'm considering creating a custom widget for
> the MultipleChoiceField. Is this practical or a good idea?
I don't think you need to create a custom widget. There's already a
`CheckboxSelectMultiple` widget that you can use.
{{{
from django.db import models
from django import forms
class Pizza(models.Model):
name = models.CharField(max_length=50)
toppings = models.ManyToManyField('Topping')
def __unicode__(self):
return self.name
class Topping(models.Model):
name = models.CharField(max_length=50)
def __unicode__(self):
return self.name
class PizzaForm(forms.ModelForm):
TOPPINGS_CHOICES = [(t.pk, t) for t in Topping.objects.all()]
toppings = forms.MultipleChoiceField(
choices=TOPPINGS_CHOICES, widget=forms.CheckboxSelectMultiple)
class Meta:
model = Pizza
>>> from m2m.models import PizzaForm
>>> f = PizzaForm()
>>> print f['toppings']
<ul>
<li><label for="id_toppings_0"><input type="checkbox" name="toppings"
value="1"
id="id_toppings_0" /> Pesto</label></li>
<li><label for="id_toppings_1"><input type="checkbox" name="toppings"
value="2"
id="id_toppings_1" /> Garlic</label></li>
</ul>
}}}
--
George
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