manytomany field in form with checkboxes insted select field in django template

问题

I have model with ManyToManyField. Now I need form but don't need select field in template.

class Foo(models.Model):
    name = models.CharField(max_length=50)
    short_description = models.CharField(max_length=100)
    price = models.IntegerField()

    def __unicode__(self):
        return self.name

class Bar(models.Model):
    foo = models.ManyToManyField(Foo, blank=True, null=True, related_name='foos')

    def __unicode__(self):
        return unicode(self.id)

What I really need is to display all data from the Foo model with checkboxes in template, instead of select field which I have if use model.Form and {{ form }} call in template.

class BarForm(forms.ModelForm):
    class Meta:
        model = Bar

view.py

def show_form(request, id):
    foo = get_object_or_404(Foo, id=id)
    form = BarForm()
    ...

回答1:

To show a ManyToManyField as checkboxes instead of a select field, you need to set the widget in the Meta class of the appropriate ModelForm subclass. Then to show a custom label on each checkbox, create your own form field class derived from ModelMultipleChoiceField, and override label_from_instance. You may also add HTML tags to the string returned by label_from_instance to make it look as pretty as you want, but remember to wrap the returned string with mark_safe.

from django.forms.widgets import CheckboxSelectMultiple
from django.forms.models import ModelMultipleChoiceField
...
class CustomSelectMultiple(ModelMultipleChoiceField):
    def label_from_instance(self, obj):
        return "%s: %s %s" %(obj.name, obj.short_description, obj.price)

class BarForm(forms.ModelForm):
    foo = CustomSelectMultiple(queryset=Foo.objects.all())
    class Meta:
        model = Bar
        widgets = {"foo":CheckboxSelectMultiple(),}

来源：https://stackoverflow.com/questions/8630977/manytomany-field-in-form-with-checkboxes-insted-select-field-in-django-template