Django : How to filter in form -

i have model

class demande_expertise(models.model):     user = models.foreignkey(user)     material = models.charfield(_('material'), max_length=30)     categorie =  models.foreignkey("category")  class category(models.model):     name = models.charfield(_('name'), max_length=50) 

i have class category records : alloys, ceramic, composite, cu_based, metals, pure_metals, ni_based

form

class demande_expertiseform(forms.modelform):     class meta:         model = demande_expertise         exclude =  ('etat',)      def __init__(self, *args, **kwargs):         super(demande_expertiseform, self).__init__(*args, **kwargs) 

template

<td>{{ form.categorie}}</td> 

how form if want have template : ceramic, cu_based, ni_based ?

if write in demande_expertiseform

self.fields['categorie'].queryset = category.objects.filter(name__icontains="cu_based") 

i filter cu_based

if want filter ceramic, cu_based, ni_based how ?

you can use 'q'

from django.db.models import q  self.fields['categorie'].queryset = category.objects.filter(q(name__icontains = 'cu_based') | q(name_icontains = 'ceramic') | q(name_icontains = 'ni_based'))