Django InstanceLinkWidget

instancelinkwidget.py

from django import forms
from django.utils.safestring import  mark_safe
from django.core.urlresolvers import reverse

class InstanceLinkWidget(forms.Widget):

	def __init__(self, obj, attrs=None):
		self.obj = obj
		super(InstanceLinkWidget, self).__init__(attrs)

	def render(self, name, value, attrs=None):
		if self.obj.pk:
			url = reverse('admin:{0}_{1}_change'.format(
				self.obj._meta.app_label,
				self.obj._meta.model_name),
				args=(self.obj.pk,))
			return mark_safe(u'<a href="{0}">{1}</a>'.format(url, self.obj))
		else:
			return mark_safe(u'---')

	def value_from_datadict(self, data, files, name):
		return unicode(self.obj.pk)



class MyForm(forms.ModelForm):

	def __init__(self, *args, **kwargs):
		super(MyForm, self).__init__(*args, **kwargs)
		self.fields['anothermodel'].widget = InstanceLinkWidget(self.instance.anothermodel)