Adding Lookups to Django Generic Foreign Keys with Tabular Inlines

admin.py

from itertools import chain
from django.utils.safestring import mark_safe
from django import forms
from django.contrib.contenttypes.models import ContentType
from django.forms import ModelForm
from django.contrib.admin.widgets import ForeignKeyRawIdWidget
from django.db.models.fields.related import ManyToOneRel
from django.contrib.admin.sites import site


class ContentTypeSelect(forms.Select):
    def __init__(self, lookup_id,  attrs=None, choices=()):
        self.lookup_id = lookup_id
        super(ContentTypeSelect, self).__init__(attrs, choices)

    def render(self, name, value, attrs=None, choices=()):
        output = super(ContentTypeSelect, self).render(name, value, attrs, choices)

        choices = chain(self.choices, choices)
        choiceoutput = ' var %s_choice_urls = {' % (attrs['id'].replace('-', ''),)
        for choice in choices:
            try:
                ctype = ContentType.objects.get(pk=int(choice[0]))
                choiceoutput += '    \'%s\' : \'../../../%s/%s/?t=%s\','  % ( str(choice[0]),
                    ctype.app_label, ctype.model, ctype.model_class()._meta.pk.name)
            except:
                pass
        choiceoutput += '};'

        output += ('<script type="text/javascript">'
                   '(function($) {'
                   '%(choiceoutput)s'
                   '    $(\'#%(id)s\').change(function() {'
                   '        $(\'#%(fk_id)s\').attr(\'href\',%(change_id)s_choice_urls[$(this).val()]);'
                   '    });'
                   '})(django.jQuery);'
                   '</script>' % {'choiceoutput': choiceoutput,
                                    'id': attrs['id'],
                                    'change_id': attrs['id'].replace('-', ''),
                                    'fk_id': "lookup_%sobject_id" % attrs['id'].replace('content_type', '')
                                  })
        return mark_safe(u''.join(output))


class AdminRatingForm(ModelForm):

    def __init__(self, *args, **kwargs):
            super(AdminRatingForm, self).__init__(*args, **kwargs)
            try:
                model = self.instance.content_type.model_class()
                model_key = model._meta.pk.name
            except:
                model = Article
                model_key = 'id'
            self.fields['object_id'].widget = ForeignKeyRawIdWidget(rel=ManyToOneRel(model, model_key), admin_site=site)
            self.fields['content_type'].widget.widget = ContentTypeSelect('lookup_id_object_id',
                            self.fields['content_type'].widget.widget.attrs,
                            self.fields['content_type'].widget.widget.choices)

    class Meta:
        model = ReleatedResource

class GenericItemInline(admin.TabularInline):
    model = ReleatedResource
    form = AdminRatingForm

change_form.html

    {% extends "admin/change_form.html" %}

    {% block extrahead %}{{ block.super }}
    <script type="text/javascript" src="/static/js/lib/jquery/jquery-1.6.1.min.js"></script>
    <script>
     $(document).ready(function(){
    	 $(".object_id").append("<div id='lookup_box'></div>");
	     $("#id_object_type").change(function () {

          var type = $("#id_object_type option:selected").text();
          var good_choice = true;
          if (type == 'sermon' || type == 'devotional' || type == 'article' || type == 'region') {
			  var link_root = '../../../common/';
			  $("#lookup_box").html("<a onclick='return showRelatedObjectLookupPopup(this);' id='lookup_id_object_id' class='related-lookup' href='../../../common/region/'>lookup</a>");
	          $("#lookup_id_object_id").text("Lookup " + type);
	          $("#lookup_id_object_id").attr('href', link_root + type + '/');
          } else {
          	  $("#lookup_box").html("<span class='related-lookup' style='color: red;'>Invalid Choice! - Pick City, State, Country or Region</span>");
          }
        })
        .change();

     });
    </script>
    
    {% endblock %}