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    <p>I started from your code and I used a custom javascript to retrieve values from photologue Photo model; please note that I'm using grappelli and the Django url that get the json object is hardcoded; also the field in my model is called "photos": </p> <pre><code># urls.py url(r'^get_json_photos/(?P&lt;query&gt;[\w-]+)/$', 'catalogo.views.get_json_photos', name='get_json_photos'), # views.py from photologue.models import Photo from django.utils import simplejson as json def get_json_photos(request, query): photos = Photo.objects.filter(title__icontains=query)[:20] p = [ {"name":photo.title, "id":photo.id} for photo in photos ] response = json.dumps(p) return HttpResponse(response, mimetype="application/json") # admin.py from django.conf import settings from django.contrib.admin.widgets import FilteredSelectMultiple class MyFilteredSelectMultiple(FilteredSelectMultiple): class Media: js = (settings.ADMIN_MEDIA_PREFIX + "js/core.js", settings.ADMIN_MEDIA_PREFIX + "js/SelectBox.js", settings.ADMIN_MEDIA_PREFIX + "js/SelectFilter2.js", settings.MEDIA_URL + "js/ajax_photo_list.js") class MyModelMultipleChoiceField(ModelMultipleChoiceField): def clean(self, value): return [val for val in value] class GalleryForm(forms.ModelForm): photos = MyModelMultipleChoiceField(queryset=Photo.objects.none(), required=False, widget=MyFilteredSelectMultiple(verbose_name="photos", is_stacked=False)) def __init__(self, *args, **kwargs): super(GalleryForm, self).__init__(*args, **kwargs) try: i = kwargs["instance"] gallery = Gallery.objects.get(pk=i.pk) qs = gallery.photos.all() except: qs = Photo.objects.none() self.fields['photos'].queryset = qs class Meta: model = Gallery widgets = { 'photos': MyFilteredSelectMultiple(verbose_name="photos", is_stacked=False) } class GalleryAdmin(admin.ModelAdmin): list_display = ('title', 'date_added', 'photo_count', 'is_public') list_filter = ['date_added', 'is_public'] date_hierarchy = 'date_added' prepopulated_fields = {'title_slug': ('title',)} filter_horizontal = () form = GalleryForm # ajax_photo_list.js (function($){ $("#id_photos_input").live("keyup", function(){ var querystring = $("#id_photos_input").val(); if (querystring) { $.ajax ({ type: "GET", url: "/get_json_photos/"+querystring+"/", cache: false, success: function(json) { if (json) { var list_from = $("#id_photos_from option").map(function() { return parseInt($(this).val()); }); var list_to = $("#id_photos_to option").map(function() { return parseInt($(this).val()); }); for (var pid in json) { if ($.inArray(json[pid].id, list_from) == -1 &amp;&amp; $.inArray(json[pid].id, list_to) == -1) { $("#id_photos_from").prepend("&lt;option value='"+json[pid].id+"'&gt;"+json[pid].name+"&lt;/option&gt;"); } } SelectBox.init('id_photos_from'); SelectBox.init('id_photos_to'); } } }); } }) }(django.jQuery)); </code></pre> <p>I'm thinking to make it generic, since is not the first time that I have this problem,</p>
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