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    <p>You're going to want to make these actual models, so you'd have something like this:</p> <pre><code>class ProgrammingCategory(models.Model): name = models.CharField(max_length=200) class ProgrammingLanguage(models.Model): category = models.ForeignKey(ProgrammingCategory, related_name='languages') name = models.CharField(max_length=300) class UserProfile(models.Model): user = models.ForeignKey(User, unique=True) planguages = models.ManyToManyField(ProgrammingLanguage) </code></pre> <p>Not only is this better from a maintainability standpoint (programming languages do change: new ones come around, old ones die out), but it also gives you much greater flexibility in querying.</p> <p>Then, you simply add a field to your <code>ModelForm</code> for the categories:</p> <pre><code>class UserProfileForm(forms.ModelForm): ... category = forms.ModelChoiceField(queryset=ProgrammingCategory.objects.all(), required=False) </code></pre> <p>And, in your form, you'll end up with a select with a complete list of categories and another with a complete list of languages. Then, all you need is some AJAX to do the filtering for you:</p> <p><strong>views.py</strong></p> <pre><code>from django.core import serializers from django.http import HttpResponse, HttpResponseBadRequest def ajax_get_languages_for_category(request): cat_id = request.GET.get('cat_id') if cat_id is not None: category = get_object_or_404(ProgrammingCategory, id=cat_id) data = serializers.serialize('json', category.languages.all()) return HttpResponse(data, mimetype='application/json') else: return HttpResponseBadRequest() </code></pre> <p><strong>script.js</strong></p> <pre><code>$(document).ready(function(){ var $category = $('#id_category'); function updateLanguageChoices() { var selected = $category.val(); if (selected) { $.getJSON('/path/to/ajax/view/', { cat_id: selected }, function (data, jqXHR) { var output = []; $.each(data, function(i, item){ output.append('&lt;option value="'+item.id+'"&gt;'+item.name+'&lt;/option&gt;'); }); $('#id_planguage').html(output.join('')); }); } } updateLanguageChoices(); $category.change(updateLanguageChoices); }); </code></pre>
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    1. COI need 15 rep points to vote up your answer, but if I had, I'd give it 200 votes, if I could. Thanks a lot!
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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