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PODjango: AJAX ManyToManyField in admin
 

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    <p>I want to display <code>ManyToManyField</code>s in admin just like <code>filter_horizontal</code> does, but populate the options as the user types into the filter field. There are many options and loading them all at once takes a lot of time. </p> <p>I found <a href="http://code.google.com/p/django-ajax-filtered-fields/" rel="noreferrer">django-ajax-filtered-fields</a> but it seems to me an overkill as it requires changes to model classes, when all I want to do is to replace every multiple select field in a form.</p> <p>Writing a custom widget field that inherits from <code>admin.widgets.FilteredSelectMultiple</code> seems to be the right way. So I am trying to roll my own widget:</p> <pre><code>class MultiSelectWidget(FilteredSelectMultiple): class Media: # here should be some js to load options dynamically js = ( "some_js_to_load_ajax_options.js", ) def render_options(self, choices, selected_choices): # this initializes the multiple select without any options choices = [c for c in self.choices if str(c[0]) in selected_choices] self.choices = choices return super(MultiSelectWidget, self).render_options([], selected_choices) class MyAdminForm(forms.ModelForm): def __init__(self, *args, **kwargs): super(MyAdminForm, self).__init__(*args, **kwargs) self.fields['m2m_field'].widget = MultiSelectWidget('m2m_field', is_stacked=False) class Meta: model = MyModel class MyAdmin(admin.ModelAdmin): form = MyAdminForm </code></pre> <p>which renders correctly.</p> <p>But I am not sure how to implement this <code>some_js_to_load_ajax_options.js</code> ajax part. Should I write my own jQuery snippet or modify <code>SelectFilter2</code> which comes with <code>admin/media/js</code>? Anybody been there before?</p> <p><strong>edit:</strong> Although not related to the core of the question, as I only want to override the field's widget, the shorter way is to use <code>formfield_overrides</code>:</p> <pre><code>class MultiSelectWidget(FilteredSelectMultiple): # as above class MyAdmin(admin.ModelAdmin): formfield_overrides = { models.ManyToManyField: {'widget': MultiSelectWidget}, } </code></pre>
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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.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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