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django-related-select

The django-related-select module is designed to make ajax-powered select fields easy using Django forms.

Installation

Install using pip:

pip install django-related-select

Add to INSTALLED_APPS

 INSTALLED_APPS = [
     ...
     'related_select',
     ...
 ]

Usage

Form

class MyForm(forms.Form):
    foo = forms.ChoiceField(choices=[('foo', 'foo')])
    bar = RelatedChoiceField(related_dependent='foo', related_url=reverse_lazy('my-related-select-view'))
    
    # optional if you're using bound forms, for error handling or pre-filling of fields
    # otherwise any RelatedChoiceFields will lose their contents
    def __init__(self, **kwargs):
        super(MyForm, self).__init__(**kwargs)
        if self.is_bound:
            self.fields['bar'].init_bound_field(self.data.get('foo'))

View

class MyRelatedSelectView(RelatedSelectView):
    @staticmethod
    def filter(value, **kwargs):
        return SomeModel.objects.filter(related_model_id=value)
    
    @staticmethod
    def to_value(obj):
        # uses obj.id by default, but can return any valid value
        return obj.uuid
    
    @staticmethod
    def to_text(obj):
        # uses str(obj) by default, but can return any string
        return '({}) {}'.format(obj.id, obj.name)

Template

<html>
...
{{ form.bar }}
...
<script src='{% static "django-related-select.js" %}'></script>
...
</html>