I have a Category and SubCategory model. Each SubCategory belongs to a
Category via a Foreign Key. (So each Category can have many
SubCategories.)

I have several places throughout my app where I show the list of
SubCategories as part of some ModelForm. It renders like so:

<select multiple="multiple">
<option>subcategory 1</option>
<option>subcategory 2</option>
<option>subcategory 3</option>
...
</select>


Which is dandy, but I would like to customize this a bit by showing
Categories as well in an <optgroup>, like so:

<select multiple="multiple">
<optgroup label="Category 1">
  <option>subcategory 1</option>
  <option>subcategory 2</option>
  <option>subcategory 3</option>
</optgroup>
...
</select>

Any ideas on how I can make that happen? Thanks in advance for any
help.
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