id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
20113	Documentation on _ptr and _ptr_id use in multi-table inheritance	anonymous	nobody	"The documentation on ""Multi-table inheritance"" does not mention the naming of the (generated) primary / foreign key field of the inheriting table (which becomes place_ptr_id in the Place / Restaurant example). 

If I use instance data from that model in a template, and want to render the fields myself, I need that name, as described in ""Using the formset in the template"":
{{{
<form method=""post"" action="""">
    {{ formset.management_form }}
    {% for form in formset %}
        {{ form.place_ptr }}
        <ul>
            <li>{{ ... }}</li>
        </ul>
    {% endfor %}
</form>
}}}
Confusingly, the name which should be used here is ""place_ptr"", not ""place_ptr_id"", which it is in the database (using ""place_ptr_id"" in the template gives a MultiValueDictKeyError). Since this is not documented (or I haven't found it, though I did search!), I suggest adding something to the ""Multi-table inheritance"" documentation which explains how the auto-generated field can be used in templates as ""place_ptr"".
"	Cleanup/optimization	closed	Documentation	1.5	Normal	duplicate			Unreviewed	0	0	0	0	0	0