custom templates in FilterSpec

[Stefano Apostolico]

django 1.4 allow an easier customization of FilterSpec but force all to the same presentation, should be useful customize the template used by the filter.
The patch simply allow to specify the template to use into FilterSpec or use the default one otherwise, moreover put the FilterSpec into the context to be available into temlplate

def admin_list_filter(cl, spec):
    if hasattr(spec, 'template') and spec.template:
        t = get_template(spec.template)
    else:
        t = get_template('admin/filter.html')
    ctx = Context({'title': spec.title, 'choices' : list(spec.choices(cl)), 'spec': spec})
    return t.render(ctx)

[Stefano Apostolico]

patch with docs and tests also renamed template attribute as 'template_name'

[Julien Phalip]

I think that 'template' would be better than 'template_name' and more consistent with other similar attributes in the admin (e.g. StackedInline.template or ModelAdmin.change_form_template). Also, a custom template file actually needs to be included in the patch.

[Julien Phalip]

The latest patch uses 'template' instead of 'template_name', cleans up the implementation a bit and adds a custom template file to the tests.

[Jannis Leidel]

In [17483]:

Fixed #17515 -- Added ability to override the template of custom admin FilterSpec classes. Thanks, saxix and Julien Phalip.