I'm able to insert (lame) static text onto the change form admin page, but I'd really like it to use the context of the current object being edited!

For instance, I want to format on the MyObject change form a URL to include the ID from a ForeignKey connected object (obj) as a link.

My admin objects:

class MyObjectChangeForm(forms.ModelForm):
    class Meta:
        model = MyObject
        fields = ('field1', 'obj',)

class MyObjectAdmin(admin.ModelAdmin):
    form = MyObjectChangeForm
    list_display = ('field1', 'obj')
    def render_change_form(self, request, context, *args, **kwargs):
        self.change_form_template = 'admin/my_change_form.html'
        extra = {'lame_static_text': "something static",}
        context.update(extra)
        return super(MyObjectAdmin, self).render_change_form(request,
            context, *args, **kwargs)

My template templates/admin/my_change_form.html:

{% extends "admin/change_form.html" %}

{% block form_top %}
    {{ lame_static_text }}
    <a href="http://example.com/abc/{{ adminform.data.obj.id }}?"/>View Website</a>
{% endblock %}

The {{adminform.data.obj.id}} call obviously doesn't work, but I'd like something along those lines.

How do I insert dynamic context from the current object into the admin change form?

Add your extra context in change_view

class MyObjectAdmin(admin.ModelAdmin):

    # A template for a very customized change view:
    change_form_template = 'admin/my_change_form.html'

    def get_dynamic_info(self):
        # ...
        pass

    def change_view(self, request, object_id, form_url='', extra_context=None):
        extra_context = extra_context or {}
        extra_context['osm_data'] = self.get_dynamic_info()
        return super(MyObjectAdmin, self).change_view(
            request, object_id, form_url, extra_context=extra_context,
        )