Cannot hide "Save and add another" button in Django Admin

Question

I would like to hide all the "Save" buttons in Django's Admin's Change Form, for a specific model, when certain conditions are met. Therefore, I override the changeform_view method in the relevant ModelAdmin, like so:

def changeform_view(self, request, object_id=None, form_url='', extra_context=None):
    extra_context = extra_context or {}
    obj = collection_management_MammalianLine.objects.get(pk=object_id)
    if obj:
        if not (request.user.is_superuser or request.user.groups.filter(name='Lab manager').exists() or request.user == obj.created_by):
            extra_context['show_save'] = False
            extra_context['show_save_and_continue'] = False
            extra_context['show_save_and_add_another'] = False
        else:
            pass
    else:
        pass
    return super(MammalianLinePage, self).changeform_view(request, object_id, extra_context=extra_context)

With this code, I can successfully hide the "Save" and "Save and continue" buttons, but not the "Save and add another" one. I can see that submit_line.html contains the following three lines:

{% if show_save %}<input type="submit" value="{% trans 'Save' %}" class="default" name="_save" />{% endif %}
{% if show_save_and_add_another %}<input type="submit" value="{% trans 'Save and add another' %}" name="_addanother" />{% endif %}
{% if show_save_and_continue %}<input type="submit" value="{% trans 'Save and continue editing' %}" name="_continue" />{% endif %}

My question is: why can I hide the "Save" and "Save and continue" buttons, but not the "Save and add another" one? Even though the relevant templatetag (show_save_and_continue) is in the template.

Answer 1

You may override render_change_form method in ModelAdmin subclass. In this method obj is available as argument and you can check certain conditions.

class OrderAdmin(admin.ModelAdmin):

    def render_change_form(self, request, context, add=False, change=False, form_url='', obj=None):
        context.update({
            'show_save': False,
            'show_save_and_continue': False,
            'show_delete': False
        })
        return super().render_change_form(request, context, add, change, form_url, obj)