tildetown-admin/ttadmin/help/admin.py

from django.contrib import admin
from django.forms import ModelForm
from .models import Ticket, Note


class ImmutableNoteInline(admin.TabularInline):
    model = Note
    extra = 1
    max_num = 0
    fields = ('author', 'created', 'body')
    readonly_fields = ('author', 'created', 'body')
    can_delete = False
    ordering = ('created',)


class NewNoteInline(admin.StackedInline):
    model = Note
    extra = 0
    fields = ('body',)

    def get_queryset(self, request):
        queryset = super().get_queryset(request)
        return queryset.none()


@admin.register(Ticket)
class TicketAdmin(admin.ModelAdmin):
    inlines = [ImmutableNoteInline, NewNoteInline]
    readonly_fields = ('submitted', 'issue_type')
    list_display = ('submitted', 'issue_status', 'assigned', 'issue_type', 'name', 'email',)
    list_filter = ('issue_status', 'issue_type', 'assigned')
    fields = ('submitted', 'name', 'email', 'assigned', 'issue_status', 'issue_type', 'issue_text')

    def save_related(self, request, form, formsets, change):
        # THIS IS EXTREMELY BOOTLEG AND MAY BREAK IF MORE INLINES ARE ADDED TO THIS ADMIN.
        for formset in formsets:
            if len(formset.forms) == 1:
                # It's probably the add new note form (i hope).
                note_form = formset.forms[0]
                note_form.instance.author = request.user
                note_form.instance.save()
                note_form.save(commit=False)
                note_form.save_m2m()
        return super().save_related(request, form, formsets, change)