admin.py

class RealtyObjectAdmin(admin.ModelAdmin):

    list_display = ['realty_complex',
                    'square', 'rent_available',
                    'floor', 'flat_number', 'rent_price_eur']
    search_fields = ['realty_complex', ]
    autocomplete_fields = ('realty_complex', )
    fieldsets = (
        (None, {
            'fields': (('realty_complex', 'created_at', 'photo', ),
                       ('site_url', ),
                       ('rooms_count', 'floor', 'flat_number', 'square',),
                       ('rent_price_eur', 'rent_available'),
                       )
        }),
    )

    admin_fieldsets = (
        (None, {
            'fields': (('realty_complex', 'created_at', 'photo',),
                       ('agency', 'site_url',),
                       ('rooms_count', 'floor', 'flat_number', 'square',),
                       ('rent_price_eur', 'rent_available'),
                       )
        }),
    )

    def save_model(self, request, obj, form, change):
        if form.is_valid():
            if not obj.user:
                obj.user = request.user
            if not request.user.is_superuser \
                    and not request.user.profile.access_level == 'superuser' \
                    and not request.user.profile.access_level == 'admin':
                if request.user.profile.access_level == 'agent':
                    obj.agency = RealtyAgency.objects.filter(agents__user=request.user).last()
            obj.save()

    def preprocess_list_display(self, request):
        if 'user' not in self.list_display:
            self.list_display.insert(self.list_display.__len__(), 'user')
        if 'agency' not in self.list_display:
            self.list_display.insert(self.list_display.__len__(), 'agency')
        if not request.user.is_superuser \
                and not request.user.profile.access_level == 'superuser' \
                and not request.user.profile.access_level == 'admin':
            if 'user' in self.list_display:
                self.list_display.remove('user')
            if 'agency' in self.list_display:
                self.list_display.remove('agency')

    def get_fieldsets(self, request, obj=None):
        if not request.user.is_superuser \
                and not request.user.profile.access_level == 'superuser' \
                and not request.user.profile.access_level == 'admin':
            return self.fieldsets or tuple()
        return self.admin_fieldsets

    def preprocess_search_fields(self, request):
        if 'user__username' not in self.search_fields:
            self.search_fields.insert(self.search_fields.__len__(), 'user__username')
        if not request.user.is_superuser:
            if 'user__username' in self.search_fields:
                self.search_fields.remove('user__username')

    def changelist_view(self, request, extra_context=None):
        self.preprocess_list_display(request)
        self.preprocess_search_fields(request)
        return super(RealtyObjectAdmin, self).changelist_view(request)

    def has_change_permission(self, request, obj=None):
        if not obj or request.user.is_superuser or request.user.profile.access_level == 'superuser':
            return True
        return request.user == obj.user

    def get_queryset(self, request):
        if request.user.is_superuser or request.user.profile.access_level == 'superuser':
            return super(RealtyObjectAdmin, self).get_queryset(request)
        else:
            qs = super(RealtyObjectAdmin, self).get_queryset(request)
            return qs.filter(user=request.user)