django-ram/ram/consist/admin.py

from django.contrib import admin
from adminsortable2.admin import SortableAdminBase, SortableInlineAdminMixin

from consist.models import Consist, ConsistItem


class ConsistItemInline(SortableInlineAdminMixin, admin.TabularInline):
    model = ConsistItem
    min_num = 1
    extra = 0
    autocomplete_fields = ("rolling_stock",)
    readonly_fields = ("preview", "address", "type", "company", "era")


@admin.register(Consist)
class ConsistAdmin(SortableAdminBase, admin.ModelAdmin):
    inlines = (ConsistItemInline,)
    readonly_fields = (
        "creation_time",
        "updated_time",
    )
    list_display = ("identifier", "company", "era")
    list_filter = list_display
    search_fields = list_display
    save_as = True

    fieldsets = (
        (
            None,
            {
                "fields": (
                    "identifier",
                    "consist_address",
                    "company",
                    "era",
                    "image",
                    "notes",
                    "tags",
                )
            },
        ),
        (
            "Audit",
            {
                "classes": ("collapse",),
                "fields": (
                    "creation_time",
                    "updated_time",
                ),
            },
        ),
    )