from django.contrib import admin

from django.db import models

class Band(models.Model):

    name = models.CharField(max_length=100)

    bio = models.TextField()

    rank = models.IntegerField()

    class Meta:

        ordering = ("name",)

class Song(models.Model):

    band = models.ForeignKey(Band, models.CASCADE)

    name = models.CharField(max_length=100)

    duration = models.IntegerField()

    other_interpreters = models.ManyToManyField(Band, related_name="covers")

    class Meta:

        ordering = ("name",)

class SongInlineDefaultOrdering(admin.StackedInline):

    model = Song

class SongInlineNewOrdering(admin.StackedInline):

    model = Song

    ordering = ("duration",)

class DynOrderingBandAdmin(admin.ModelAdmin):

    def get_ordering(self, request):

        if request.user.is_superuser:

            return ["rank"]

        else:

            return ["name"]