this field is intentionally 2 characters long 16080 this field is intentionally 2 characters long 16080
from django.contrib.auth.models import User
from django.db import models


class Band(models.Model):
    name = models.CharField(max_length=100)
    bio = models.TextField()
    sign_date = models.DateField()

    class Meta:
        ordering = ("name",)

    def __str__(self):
        return self.name


class Song(models.Model):
    name = models.CharField(max_length=100)
    band = models.ForeignKey(Band, models.CASCADE)
    featuring = models.ManyToManyField(Band, related_name="featured")

    def __str__(self):
        return self.name


class Concert(models.Model):
    main_band = models.ForeignKey(Band, models.CASCADE, related_name="main_concerts")
    opening_band = models.ForeignKey(
        Band, models.CASCADE, related_name="opening_concerts", blank=True
    )
    day = models.CharField(max_length=3, choices=((1, "Fri"), (2, "Sat")))
    transport = models.CharField(
        max_length=100, choices=((1, "Plane"), (2, "Train"), (3, "Bus")), blank=True
    )


class ValidationTestModel(models.Model):
    name = models.CharField(max_length=100)
    slug = models.SlugField()
    users = models.ManyToManyField(User)
    state = models.CharField(
        max_length=2, choices=(("CO", "Colorado"), ("WA", "Washington"))
    )
    is_active = models.BooleanField(default=False)
    pub_date = models.DateTimeField()
    band = models.ForeignKey(Band, models.CASCADE)
    best_friend = models.OneToOneField(User, models.CASCADE, related_name="best_friend")
    
    no = models.IntegerField(verbose_name="Number", blank=True, null=True)

    def decade_published_in(self):
        return self.pub_date.strftime("%Y")[:3] + "0's"


class ValidationTestInlineModel(models.Model):
    parent = models.ForeignKey(ValidationTestModel, models.CASCADE)