django admin model

djangoadminmodel.py

from django.contrib.auth.models import User
from django.db import models
from django.utils import timezone

class Catagory(models.Model):
    title = models.CharField(max_length=100)

    def __str__(self):
        return self.title

class MyPost(models.Model):
    options = (('draft', 'Draft'),('published','Published'),)
    title = models.CharField(max_length=100)
    catagory = models.ForeignKey(Catagory,on_delete=models.PROTECT,default=1)
    detail = models.TextField(null=True)
    slug = models.SlugField(max_length=200,unique_for_date='publish',null=True)
    author = models.ForeignKey(User, on_delete=models.CASCADE,related_name='app_mypost',null=True)
    publish = models.DateField(default=timezone.now)
    content = models.TextField(null=True)
    status = models.CharField(max_length=10,choices=options, default='draft')

    class Meta :
        verbose_name = ('Post')
        verbose_name_plural = ('Posts')


    def __str__(self):
        return self.title