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# project_name/app_name/models.py

from django.db import models

class Category(models.Model):
  name = models.CharField(max_length=128, unique=True)
  views = models.IntegerField(default=0)
  likes = models.IntegerField(default=0)

  def __str__(self):
    return self.name
  # changing the pluralization and adding an ordering
  class Meta:
    ordering = ["name"]
    verbose_name_plural = "categories"
  
  # A virtual attribute
  def popular(self):
    return self.likes >= 100
  popular.short_description = 'Top Category?'

class Page(models.Model):
  category = models.ForeignKey(Category)
  title = models.CharField(max_length=128)
  url = models.URLField()
  views = models.IntegerField(default=0)

  def __str__(self):
    return '%s id: %s' % (self.title, self.id)

# project_name/app_name/models.py

from django.contrib import admin
from rango.models import Category, Page

  # class to customize page view in /admin (note PageAdmin in arguments on line 15)
class PageAdmin(admin.ModelAdmin):
  # controls how index of all pages are shown
  list_display = ('title', 'category', 'views')
  list_filter = ('category')
  # controls how view of each page is shown
  fieldsets = [
    ('Category', {'fields': ['category']}),
    ('Page information', {'fields': ['title', 'views'], 'classes': ['collapse']}),
  ]

# register models to make them accessible via the /admin interface
admin.site.register(Category)
admin.site.register(Page, PageAdmin)