Untitled

from django.db import modelsimport datetime# Create your models here.class Tutorial(models.Model):    title = models.CharField(maxlength=100)    slug = models.SlugField(        unique=True,         prepopulate_from=('title',),        help_text="The path for this tutorial, no file extensions."        )    pub_date = models.DateTimeField('Published Date')    created_date = models.DateTimeField(auto_now_add=True)    last_modified = models.DateTimeField('Last Modified', auto_now=True)    intro = models.TextField('Inroduction')    related_links = models.TextField('Related Links')        class Meta:        ordering = ['-pub_date', '-created_date']    def __str__(self):        return self.title    class Admin:      pass      fields = (        #(None, {'fields': ('title','slug')}),        ('Tutorial Information', {'fields': ('title','slug','pub_date','intro','related_links'), 'classes': 'collapse'}),        #(None, {'fields': ('intro','related_links')}),      )      list_display = ('title', 'pub_date', 'last_modified')      list_filter = ['last_modified']      search_fields = ['title'] class Section(models.Model):  tutorial = models.ForeignKey(Tutorial, edit_inline=True, num_in_admin=3, num_extra_on_change=1)  title = models.CharField(maxlength=100, core=True)  created_date = models.DateTimeField(auto_now_add=True, core=True)  slug = models.SlugField(        prepopulate_from=('title',),        help_text="The link directly to a section.",        core=True        )  body = models.TextField('Body', core=True)  class Meta:    unique_together = (("tutorial", "slug"),)    ordering = ['created_date']