How to use the pin.models.Post function in pin

def home(request):
    timestamp = get_request_timestamp(request)

    if timestamp == 0:
        latest_items = Post.accepted.filter(show_in_default=1)\
            .order_by('-is_ads', '-timestamp')[:20]
    else:
        latest_items = Post.accepted.filter(show_in_default=1)\
            .extra(where=['timestamp<%s'], params=[timestamp])\
            .order_by('-timestamp')[:20]

    if request.is_ajax():
        if latest_items.exists():
            return render(request,
                          'pin/_items.html',
                          {'latest_items': latest_items})
        else:
            return HttpResponse(0)
    else:
        return render(request, 'pin/home.html', {'latest_items': latest_items})

def delete_all_user_posts(self, request, queryset):
        for obj in queryset:
            user = obj.user
            user.is_active = False
            user.save()
            Post.objects.filter(user=obj.user).delete()
            Comments.objects.filter(user=obj.user).delete()

comment = models.ForeignKey(Comments)
    user = models.ForeignKey(User, related_name='comment_like_user')
    score = models.IntegerField(default=0, blank=True)

class Report(models.Model):
    user = models.ForeignKey(User, related_name='report_user')
    post = models.ForeignKey(Post, related_name='report_post')
    
    class Meta:
        unique_together = (("post", "user"),)


post_save.connect(Stream.add_post, sender=Post)
post_save.connect(Likes.user_like_post, sender=Likes)
#post_delete.connect(Likes.user_unlike_post, sender=Likes)
post_save.connect(Post.change_tag_slug, sender=Tag)
post_save.connect(Notif.add_comment, sender=Comments)

def get_absolute_url(self):
        return ('pin-item', [str(self.object_pk_id)])

    def admin_link(self):        
        return '<a href="%s">مشاهده</a>' % (self.get_absolute_url())

    admin_link.allow_tags = True

class Comments_score(models.Model):
    comment = models.ForeignKey(Comments)
    user = models.ForeignKey(User, related_name='comment_like_user')
    score = models.IntegerField(default=0, blank=True)

class Report(models.Model):
    user = models.ForeignKey(User, related_name='report_user')
    post = models.ForeignKey(Post, related_name='report_post')
    
    class Meta:
        unique_together = (("post", "user"),)


post_save.connect(Stream.add_post, sender=Post)
post_save.connect(Likes.user_like_post, sender=Likes)
#post_delete.connect(Likes.user_unlike_post, sender=Likes)
post_save.connect(Post.change_tag_slug, sender=Tag)
post_save.connect(Notif.add_comment, sender=Comments)

admin_link.allow_tags = True

class Comments_score(models.Model):
    comment = models.ForeignKey(Comments)
    user = models.ForeignKey(User, related_name='comment_like_user')
    score = models.IntegerField(default=0, blank=True)

class Report(models.Model):
    user = models.ForeignKey(User, related_name='report_user')
    post = models.ForeignKey(Post, related_name='report_post')
    
    class Meta:
        unique_together = (("post", "user"),)


post_save.connect(Stream.add_post, sender=Post)
post_save.connect(Likes.user_like_post, sender=Likes)
#post_delete.connect(Likes.user_unlike_post, sender=Likes)
post_save.connect(Post.change_tag_slug, sender=Tag)
post_save.connect(Notif.add_comment, sender=Comments)

user.is_active = False
            user.save()
            obj.delete()

    delete_and_deactive_user.short_description = 'حذف و غیر فعال کردن کاربر'

    def delete_all_user_comments(self, request, queryset):
        for obj in queryset:
            user = obj.user
            user.is_active = False
            user.save()
            Comments.objects.filter(user=obj.user).delete()

    delete_all_user_comments.short_description = 'حذف تمام کامنت های این کاربر و غیر فعال کردن کاربر'

admin.site.register(Post, PinAdmin)
admin.site.register(Category, CategoryAdmin)
admin.site.register(Profile, ProfileAdmin)
admin.site.register(App_data, AppAdmin)
admin.site.register(Comments, CommentsAdmin)