Python 段塞发生器don'；t为tablecontent生成slug

我不知道为什么slug生成器没有为我表中的项目生成slug。如果我使用.save（）命令保存数据，效果会非常好。但它不适用于不使用django相关命令的管道。 我使用Postgresql数据库

型号：

    class WhiskyContent(models.Model):
        products = models.CharField(max_length=250)
        price = models.FloatField(default=20)
        date = models.CharField(max_length=250)
        picture = models.CharField(max_length=250)
        site = models.CharField(max_length=250)
        product_link = models.CharField(max_length=250)
        shipping = models.CharField(max_length=250)
        slug = models.SlugField(max_length=250, unique=True, blank=True, null=True)

        def get_absolute_url(self):
            return "/products/{slug}/".format(slug=self.slug)

        def __str__(self):
            return self.products

        objects = models.Manager


    def product_pre_save_receiver(sender, instance, *args, **kwargs):
        if not instance.slug:
            instance.slug = unique_slug_generator(instance)


    pre_save.connect(product_pre_save_receiver, sender=WhiskyContent)

进入数据库的管道：

import psycopg2
import sys
import logging

class Frankbrauer360Pipeline(object):


def __init__(self):
    self.create_connection()

def create_connection(self,):
    hostname = 'localhost'
    username = 'postgres'
    password = 'Whisky#123!'
    database = 'Items'
    x = 1
    try:
        if (x == 1):
            self.connection = psycopg2.connect(host=hostname, user=username, password=password, dbname=database)

    except psycopg2.DatabaseError as e:
        logging.error(e)
        sys.exit()
    finally:
        logging.info('Connection opened successfully.')

def process_item(self, item, spider):
    cursor = self.connection.cursor()
    cursor.execute('''
            insert into homepage_whiskycontent(products, price, picture, site, product_link, shipping, date)
            values (%s, %s, %s, %s, %s, %s, %s);
            ''', [
                    item['products'],
                    item['price'],
                    item['picture'],
                    item['site'],
                    item['product_link'],
                    item['shipping'],
                    item['date'],
             #      item["slug"],
    ])
    self.connection.commit()
    return item

def close_spider(self, spider):
    self.connection.close()

段塞发生器：

import random
import string
from django.utils.text import slugify


def random_string_generator(size=10, chars=string.ascii_lowercase + string.digits):
    return ''.join(random.choice(chars) for _ in range(size))


def unique_slug_generator(instance, new_slug=None): 

if new_slug is not None:
    slug = new_slug
else:
    slug = slugify(instance.products)

Klass = instance.__class__
qs_exists = Klass.objects.filter(slug=slug).exists()
if qs_exists:
    new_slug = "{slug}-{randstr}".format(
                slug=slug,
                randstr=random_string_generator(size=4)
            )
    return unique_slug_generator(instance, new_slug=new_slug)
return slug

---

我希望有人能帮助我：）

如果在不使用Django的情况下插入数据，您为什么希望这样做？我遇到了一个问题，无法在管道中导入模型。但现在我将scrapy实现到Django，效果非常好：）