Spider运行正常并将数据保存在mongodb中，但突然开始在数据库中以及json和csv中开始保存重复值，我删除了下载图像的代码，它工作正常，但我需要图像，有人可以帮我吗？ 预先感谢。

items.py

进口沙皮

class BucketItem(scrapy.Item):
# define the fields for your item here like:
store_name = scrapy.Field()
category = scrapy.Field()
sub_category = scrapy.Field()
name = scrapy.Field()
unit = scrapy.Field()
price = scrapy.Field()
link = scrapy.Field()
image_urls = scrapy.Field()
images = scrapy.Field()
pass

pipelines.py

导入pymongo

BucketPipeline（object）类：

def __init__(self):
    self.conn = pymongo.MongoClient(
        'localhost',27017
    )
    db = self.conn['bucket']
    self.collection = db['products_tb']

def process_item(self,item,spider):
    self.collection.insert(dict(item))
    return item

spider.py

        image_url = [product.css('.productVisuals img::attr(src)').extract_first()]

        items = response.meta['items']
        items['name'] = product_name
        items['unit'] = unit
        items['price'] = product_price
        items['link'] = product_link
        items['image_urls'] = image_url
        # print(items['name'])
        yield items

[scrapy.pipelines.files]警告：文件（代码：400）：从