I use scarpy to crawl data and save it to cloud hosting mLab successfully with MongoDB.

My collection name is recently and data's count is 5.

I want to crawl data again and update my collection recently, so i try to drop the collection and then insert.

Here is my code pipelines.py:

from pymongo import MongoClient
from scrapy.conf import settings

class MongoDBPipeline(object):

    def __init__(self):
        connection = MongoClient(
            settings['MONGODB_SERVER'],
            settings['MONGODB_PORT'])
        db = connection[settings['MONGODB_DB']]
        # here is my collection name recently setting
        self.collection = db[settings['MONGODB_COLLECTION']]

    def process_item(self, item, spider):
        # try to drop my collection recently
        self.collection.drop()
        self.collection.insert(dict(item))
        return item

But when I run my spider, I see my collection recently count is 10 (It should be 5 that is what I want)

I looking for some code that how to drop collection. It's just say db.[collection Name].drop()

But its no working in my case when i try self.collection.drop() before self.collection.insert(dict(item))

Anyone can give me some suggestions what is wrong with my code ?

That would be appreciated. Thanks in advance.