How can I remove N documents in PyMongo?

Question

I'm trying to collection.remove({}) N documents using PyMongo. On mongodb this is done like this, what's the PyMongo equivalent?

Thanks

Answer 1

要删除集合中的N个文档，您可以执行

1. 对该集合进行bulk_write次DeleteOne次操作。 e.g。

   In [1]: from pymongo import MongoClient
           from pymongo.operations import DeleteOne
   
   
           client = MongoClient()
           db = client.test
           N = 2 
   
           result = db.test.bulk_write([DeleteOne({})] * N)
   
   In [2]: print(result.deleted_count)
   2
   

2. delete_many使用之前find的所有ID的过滤器。 e.g。

   def delete_n(collection, n):
       ndoc = collection.find({}, ('_id',), limit=n)
       selector = {'_id': {'$in': [doc['_id'] for doc in ndoc]}}
       return collection.delete_many(selector)
   
   result = delete_n(db.test, 2)
   print(result.deleted_count)