Python MongoDB – find_one_and_update Query
The function find_one_and_update() actually finds and updates a MongoDB document. Though default-wise this function returns the document in original form and to return the updated document return_document have to be implemented in the code.
Syntax: coll.find_one_and_update(filter, update, options)
Parameters:
- col- collection in MongoDB
- filter- criteria to find the document which needs to be updated
- update- The operations which need to be implemented for updating the document
- options- projection or upsert can be used here
- projection- a mapping which informs about which fields are included and excluded, it is 1/TRUE for including a field and 0/FALSE for excluding
- upsert- for inserting a new document if no file is found with the mentioned criteria upsert is TRUE
Example 1:
Sample Database:
from pymongo import MongoClient from pymongo import ReturnDocument # Create a pymongo client client = MongoClient('localhost', 27017) # Get the database instance db = client['GFG'] # Create a collection doc = db['Student'] print(doc.find_one_and_update({'name':"Raju"}, { '$set': { "Branch" : 'ECE'} }, return_document = ReturnDocument.AFTER)) |
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filter_none
Output:
{‘_id’: 5, ‘name’: ‘Raju’, ‘Roll No’: ‘1005’, ‘Branch’: ‘ECE’}
Example 2:
from pymongo import MongoClient from pymongo import ReturnDocument # Create a pymongo client client = MongoClient('localhost', 27017) # Get the database instance db = client['GFG'] # Create a collection doc = db['Student'] print(# Increasing marks of Ravi by 10 doc.find_one_and_update({'name': "Raju"}, { '$set': { "Branch" : 'CSE'} }, projection = { "name" : 1, "Branch" : 1 }, return_document = ReturnDocument.AFTER)) |
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filter_none
Output:
{'_id': 5, 'name': 'Raju', 'Branch': 'CSE'}
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