Mongodb counter increment.

app.py

from flask import Flask,Response

app = Flask(__name__)

@app.route('/')
def hello():
    return "Hello World!"

@app.route('/<int:recipe_id>',methods=['GET'])
def home(recipe_id):
    # Don't import stuff here, just for demo
    import db

    posts = db.posts
    # increase counter
    posts.update({'_id': recipe_id}, {'$inc': {'counter': 1}})
    
    print('Flask says: ', posts.find_one({'_id': recipe_id }))
    
    return Response(status=200)

# run the server
if __name__ == '__main__':
    app.run(debug=True)

db.py

# Database setup stuff
import pymongo
from pymongo import MongoClient
client = MongoClient()
db = client.test_database
collection = db.test_collection
posts = db.posts

# Count should have been incremented by initial shell session
print('Db script: ', posts.find_one({'_id': 1 }))

shell.py

# Database setup stuff
>>> import pymongo
>>> from pymongo import MongoClient
>>> client = MongoClient
>>> client = MongoClient()
>>> db = client.test_database
>>> collection = db.test_collection

# Create something and confirm ID
>>> post = {'_id':1, 'text':'TEST', 'counter' : 1 }
>>> posts = db.posts
>>> post_id = posts.insert_one(post).inserted_id
>>> post_id
1

# Search it, second line here returns blank cause nothing with id 2 exists.
>>> posts.find_one({'_id': 1 })
{'_id': 1, 'text': 'TEST', 'counter': 1}
>>> posts.find_one({'_id': 2 })

# Update the counter
>>> posts.update({'_id': 1}, {'$inc': {'counter': 1}})
{'n': 1, 'nModified': 1, 'ok': 1.0, 'updatedExisting': True}

# Confirm this worked, counter should be 2
>>> posts.find_one({'_id': 1 })
{'_id': 1, 'text': 'TEST', 'counter': 2}