Trigger in pymongo - mongodb

Question

My Requirement is as follows:
In below table code if records gets inserted into "col" I should do some manipulations to "col2" table, How to achieve this? is my below code correct, I am trying to see what insert_change prints, but it is not printing anything
import pymongo
import logging
import Parameters,constants
class Stream:
def get_connection(self):
client = pymongo.MongoClient(
"mongodb://" + constants.USER_NAME + ":" + constants.PWD + constants.server + constants.CA_CERTIFICATES_PATH)
logging.info("Mongo DB Connection Established Sucessfully")
db = client[Parameters.STG_QC_Hub_Files]
col = db[Parameters.col7]
col2 = db[Parameters.col8]
return col,col2,db
def insert(self,col,col2,db):
try:
with db.col.watch([{'$match': {'operationType': 'insert'}}]) as stream:
print(stream)
for insert_change in stream:
print("hi")
print(insert_change)
except pymongo.errors.PyMongoError:
# The ChangeStream encountered an unrecoverable error or the
# resume attempt failed to recreate the cursor.
logging.error('...')
c=Stream()
col,col2,db=c.get_connection()
c.insert(col,col2,db)

Answer 1

The below code will print what you have inserted into the table:
import pymongo
import logging
import Parameters,constants,mongotriggers
from bson.json_util import dumps
class Stream:
def get_connection(self):
client = pymongo.MongoClient(
"mongodb://" + constants.USER_NAME + ":" + constants.PWD + constants.server + constants.CA_CERTIFICATES_PATH)
logging.info("Mongo DB Connection Established Sucessfully")
db = client[Parameters.QC_Quality_Hub]
col = db[Parameters.col7]
col2 = db[Parameters.col8]
return col,col2,db
def insert(self,col,col2,db):
try:
resume_token = None
pipeline = [{"$match": {"operationType": "insert"}}]
a = [doc for doc in col.find({})]
with col.watch(pipeline) as stream:
print(stream)
for insert_change in stream:
print(dumps(insert_change))
except pymongo.errors.PyMongoError:
logging.error("Oops")
c=Stream()
col,col2,db=c.get_connection()
c.insert(col,col2,db)