Tom Slabbaert questions

Tom Slabbaert answers

• Lookup stage not working after unwind operation in aggregate pipeline in mongodb
• MongoDB Query Error : '$arrayToObject requires an object keys of 'k' and 'v'. Found incorrect number of keys:1'
• mongoose updateOne function: don't update if $pull didn't work
• MongoDB aggregation problem in a span of time
• MongoDB - group documents by field value
• Pymongo how to set read_preference
• MongoDB aggregation sum values and group by property
• Perfect match between users with mongoose
• Optional parameters in MongoDB
• How to use $$NOW in $match block of aggregation pipeline