Tom Slabbaert questions

Tom Slabbaert answers

• Merge aggregation in mongodb
• Why am I getting a AggregationCursor as a result and not an average?
• E11000 (DuplicateKey) error when using a partial multikey unique index
• How to update a property of the last object of a list in mongo
• 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