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## MDBW2022_CS.md

      
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                katookatoo
                / MDBW2022_CS.md
            
            
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              July 24, 2024 11:33
            
              
                MongoDB World 2022: Change Streams 
              
          
    Change Streams Docs


https://www.mongodb.com/docs/v6.0/changeStreams/
https://www.mongodb.com/docs/v6.0/reference/method/db.collection.watch/

Enabling pre-/post-images on a collection

db.runCommand( {
collMod: 'orders',
changeStreamPreAndPostImages: {enabled: true}
} )

  
## createCollection_with_validator
validator = {
    "$and": [
        {
            "geoLocation": {
                "$geoWithin": {
                    "$geometry": {
                        "type": "Polygon",
                        "coordinates": [
                            [
                                [
	validator = {
	"$and": [
	{
	"geoLocation": {
	"$geoWithin": {
	"$geometry": {
	"type": "Polygon",
	"coordinates": [
	[
	[