Answers for "mongodb update field if only exists"

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mongodb add or update document fields only if they don't exist

db.foo.update({'field': {$exists : false}}, {$set: {'field': ''}})
// for multiple update do this
db.foo.update({'field': {$exists : false}}, {$set: {'field': ''}}, false, true)

Posted by: Guest on August-03-2021

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