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db.collection.update( criteria, objNew, upsert, multi )
Refer to update
I have seen the following usage of {} inside update as a criteria.
collection.update({}, {$push : { x : 1}})
What is the meaning of {} here? Does it mean no criteria?
The first argument to
updatespecifies criteria used to find documents to be updated. Setting the first argument to{}, will match against every document in the collection. By default, only the first match will be updated. To update all matched documents, setmultito true.