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I am trying to update multiple documents on mongo db. which is better update method with multi = true or updateMany method? and what is the difference between them?
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The updateMany() method updates all the documents in MongoDB collections that match the given query. When you update your document, the value of the _id field remains unchanged. This method can also add new fields in the document.
In MongoDB, the 'update ()' and 'save ()' methods are used to update the document into a collection. The 'update ()' method is used to update the values present in the existing document whereas 'save ()' method replaces the entire existing document with the new document which is passed in the 'save ()' method.
To update multiple documents in a collection, set the multi option to true. multi is optional. If set to true, updates multiple documents that meet the query criteria. If set to false, updates one document.
To expand on Blakes Seven's answer, all the updateOne method does is simply set the multi option to false as seen here (github).
And in turn all the updateMany method does is set the multi opion to true as seen here (github).
So there is no "better" method to call, just pick whichever you feel suits the situation.
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