Updating path string
All options are delegated to the driver implementation. Be careful to not use an existing model instance for the update clause (this won't work and can cause weird behavior like infinite loops).
See node-mongodb-native map Reduce() documentation for more detail about options. Also, ensure that the update clause does not have an _id property, which causes Mongo to return a "Mod on _id not allowed" error.
I have seen this come up in a variety of situations, like needing to change account names in the General Ledger or needing to show something differently when reporting.
The basic code is as follows: Below is a practical example of how useful this can be.
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To apply the options to every document of your schema by default, set your schemas Create the collection for this model.Mongoose casts values and runs setters when using update.