What is the v field in Mongoose

Question

I m using Mongoose version 3 with MongoDB version 2 2  I ve noticed a   v field has started appearing in my MongoDB documents  Is it something to do with versioning  How is it used

User · Accepted Answer

From here      The versionKey is a property set on each document when first created   by Mongoose  This keys value contains the internal revision of the   document  The name of this document property is configurable  The   default is   v       If this conflicts with your application you can configure as such    new Schema         versionKey    somethingElse

User · Answer

For remove in NestJS need to add option to Shema   decorator  Schema   versionKey  false

User · Answer

It is the version key It gets updated whenever a new update is made  I personally don t like to disable it   Read this solution if you want to know more  1   Mongoose versioning  when is it safe to disable it

User · Answer

We can use versionKey  false in Schema definition    use strict    const mongoose   require  mongoose     export class Account extends mongoose Schema        constructor manager             var trans                 tran date  Date              particulars  String              debit  Number              credit  Number              balance  Number                    super               account number  Number              account name  String              ifsc code  String              password  String              currency  String              balance  Number              beneficiaries  Array              transaction   trans                           versionKey  false    set to false then it wont create in mongodb                      this pre  remove   function next                manager                  getModel BENEFICIARY MODEL                   remove                        id                             in  this beneficiaries                                                           exec                next

User · Answer

Well  I can t see Tony s solution   so I have to handle it myself       If you don t need version key  you can just   var UserSchema   new mongoose Schema       nickname  String      reg time   type  Date  default  Date now           versionKey  false    You should be aware of the outcome after set to false       Setting the versionKey to false means the document is no longer versioned    This is problematic if the document contains an array of subdocuments  One of the subdocuments could be deleted  reducing the size of the array  Later on  another operation could access the subdocument in the array at it s original position    Since the array is now smaller  it may accidentally access the wrong subdocument in the array   The versionKey solves this by associating the document with the a versionKey  used by mongoose internally to make sure it accesses the right collection version   More information can be found at  http   aaronheckmann blogspot com 2012 06 mongoose-v3-part-1-versioning html

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