Loopback: Adding new field with default value, how to all documents in mongoDB is updated

Question

I am using Loopback 3 and mongoDB

I add new field with default value in json model

  {
    "name": "myModel",
    "options": {
        "mongodb": {
          "collection": "MyModel"
        }
    },
    "mixins": {
       "ShareApi": {
        "allow": ["findById"]
      }
    },
    "properties": {
      "name": {
        "type": "string",
        "description": "name"
      },
      "newField": {
        "type": "boolean",
        "default": false
      }
    }
  }

However, this just work for new documents. How to old documents are updated with newfield

You can do it with an aggregation pipeline update, $set and $ifNull. — D. SM
– D. SM, Commented Jul 13, 2020 at 2:57
@D.SM does Loopback support this migration? I want to achieve this from Loopback, not mongoDB — Vu Le Anh
– Vu Le Anh, Commented Jul 13, 2020 at 3:53
Does this answer your question? MongoDB: update every document on one field — AlexZeDim
– AlexZeDim, Commented Jul 13, 2020 at 13:31

Surbhi Rawat · Accepted Answer · 2020-07-14 05:50:48Z

0

If you want to update all documents then use updateAll query of loopback:

myModel.updateAll({}, { newField: true }, function (err, affected) { })

edited Jul 14, 2020 at 5:50

answered Jul 13, 2020 at 13:26

Surbhi Rawat

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