Inserting field with `undefined` value inserts `null` instead of `undefined`

For example:

collection.insert({ name: undefined })

inserts { name: {} } and not { name: undefined }. I’m using monk 3.0.4.

The mongo shell inserts { name: undefined } for same insert command.

[ceoworks]

it seems like mongo has connection option ignoreUndefined, which could solve this issue. https://mongodb.github.io/node-mongodb-native/2.1/reference/connecting/connection-settings/

[mathieudutour]

hum maybe something like:

module.exports = function (context) {
  return function (next) {
    return function (args, method) {
      if (!args.data) {
        return next(args, method)
      }

      if (typeof args.data !== 'object') {
        return next(args, method)
      }

      const dataWithoutUndefined = Object.keys(args.data).reduce((prev, k) => {
        if (typeof args.data[k] !== 'undefined') {
          prev[k] = args.data[k]
        }
        return prev
      }, {})

      args.data = dataWithoutUndefined
      return next(args, method)
    }
  }
}