Support modifiers that are aggregation pipelines (Mongo 4.2+)

[zenweasel]

Maybe I don't understand how validating modifiers is supposed to work related to: #424 validation does not properly handle the syntax for this:

import SimpleSchema from 'simpl-schema';

const PointsSchema = new SimpleSchema({
	pointsType: String,
	finalizedAt: Date,
	finalizedPoints: Number,
	updatedAt: Date,
	age: Number,
	updatedAt: Date
});

const rightNow = new Date();

const modifier = [
    { $set: { pointsType: "finalized" } },
    { $set: { finalizedAt: rightNow, updatedAt: rightNow } },
    { $set: { finalizedPoints: "$adjustedPoints" } }
]


PointsSchema.validate(modifier, { modifier: true });

yields this error:

errorType: 'ClientError',
error: 'validation-error',
details: [
  {
    name: 'finalizedPoints',
    value: '$adjustedPoints',
    type: 'expectedType',
    dataType: 'Number',
    message: 'Finalized points must be of type Number'
  }
]

but that syntax is correct for using the field adjustedPoints to set the value of finalizedPoints

[github-actions]

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[aldeed]

Problem number 1: This package doesn't support aggregation pipeline modifiers (modifier that is an array). Those were new in Mongo 4.2 and so far nobody has submitted a PR to add support for them. Could be quite a bit of work.

Problem number 2: $set as an update operator is different from $set as an aggregation pipeline stage. 🤷🏻 This package only supports the update modifier $set, and as far as I can tell, that one does not allow you to set value based on another field value. That's a pipeline thing.

So....

I don't think there's any bug here, and this is really a feature request to have modifier validation be aware of and support aggregation pipelines. This would be awesome, but as I said, likely a LOT of work. If anyone is interested in trying, I'm happy to help guide the way.