mongodb - Checking nested property that can be null -


i've following data in collection:

{ colour: { r: 0, g: 0, b: 0 }}, { colour: null },

how can find documents have colour == null or color.r between values?

i've tried 

.find({ where: { $or: [{colour: null}, {"colour.r": {$gt: 0, $lt: 100}}]}})

but of course gives me cannot read property 'r' of null null rows.

use $where if there no other way express query

db.test.find({$or: [{"colour": null}, {"colour.r": {$gt: 0, $lt: 100}}]})

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