Support sparse arrays

I can’t seem to create an array with null or undefined values without it getting filtered out.

const Item = new SimpleSchema({
	myArray: {
		type: Object,
		optional: true,
		blackbox: true
	},
});

const arr = [];
arr[1] = 100;

Items.attachSchema(Items);

Items.update({_id: itemId}, { $set: {myArray: arr} });

The update is creates an array sometimes like this [null] and sometimes just [].

I’m using blackbox because I couldn’t find how to create validation for an array with null or undefined values, like [,100] or [null, 100].

[aldeed]

@santiagopuentep Maybe but it’s hard to say. Because of the support for modifier objects, every value is run through a mongo-object package, which treats undefined in a particular way, different from null. It will take some work to step through and see if this is fixable.

[aldeed]

It will never be valid right now because it doesn’t understand sparse arrays and arrays cannot be blackboxed. You’d have to use _.compact to remove the null values before validating, or if you need them, then skip validation and skip cleaning whenever you insert/update that array.