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In database appears we now have two kinds of non present values:
(undefined) and (null)
If I do question
if paidDateDoesNotExist == true {
question.whereKeyDoesNotExist("paidDate")
}
appears to be like prefer it returns solely undefined however no null data which is appears appropriate.
If I do question
if paidDateDoesNotExist == true {
question.whereKey("paidDate", equalTo: NSNull())
}
it returns the all undefined and null data.
So for some circumstances I must clear worth from consumer code. For instance I’ve paidDate column and I wish to clear paidDate which was set to some Date already.
in my consumer code I simply easy assign NSNull() to PFObject
like pfObject["paidDate"] = NSNull()
on this circumstances question question.whereKeyDoesNotExist("paidDate") is not going to work.
So the factor I wish to perceive – do I must assign pfObject["paidDate"] = (undefined) worth one way or the other or I simply want to make use of one other question which is makes use of NSNull() as filter.
Which is extra enjoyable after I use related question kind the admin panel, admin panel returns data that are equal to null solely ignoring undefined data. However for consumer code question:
if paidDateDoesNotExist == true {
question.whereKey("paidDate", equalTo: NSNull())
}
returns undefined data in addition to null data.
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