CODEWITHSUNDEEP
swiftcore-dataattributesnsdate
Daniel Haas
Daniel Haas

Reputation: 21

How i get CoreData Attribute when is not nil

I have a Alert with Date Picker and i save the NSDate in CoreData. So when the NSDate is safety then it´s doesn´t show the Alert anymore. So i need a func from CoreData Attribute to request the Attribute is it nil or not nil. Have anything an idea how i can do that ?

Upvotes: 1

Views: 922

Answers (2)

Philip De Vries
Philip De Vries

Reputation: 415

What you can do is add a predicate to your fetchRequest that checks whether values are nil as so:

    let fetchRequest       = NSFetchRequest(entityName: "entNameHere")
    let predicate          = NSPredicate(format: "%K != nil", "attributeNameHere")
    fetchRequest.predicate = predicate

executing the request should you get you all entries where the attribute is not nil. Conversely you could use '== nil' to find those that are nil

Upvotes: 3

Rafał Sroka
Rafał Sroka

Reputation: 40030

To check if something is nil you can do optional unwrapping. Let's assume you have a property called boDate that is an optional and can be nil

if let boDate = boDate {
    // property is not nil here
} else {
    // property is nil
}

Upvotes: -1

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