CODEWITHSUNDEEP
swiftrealm
fandro
fandro

Reputation: 4903

Realm filter empty objects in a list of Results

I want to filter a list of realm results if the id is nil or empty.

Here is a demo list of results :

{
  "id":"1"
  "name": "first"
},
{
  "id":"2"
  "name": "second"
},
{
  "id":"3"
  "name": "third"
},
{
  "id":"" //here it can be empty
  "name": ""
},
{
  "id": nil // here it can be nil
  "name": nil
}

I try to filter using the id like this but it crash :

 lazy var declarations: Results<Declaration> = {
        let realm = try! Realm()
        return self.realm.objects(Declaration.self).filter("id == " "")
    }()

Here is the model :

import RealmSwift

public final class Declaration: Object {
    dynamic var id: String = ""
    dynamic var name: String = ""

    override public static func primaryKey() -> String? {
        return "id"
    }
}

Upvotes: 1

Views: 6662

Answers (1)

TiM
TiM

Reputation: 15991

.filter("id == " "") would definitely crash because you haven't escaped those quotes. It could need .filter("id == \"\""), but just using single quotes would be better.

Since Realm queries conform to NSPredicate, copying the answer from this question, if you want to simply check if a Realm property isn't empty or nil, you should just be able to query using 

lazy var declarations: Results<Declaration> = {
    let realm = try! Realm()
    return self.realm.objects(Declaration.self).filter("id != nil AND id != ''")
}()

Upvotes: 3

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