Instantiating Realm model class crashes with missing key error

Question

When trying to instantiate my RealmDouble model I get the following error:

*** Terminating app due to uncaught exception 'RLMException', reason: 'Invalid value '0' to initialize object of type 'RealmDouble': missing key 'double_value'

class RealmDouble: Object {
    dynamic var double_value: Double = 0.00
}

RealmDouble(value: 0.0)

I have tried deleting the app from the simulator, as well as deleting the Realm file. Does anyone know how to fix this?

Can you please share the code you're using to instantiate the RealmDouble instance? — bdash

bdash bdash · Accepted Answer · 2017-06-20T02:51:25

You'd see this exception if you're passing a Double in a place where Realm expects to see either a dictionary from property names to values or an array of values, such as Realm.create(_:value:update). For instance, you'll see an error like this from the following code:

realm.create(RealmDouble.self, value: 0.0)

You should instead do:

realm.create(RealmDouble.self, value: [0.0])

Instantiating Realm model class crashes with missing key error

2 Answers