setObjectForKey: key cannot be nil

[joeblau]

Running the code below causes setObjectForKey: key cannot be nil in Swift. I'm not sure if I'm actually using this correctly or not, but I can't seem to get any of the category functionality working.

    var grp = GroupRLMObject()
    grp.name = "David Foster Wallace"

    // Get the default Realm
    let realm = RLMRealm.defaultRealm()
    // You only need to do this once (per thread)

    // Add to the Realm inside a transaction
    realm.beginWriteTransaction()
    realm.addObject(grp)
    realm.commitWriteTransaction()

    let results: NSDictionary = grp.JSONDictionary() as NSDictionary

[matthewcheok]

Do you mind posting your class definition for GroupRLMObject?

[joeblau]

class GroupRLMObject: RLMObject {
    dynamic var id = ""
    dynamic var name = ""
    dynamic var color = ""
    dynamic var on: Bool = false
    dynamic var createdAt = NSDate()
    dynamic var modifiedAt = NSDate()
}

[matthewcheok]

To use the JSONDictionary() method, you need to implement class func JSONOutboundMappingDictionary() -> NSDictionary, which maps from properties in your object to the JSON keys you want.

[joeblau]

So is this quote from the documentation still true?

Leaving out either one of the above will result in a mapping that assumes camelCase for your properties which map to snake_case for the JSON equivalents.

I thought that if i didn't define anything, I would get some boilerplate JSON using default mapping.

[matthewcheok]

There seems to be a problem with defining the model in Swift.
This works for me (the default mapping works):

@interface GroupRLMObject : RLMObject

@property NSString *id;
@property NSString *name;
@property NSString *color;
@property BOOL on;
@property NSDate *createdAt;
@property NSDate *modifiedAt;

@end

@implementation GroupRLMObject

+ (NSDictionary *)defaultPropertyValues {
    return @{
               @"id": @"",
               @"name": @"",
               @"color": @"",
               @"on": @(NO),
               @"createdAt": [NSDate date],
               @"modifiedAt": [NSDate date]
    };
}

@end

[matthewcheok]

This issue should now be fixed in the latest release 0.2.3

[joeblau]

👍 Thanks