Eugene Teh Eugene Teh - 1 month ago 33
JSON Question

How can I convert a Realm object to JSON in Swift?

I have two Realm tables declared:

class Task: Object {
dynamic var taskID: String = ""
let taskAssignedTo = List<Contacts>()
}

class Contacts: Object {
dynamic var contactEmail: String = ""
dynamic var contactName: String = ""
}


Final goal is to convert the Task Realm object into JSON. The method I'm thinking of is:

Convert the object to a dictionary using a method within the class

func taskToDictionary() -> [String: AnyObject] {
return [
"taskID" : self.taskID,
"taskAssignedTo" : self.taskAssignedTo._rlmArray.count //Not sure how to get the array
]
}


Convert the resulting dictionary into JSON with SwiftyJSON

let taskObject = Task()
let newTaskJSON = JSON(taskObject.taskToDictionary())


Right now, this converts ok, but:


  1. Is there a better way to do this?

  2. How can I convert the RLMArray into an array for JSON conversion?


Answer

Managed to find the answer here:

Can I serialize a RealmObject to JSON or to NSDictionary in Realm for Swift?

extension Object {
func toDictionary() -> NSDictionary {
    let properties = self.objectSchema.properties.map { $0.name }
    let dictionary = self.dictionaryWithValuesForKeys(properties)

    var mutabledic = NSMutableDictionary()
    mutabledic.setValuesForKeysWithDictionary(dictionary)

    for prop in self.objectSchema.properties as [Property]! {
        // find lists
        if let objectClassName = prop.objectClassName  {
            if let nestedObject = self[prop.name] as? Object {
                mutabledic.setValue(nestedObject.toDictionary(), forKey: prop.name)
            } else if let nestedListObject = self[prop.name] as? ListBase {
                var objects = [AnyObject]()
                for index in 0..<nestedListObject._rlmArray.count  {
                    if let object = nestedListObject._rlmArray[index] as? Object {
                        objects.append(object.toDictionary())
                    }
                }
                mutabledic.setObject(objects, forKey: prop.name)
            }
        }
    }
    return mutabledic
}
}

Update for Xcode 7 & Swift 2:

extension Object {
func toDictionary() -> NSDictionary {
    let properties = self.objectSchema.properties.map { $0.name }
    let dictionary = self.dictionaryWithValuesForKeys(properties)

    let mutabledic = NSMutableDictionary()
    mutabledic.setValuesForKeysWithDictionary(dictionary)

    for prop in self.objectSchema.properties as [Property]! {
        // find lists
        if let nestedObject = self[prop.name] as? Object {
            mutabledic.setValue(nestedObject.toDictionary(), forKey: prop.name)
        } else if let nestedListObject = self[prop.name] as? ListBase {
            var objects = [AnyObject]()
            for index in 0..<nestedListObject._rlmArray.count  {
                let object = nestedListObject._rlmArray[index] as AnyObject
                objects.append(object.toDictionary())
            }
            mutabledic.setObject(objects, forKey: prop.name)
        }

    }
    return mutabledic
}

}

Update to Xcode 8 and Swift 3 :

extension Object {
func toDictionary() -> NSDictionary {
    let properties = self.objectSchema.properties.map { $0.name }
    let dictionary = self.dictionaryWithValues(forKeys: properties)
    let mutabledic = NSMutableDictionary()
    mutabledic.setValuesForKeys(dictionary)

    for prop in self.objectSchema.properties as [Property]! {
        // find lists
        if let nestedObject = self[prop.name] as? Object {
            mutabledic.setValue(nestedObject.toDictionary(), forKey: prop.name)
        } else if let nestedListObject = self[prop.name] as? ListBase {
            var objects = [AnyObject]()
            for index in 0..<nestedListObject._rlmArray.count  {
                let object = nestedListObject._rlmArray[index] as AnyObject
                objects.append(object.toDictionary())
            }
            mutabledic.setObject(objects, forKey: prop.name as NSCopying)
        }
    }
    return mutabledic
}
}
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