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RealmAdvent Calendar 2015

Day 3

RealmObjectをDictionaryに変換する

Last updated at Posted at 2015-12-02

ObjectをDictionaryにする

Realm アドベントカレンダー三日目ですね.
ちっちゃな子ネタをどうぞ.

どれくらい思うことがあるのかわかりませんが,RealmのObjectをDictionaryとかに戻したい,相互変換したいって思ったことはありませんか?

私はあります.

import RealmSwift
extension Object {
    func toDictionary() -> Dictionary<String, AnyObject> {
        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]! {
            if let nestedObject = self[prop.name] as? Object {
                mutabledic.setValue(nestedObject.toDictionary() as NSDictionary, 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() as NSDictionary)
                }
                mutabledic.setObject(objects, forKey: prop.name)
            }
        }

        return mutabledic as NSDictionary as! Dictionary<String, AnyObject>
    }
}

簡単に解説してみると

        let properties = self.objectSchema.properties.map { $0.name }
        let dictionary = self.dictionaryWithValuesForKeys(properties)

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

このあたりで,Realm固有の型以外をだいたいNSMutableDictionaryにコピーできています.

objectSchema.properties でObjectのschemaを取得できます.
dictionaryWithValuesForKeys(properties) でSchemaをザザっとNSDictionaryにコピーできてしまいます.

ここから下は,再帰したりしながらListBaseや,ObjectをDictionary化していくコードですね.

ついでに,Camel CaseをSnake Caseに変換するコードも用意しました.

extension String {
    func snakeCaseString() -> String {
        var result = ""
        self.characters.forEach( { char in
let string = "\(char)" as NSString
result += string.isEqualToString(string.capitalizedString) ? "_\(string.lowercaseString)" : "\(char)"
        })
        return result
}

やっていることは超単純で,文字を一文字づつチェックして,大文字だったら"_小文字"に置き換えるだけというものです.これでだいたいsnake caseにできちゃいます.

そして,このあたりを組み合わせてJSONにするとかすれば

API -> Object -> Dictionary -> JSON -> API

みたいな流れがすごくやりやすくなるかと思います.

私の場合は

APIKit → Himotoki → Object → Dictionary → Himotoki

みたいな変換をちらほらしています

参考:http://stackoverflow.com/questions/31150087/can-i-serialize-a-realmobject-to-json-or-to-nsdictionary-in-realm-for-swift

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