String enums not saving

[adeeldb]

Models are as follows:

enum Gender : String {
    case male, female, undefined
}

@objcMembers
class User: Base {
    dynamic var gender: Gender = .undefined

    override func encode(_ key: String, value: Any?) -> Any? {
        if key == "gender" {
            return self.gender.rawValue
        }

        return nil
    }
    
    override func decode(_ key: String, value: Any?) -> Bool {
        if key == "gender" {
            if let value = value as? String, let gender = Gender(rawValue: value) {
                self.gender = gender
            }
            
            return true
        }
        
        return false
    }
}

[1amageek]

?

[adeeldb]

When the user object is updated, the gender property does not persist.

[1amageek]

https://github.com/1amageek/Pring/blob/master/PringTests/TestDocument.swift#L22
https://github.com/1amageek/Pring/blob/master/PringTests/DocumentCRUDTests.swift#L83

The test is working normally.
Are you using the latest version of Pring?

[1amageek]

@adeeldb Did you solve?

[adeeldb]

@1amageek the enum in the test is of type Int. Unfortunately, String enums don't work.

[1amageek]

@adeeldb Hi.
I was able to reproduce your behavior.

The reason why String does not work is in KVO.
Pring internally uses KVO. KVO does not work for enums that do not depend on @objc.

[1amageek]

https://github.com/1amageek/Pring/blob/master/Pring/Object.swift#L441

I have created a Function to update explicitly.

[adeeldb]

@1amageek My solution in my current project is as follows:

protocol PringEnum {
    var stringValue: String { get }
}

extension PringEnum where Self: RawRepresentable, Self.RawValue == String {
    var stringValue: String { return rawValue }
}

enum MyEnum : String, PringEnum  { 
    case something 
}

class MyObject : Object {
	override func encode(_ key: String, value: Any?) -> Any? {
	        let data = Mirror(reflecting: self).children.flatMap{ (label: $0.label, value: $0.value) }.reduce(into: [String: Any]()) { dictionary, item in
	            if let label = item.label {
	                dictionary[label] = item.value
	            }
	        }
	        if let data = data[key], let value: PringEnum = data as? PringEnum {
	            return value.stringValue
	        }
	        else {
	            return super.encode(key, value: value)
	        }
	    }

	override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
	        super.observeValue(forKeyPath: keyPath, of: object, change: change, context: context)
	        Mirror(reflecting: self).children.forEach { child in
	            guard let property = child.label.flatMap({ (label: $0, value: child.value) }) else { return }
	            
	            switch property.value {
	            case let rawRepresentable as PringEnum:
	                updateValue[property.label] = rawRepresentable.stringValue
	            default:
	                break
	            }
	        }
	}
}

[1amageek]

@adeeldb
observeValue is not valid for properties that do not inherit from NSObject.
I think updates will not work.

[adeeldb]

@1amageek the above approach seems to be working fine, given that String does inherit from NSObject.