Making a part module, having trouble with persistance. Please help!

[Whyren]

Hi all! I'm working on making my first part module. The intent is to make a very simple module that will record the last time the vehicle was active and then, the next time the vehicle is loaded after you pilot other vessels, the amount of time you were away is calculated and a resource you should have been generating will be calculated and added to the ship. The code all seems to work, except that the "lastUpdated" time is still 0 when the vessel is reloaded. It seems like it isn't being saved or isn't being loaded. Does anyone have any advice for me?

Part Config

MODULE
{

    name = AFKResources
    Resource = Snacks
    RatePerSecond = 1
}

Part Module

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using UnityEngine;


    public class AFKResources : PartModule
    {
        [KSPField(guiActive = true)]
        public string Resource = "";


        [KSPField(guiActive = true)]
        public float RatePerSecond = 0.0f;


        [KSPField(isPersistant = true, guiActive = true)]
        public double lastUpdate = 0;


        public override void OnStart(PartModule.StartState x)
        {



                Debug.LogWarning("////////////////////////////////////////////////////////////////");
                Debug.Log("AFKResources OnStart.  lastUpdate: " + lastUpdate.ToString() + "  Resource: " + Resource + "  Start State: " + x.ToString());
                Debug.LogWarning("////////////////////////////////////////////////////////////////");
                if (lastUpdate > 0)
                {
                    if (lastUpdate < Planetarium.GetUniversalTime())
                    {
                        double passedTime = Planetarium.GetUniversalTime() - lastUpdate;
                        double resourceAmount = passedTime * RatePerSecond;
                        double waste = part.RequestResource(Resource, resourceAmount * -1);
                        lastUpdate = 0;


                        ScreenMessages.PostScreenMessage(part.vessel.name + ": " + resourceAmount.ToString() + " Snacks Harvested", 5f, ScreenMessageStyle.UPPER_CENTER);
                        Debug.LogWarning("////////////////////////////////////////////////////////////////");
                        Debug.Log("AFKResources WORKING.  Harvset: " + resourceAmount.ToString() + "  Waste: " + waste.ToString());
                        Debug.LogWarning("////////////////////////////////////////////////////////////////");
                    }
                }


        }
        public override void OnUpdate()
        {
            lastUpdate = Planetarium.GetUniversalTime();
        }


        public override void OnSave(ConfigNode node)
        {
            node.SetValue("lastUpdate", lastUpdate.ToString());
            Debug.LogWarning("////////////////////////////////////////////////////////////////");
            Debug.Log("AFKResources SAVED.  lastUpdate: " + lastUpdate.ToString());
            Debug.LogWarning("////////////////////////////////////////////////////////////////");
        }


        public override void OnLoad(ConfigNode node)
        {
            if(node.HasNode("lastUpdate")){lastUpdate = Double.Parse(node.GetValue("lastUpdate"));}
            Debug.LogWarning("////////////////////////////////////////////////////////////////");
            Debug.Log("AFKResources LOADED.  lastUpdate: " + lastUpdate.ToString());
            Debug.LogWarning("////////////////////////////////////////////////////////////////");
        }


    }

[DMagic]

I'm not sure that you can use doubles in a KSPField, try it with a float.

[Whyren]

I'll give that a try, but double is one of the types that taraniselsu uses in his examples. https://github.com/taraniselsu/TacExamples/blob/master/05-KspFields/Source/KspFieldsModule.cs

In normal situations do I need to do the save and load or is that handled automatically by flagging the field as persistent?

[Whyren]

And, as it turns out, that does the trick! I really appreciate you taking the time to help. It has been very difficult to find solid resource on the API.

[DMagic]

Any persistent KSPFields handle saving and loading on their own, and they run before OnSave and OnLoad.

[Whyren]

Okay. I thought they weren't behaving that way because I was using the double and it wasn't working. I'll have to go back and remove my OnSave and OnLoad sections. Thanks again.