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Question by jandd661 · Aug 01, 2017 at 08:14 AM · scripting probleminspectorvariablespublic

Create "Optional" public variable that won't throw an error

Hello, I am trying to create a public variable of type GameObject that would be visible in the inspector but not required. With in the code I am checking for it's value and proceeding accordingly. The problem is, when the script fires (runs on trigger) It errors

nassignedReferenceException: The variable TriggerByObject of ObjectMover_Triggers has not been assigned.

I have also tried "Try" and "Catch" with no luck. So I guess the question is "How do I make a public variable optional." Any help would be much appreciated. Thanks!

[UPDATE]

I managed to work around my problem by creating a fake object then assigning it to my public Object variable at runtime if it was empty. I would still like to know if I missing something when it comes to unassigned public variables though.

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Answer by UnityCoach · Aug 01, 2017 at 09:45 AM

You shouldn't have to assign fake objects.

 [SerialisedField] GameObject _theObject; // keeping it private but serialised

Then, whenever you need to use it, test if it's null.

 if (_theObject == null)
     return; // exit method for example

Or you can even assign the default value if null in Awake

 void Awake ()
 {
     if (_theObject == null)
         _theObject = GameObject.Find("defaultObject");
 }
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avatar image jandd661 · Aug 02, 2017 at 07:54 PM 0
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I did figure that out later. Thanks for your reply.

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