Problem when I call fonction with child class

Questions & Answers
1

Hello, i’m french but i think find more answers in this forum. Sorry if my english is bad.
I try to call a parent fonction when an evenement “on trigger enterer” is coming in a child class.
Child class :

public class PickUp : MonoBehaviour {

  public Item item;

  Inventory inventoryScript;

    void OnTriggerEnter(Collider other)
    {
        inventoryScript.AddItem(item);
    }
}

And my parent class :

public class Inventory : MonoBehaviour {

    public const int nbSlots = 30;

    public Item[] items = new Item[nbSlots];

    public GameObject A1;

    public void AddItem(Item itemToAdd)
    {
        for (int i = 0; i < items.Length; i++)
        {
            if (items *== null)*

{
items = itemToAdd;
A1.GetComponent().sprite = itemToAdd.sprite;
return;
}
}
}
}
My error appear in “PickUp” script at line 13 : inventoryScript.AddItem(item);
thank you in advance

2

If your pasted scripts are all there is to your scripts, then this is because your Pickup script has no reference to the inventory script. it just has a variable that can hold a reference to one. You should either give that Inventory variable a [SerializeField] attribute, and link it in the inspector, or do something like this.

void OnTriggerEnter(Collider other)
{
	if(inventoryScript == null)
	{
		// NOTE: this may need to change It was not clear to me from your initial post what the hierarchy was like
		// so your Inventory component may not be directly on this items parent. This is just an example.
		inventoryScript = transform.parent.GetComponent<Inventory>();
	}
	if(inventoryScript == null)
	{
		Debug.LogError("Failed to find Inventory component on parent");
	}
	else	
	{
		inventoryScript.AddItem(item);
	}
}