koobas.hobune.stream
Setting the parent of an instantiated prefab error
Hello,
Before anything, I have looked around, as this seems to be a common error and quite well documented. I know that the error occurs when trying to modify the transform of a prefab. I do not think I am doing that.
I have the following script attached to a prefab object - it's a card for a card game. The script is to drag and drop the card.
It works very well as long as the card is instantiated before I play the game ; if I instantiate it in game and try to move it I get the following error :
Setting the parent of a transform which resides in a Prefab Asset is disabled to prevent data corruption
public class CardDrag : MonoBehaviour, IBeginDragHandler, IDragHandler, IEndDragHandler
{
// HANDLES DRAG OF CARDS
private Transform originalParent; // saving the original parent
private Card card; // Card is a scriptable object, card holds data
private Transform canvas; // a reference to the main canvas
public void SetCanvas(Transform setCanvas)
{
canvas = setCanvas;
}
public void OnBeginDrag(PointerEventData eventData)
{
originalParent = transform.parent;
transform.SetParent(canvas); // WHERE THE ERROR HAPPENS
}
public void OnDrag(PointerEventData eventData)
{
gameObject.transform.position = Input.mousePosition;
}
public void OnEndDrag(PointerEventData eventData)
{
gameObject.transform.SetParent(originalParent);
}
}
The script that handles cards in hand is the following one ; it instantiates the cards that are to be dragged in the game.
public class HandManager : MonoBehaviour
{
// MANAGES GENERAL BEHAVIOURS FOR THE HAND OF CARDS
public GameObject cardPrefab; // a prefab reference to a card
public Transform canvas; // a reference to the main UI canvas
public Hand availableCards; // another scriptable object, which holds a "public List<Card> cards;"
private void Start()
{
foreach (Card card in availableCards.cards)
{
SetUpCard(card);
}
}
private void SetUpCard(Card cardData)
{
GameObject newCard= Instantiate(cardPrefab, transform); // instantiating new card
newCard.GetComponent<CardManager>().SetCardData(cardData); // setting the card's data
newCard.GetComponent<CardDrag>().SetCanvas(canvas);
}
}
I have been looking this error up, and it is always said that the problem occurs when attempting to change a prefab's parent instead of a prefab's instance's parents.
I do not see the problem though, since I believe I'm instantiating the cards properly in the SetUpCard() function ; and the script that manages the dragging is attached to that instance.
Any insights greatly appreciated !
Cheers !!
Turns out the error message meant the canvas was the problem.
I had messed up the reference in the editor...
