From 274525a86afb8887623dad22507985a7d80c1163 Mon Sep 17 00:00:00 2001
From: Daniel Shiposha <dshiposha@usetech.com>
Date: Fri, 27 May 2022 13:10:33 +0000
Subject: [PATCH] fix: unable to destroy collection with nested tokens


---
--- a/pallets/nonfungible/src/lib.rs
+++ b/pallets/nonfungible/src/lib.rs
@@ -79,6 +79,8 @@
 		NonfungibleItemsHaveNoAmount,
 		/// Unable to burn NFT with children
 		CantBurnNftWithChildren,
+		/// Unable to burn a collection containing NFTs that have children
+		CantBurnCollectionWithNestedTokens
 	}
 
 	#[pallet::config]
@@ -293,6 +295,10 @@
 	) -> DispatchResult {
 		let id = collection.id;
 
+		if Self::collection_has_nested_tokens(id) {
+			return Err(<Error<T>>::CantBurnCollectionWithNestedTokens.into());
+		}
+
 		// =========
 
 		PalletCommon::destroy_collection(collection.0, sender)?;
@@ -966,6 +972,10 @@
 		);
 	}
 
+	fn collection_has_nested_tokens(collection_id: CollectionId) -> bool {
+		<TokenChildren<T>>::iter_prefix((collection_id,)).next().is_some()
+	}
+
 	fn token_has_children(collection_id: CollectionId, token_id: TokenId) -> bool {
 		<TokenChildren<T>>::iter_prefix((collection_id, token_id)).next().is_some()
 	}

-- 
gitstuff