Fixed account delete can not delete all related data (#767)

src/main/java/emu/grasscutter/database/DatabaseHelper.java

@@ -16,6 +16,8 @@ import emu.grasscutter.game.inventory.GameItem;
 import emu.grasscutter.game.mail.Mail;
 import emu.grasscutter.game.player.Player;
 
+import static com.mongodb.client.model.Filters.eq;
+
 public final class DatabaseHelper {
 	public static Account createAccount(String username) {
 		return createAccountWithId(username, 0);
@@ -101,17 +103,20 @@ public final class DatabaseHelper {
 		// This should optimally be wrapped inside a transaction, to make sure an error thrown mid-way does not leave the
 		// database in an inconsistent state, but unfortunately Mongo only supports that when we have a replica set ...
 
-		// Delete mails, gacha records, items and avatars.
-		DatabaseManager.getDatastore().find(Mail.class).filter(Filters.eq("ownerUid", target.getPlayerUid())).delete();
-		DatabaseManager.getDatastore().find(GachaRecord.class).filter(Filters.eq("ownerId", target.getPlayerUid())).delete();
-		DatabaseManager.getDatastore().find(GameItem.class).filter(Filters.eq("ownerId", target.getPlayerUid())).delete();
-		DatabaseManager.getDatastore().find(Avatar.class).filter(Filters.eq("ownerId", target.getPlayerUid())).delete();
+		// Delete Mail.class data
+		DatabaseManager.getDatabase().getCollection("mail").deleteMany(eq("ownerUid", target.getPlayerUid()));
+		// Delete Avatar.class data
+		DatabaseManager.getDatabase().getCollection("avatars").deleteMany(eq("ownerId", target.getPlayerUid()));
+		// Delete GachaRecord.class data
+		DatabaseManager.getDatabase().getCollection("gachas").deleteMany(eq("ownerId", target.getPlayerUid()));
+		// Delete GameItem.class data
+		DatabaseManager.getDatabase().getCollection("items").deleteMany(eq("ownerId", target.getPlayerUid()));
 
 		// Delete friendships.
 		// Here, we need to make sure to not only delete the deleted account's friendships,
 		// but also all friendship entries for that account's friends.
-		DatabaseManager.getDatastore().find(Friendship.class).filter(Filters.eq("ownerId", target.getPlayerUid())).delete();
-		DatabaseManager.getDatastore().find(Friendship.class).filter(Filters.eq("friendId", target.getPlayerUid())).delete();
+		DatabaseManager.getDatabase().getCollection("friendships").deleteMany(eq("ownerId", target.getPlayerUid()));
+		DatabaseManager.getDatabase().getCollection("friendships").deleteMany(eq("friendId", target.getPlayerUid()));
 
 		// Delete the player.
 		DatabaseManager.getDatastore().find(Player.class).filter(Filters.eq("id", target.getPlayerUid())).delete();