How to remove multiple children in one call - Realtime Firebase-CodePudding

I wan to delete multiple children with known key. I searched all the related posts but it doesn't seem to work. It shows red bracket.

Below is my code which i refer from other posts:

var updates = { } 

for(i in removedProductVariationIdList){
    updates["user/$i"] = null
}

Screenshot:

Firebase Structure (I want to remove 3, 4 under Product_Variation for example, which i know the key) :

CodePudding user response：

Java doesn't support template literals with the $i notation in regular strings, as far as I know. The simplest way to build a map with the null values:

Map<String, Object> updates = new HashMap<>();
for(i in removedProductVariationIdList){
    updates.put("user" i, null);
}

Also see: