Firebase Rules: What is .contains()? -


i have read through firebase documentation , not understand .contains().

below sample rules firebase database in documentation:

{   "rules": {     "rooms": {       "$room_id": {         "topic": {           // room's topic can changed if room id has "public" in           ".write": "$room_id.contains('public')"         }       }     }   } }

may know $room_id.contains('public')?

is referred child of $room_id?

$room_id matched wildcard key name appears parent of "topic". rule allowing writes if key name contains string "public" anywhere in it.

so, if tried change value of /rooms/public_roomid/topic value, allowed. however, write of /rooms/roomid/topic rejected.


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