does root node rule cascase to child and its subchild in firebase? -

in docs told rules cascade , children can't revoke privileges later in chat example root read , write rules default false,so why doesn't cascade? doc link

good question.

when rules cascade, read permissions cases. once have permission read node, cannot take permission away @ lower level.

so can start ".read": false @ top-level , allow reads lower (snippet firebase documentation on security rules):

{   "rules": {     ".read": false,     "room_names": {       // room names can enumerated , read       // cannot modified since no write rule       // explicitly allows       ".read": true, 

but opposite not work. cannot nobody allowed see specific room name once you've said every can see room names:

// snippet not work {   "rules": {     ".read": false,     "room_names": {       // room names can enumerated , read       // cannot modified since no write rule       // explicitly allows       ".read": true,       "my_secret_room": {           // not work           // since we've said every can read room names           // cannot take permission away anymore           ".read": false       }