Only has children .write rule [Firebase] -

given following rule:

   {     "rules": {         "users": {            "$uid": {               "name":{                 ".read": "auth != null && auth.uid == $uid",                 ".write": "auth != null && auth.uid == $uid"               }            }         }       }     } 

is there way in firebase limit children can written object?

for example limit client writing object 1 attribute:

name {   "value": "value" } 

i know there .validate , haschildren() doesn't prevent user legally write object under $uid undesired attributes.

nothing preventing client writing object follows:

name {   "value":"value",   "unwantedattribute":"wastingspace" } 

is there equivalent hasthosechildrenonly()?

a .write rule determines who can write data location, not what data can write.

to determine structure of data written, you'll need .validate rule. in case can name required , must string with:

{   ".validate": "newdata.haschild('name')",   "name": {     ".validate": "newdata.isstring()"   },   "$other": {     ".validate": false   } } 

the validate on top-level ensures new data must have name property. without this, can delete name, because deleting data not trigger validation.

the second validate ensures name string.

the third validation ensures child name rejected.