android - Firebase Database: add rule to find a particular value out of all childs -


i want setup security rules database , want users , admins read particular group, rules don't work.

the work when set specific index. don't know how can check indexes. possible in way?

database: database

rules:

{   "rules": {     "groups": {       "$groupid": {         ".write": "!data.exists()",         ".read": "data.child('users').child('$index').val() == auth.uid || data.child('admins').child('$index').val() == auth.uid"       }     },     "users": {       "$uid": {         ".read": "auth != null",         ".write": "$uid === auth.uid"       }     }     } }

i suggest change database structure this. put user's id child key of users , admins

{     "groups": {         <groupid1>: {             "admins": {                 <uid1>: true,                 <uid2>: true             },             "description": "some description",             "users": {                 <uid3>: true,                 <uid4>: true,                 <uid5>: true             },             ...         },         <groupid2>: {             ...         }     } }

then database rules job

{     "rules": {         "groups": {             "$groupid": {                 ".write": "!data.exists()",                 ".read": "data.child('users').child(auth.uid).val() == true || data.child('admins').child(auth.uid).val() == true"             }         }     } }

hope helps :)


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