[Firebase] Firebase : rules examples

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Michael Ahern

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Nov 16, 2015, 10:05:30 AM11/16/15
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Hi, 

I'm new to rules and have seen some back and forth on this question on stackexchange here: http://stackoverflow.com/questions/27179094/using-indexon-with-nested-keys-in-firebase

Is is possible to have an .indexOn that is nested below two dynamic keys, the first being $userid and the second being an $id value under a static subkey.

Thanks in advance for any ideas or suggestions.

The data looks like:

{
    "users" :  {
      "$userid" : {
        "subkey" : "$id" { "timestamp" : "timevalue" }
    }
}

Will this rule work to index queries on "users/$userid/subkey/$id/timestamp" ?

{
    "rules": {
      "users": { 
        "$userid": {
        ".read": "auth !== null && (auth.uid == $userid)",
        ".write": "auth !== null && auth.uid == $userid",
        "subkey": { "$id" : { ".indexOn" : ["timestamp"] } }
        }
      }  
    }
}

Mike Koss

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Nov 17, 2015, 5:28:26 PM11/17/15
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I think the answer is yes you can.  But it looks to me like you have the .indexOn one level too deep in your rules.  Since subkey is the collection, and $id is an individual instance, the .indexOn should be defined at the collection level (immediate child of the subkey rule).

Documented here:


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Michael Ahern

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Nov 17, 2015, 5:35:58 PM11/17/15
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Got it, like below then. Thanks!

{
    "rules": {
      "users": { 
        "$userid": {
        ".read": "auth !== null && (auth.uid == $userid)",
        ".write": "auth !== null && auth.uid == $userid",
        "subkey": { ".indexOn" : ["timestamp"] } 
        }
      }  
    }
}

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Mike Koss

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Nov 17, 2015, 8:58:07 PM11/17/15
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Yes.

To view this discussion on the web visit https://groups.google.com/d/msgid/firebase-talk/CANzFfYDp7zE2xqyhrvMrMa-PJwQD8SNVZF%3DN%2Bh-G4OHrjEm50w%40mail.gmail.com.

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