Ensuring the length of an array meets security requirements in Firebase rules

Can the votes array be restricted to exactly 5 entries?

Checking if newData.child('votes').val().length === 5) doesn't work because the length property only applies to strings. Here is a sample of my data:

votes
   $voteID
     page:"12345"
     user: "facebook:1234567"
     votes: {
       -K3M2kpTEtXRk-sHV6FO: true
       -K3M2kp_5vZDCZKUke2M: true
       -K3M2kpe7l22mYA1dc6D: true
       -K3M2kqhpgehSSUAcFLl: true
       -K3M2krABl2tU-cekpDA: true
    }

Is there a way to enforce this validation for exactly 5 entries in the array?

javascriptfirebasefirebase-security

Answer №1

What do you think of this approach?

"!data.hasChild('Y')"

where Y represents the desired length plus one +1

Additionally, for validation purposes as per your requirements, you could consider implementing:

"$index" : { 
   ".validate" : "... insert specific validation here .. "
}

This solution offers flexibility without restricting you and can accommodate arrays of any size.

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