Firebase prevent duplicate categories using rule

Question

Here is my database structure for categories

I want prevent duplicate data using Firebase rules

here is my firebase rule

 {
    "rules": {
    ".read": "auth != null",
    ".write": "auth != null",


    "categories": {
      "$catid": {

       ".validate": "!root.child(newData.child('type').val()).exists()"
      }
    }
} 
}

When I am trying to insert again java it's inserting duplicate of java

how do I prevent to insert duplicate category

my question is similar to this https://groups.google.com/forum/#!topic/firebase-talk/_2YQ--nmTzw — Munish Kapoor, Oct 07 '16 at 08:12
And the recommendation there is the same: you cannot ensure unique values with security rules. Only unique keys. — Frank van Puffelen, Oct 07 '16 at 08:14

score 4 · Accepted Answer · edited May 23 '17 at 12:06

4

As per suggested by Frank van Puffelen

I have changed my data structure as following

and also updated Firebase rules as following

{
 "rules": {
   ".read": "auth != null",
   ".write": "auth != null",

 "categories": {
   "$categorie":{
        ".validate": "!data.exists()"
   }
 }
}
}

Now it's not inserting data if data is already there.

Thanks Frank van Puffelen

edited May 23 '17 at 12:06

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answered Oct 07 '16 at 08:42

Munish Kapoor

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Firebase prevent duplicate categories using rule

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