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Config incremental counter via Firebase Realtime Database
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| { | |
| "rules": { | |
| ".read": false, | |
| ".write": false, | |
| "incremental_counter": { | |
| ".validate": "newData.isNumber() && newData.val() === data.val() + 1", | |
| ".read": true, | |
| ".write": true | |
| } | |
| } | |
| } |
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