{ "comments" : { "-KgccDhWMR14MzcFoKnU" : { "comment" : "Hello World", "email" : "nightghostjiyou@gmail.com", "name" : "JiYouMCC", "post" : "/2017/03/29/to-do-list", "timestamp" : 1491035286677 }, "-KgccIGBbwzwFVXwhrN_" : { "comment" : "Reply Hello World", "email" : "nightghostjiyou@gmail.com", "name" : "JiYouMCC", "post" : "/2017/03/29/to-do-list", "reply" : "-KgccDhWMR14MzcFoKnU", "timestamp" : 1491035305348 }, "-KgccPJQhA0dJkti49la" : { "comment" : "How to use it", "email" : "nightghostjiyou@gmail.com", "name" : "JiYouMCC", "post" : "/2017/03/28/how-to-use-comments-cn", "timestamp" : 1491035334230 } }, "posts" : { "2017" : { "03" : { "28" : { "how-to-use-comments-cn" : { "count" : 1 } }, "29" : { "to-do-list" : { "count" : 2 } } } } } } 

{ "rules": { ".read": true, "comments": { ".indexOn": ["post", "timestamp"], "$commentid": { ".write": "!data.exists() && newData.hasChild('name') && newData.hasChild('email') && newData.hasChild('post') && newData.hasChild('comment')", ".validate": "newData.child('name').val().length > 0 && newData.child('name').val().length < 20 && newData.child('name').isString() && newData.child('email').val().matches(/^[\\.a-zA-Z0-9_-]+@[a-zA-Z0-9_-]+(\\.[a-zA-Z0-9_-]+)+$/) && newData.child('post').val().length > 0 && newData.child('comment').val().length > 0 && newData.child('comment').val().length < 2048 && newData.child('comment').isString() && newData.child('timestamp').isNumber() && (!newData.hasChild('url') || newData.child('url').val().matches(/^http(s?):\\/\\/[0-9a-zA-Z]([-.\\w]*[0-9a-zA-Z])*((0-9)*)*(\\/?)([a-zA-Z0-9\\-\\.\\?\\,\\'\\/\\\\+&=%\\$#_]*)?$/))" } }, "posts": { // the path format depends on your own jekyll permalink setting "$year":{ "$month":{ "$day":{ "$title":{ ".write": "newData.hasChild('count')", ".validate": "newData.child('count').isNumber() && newData.child('count').val() >= 0" } } } } } } }