I have parent with many children like this:
Parent:{
"childe1":"data",
"childe2":"data",
"childe3":"data",
"childe4":"data",
"childe5":"data"
}
How can I update the children [ childe1 , childe2 , childe3 ]
at same time, preventing any other user from updating them at same time?
The limit you're referring to is the limit for the number of concurrently connected users to Firebase Realtime Database on the free Spark plan. Once you upgrade to a payment plan, your project will allow 200,000 simultaneously connected users.
For updating a single node in our JSON database, we simply use setValue() on the correct child reference.
Create multiple Realtime Database instances In the Firebase console, go to the Data tab in the Develop > Database section. Select Create new database from the menu in the Realtime Database section. Customize your Database reference and Security rules, then click Got it.
To update multiple properties at the same time, you can run an update()
call:
ref.child("Parent").update({
childe1: "newdata",
childe2: "newdata",
childe3: "newdata"
});
You can even specify paths as the keys, in case the properties are at different levels in the tree. Even though that doesn't seem to be the case here, the syntax would be:
ref.update({
"Parent/childe1": "newdata",
"Parent/childe2": "newdata",
"Parent/childe3": "newdata"
});
The exact validation depends a bit on what you'd like to allow, but in general you'd write .validate
rules on the server that validate that newData
meet your requirements.
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