I want to generate 6 digit unique number in Firbase (unique must)
above attendeeCode should be unique on every new attendess entry
I am new in firebase and I have searched alot but could not find
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Siddhpura Amit
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Can you try this https://stackoverflow.com/a/28822372/4856245 – Jeffrey Rajan Jun 06 '17 at 12:00
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1That is unique, but not six characters – theblindprophet Jun 06 '17 at 12:07
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There is nothing specific to Firebase about generating a 6 digit number. But to ensure it must be unique, you'll want to look at [one](https://stackoverflow.com/q/35243492) [of](https://stackoverflow.com/q/37506003) [these](https://stackoverflow.com/q/29970681). – Frank van Puffelen Jun 06 '17 at 12:21
1 Answers
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Create a six digit number that corresponds to the nth entry into attendees. And then keep track of that number elsewhere.
You can find in other questions that Firebase still does not support COUNT or LENGTH queries.
Create a path called /meta-data (arbitrary) and save the number of current attendees:
meta-data: {
num_of_attendees: "000000" // parse this client side and send back padded string to keep 6 characters
}
Grab the value every time you add an attendee, increment it, and send it back. This keeps you from grabbing a list of all attendees and getting the length client-side.
A new option: Firebase Cloud Functions
This is still in beta, but is having fair success. They provided and example of this functionality here:
theblindprophet
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Thank you so much but currently I have already done like that, but although posted question might be I get something new from someone :) – Siddhpura Amit Jun 06 '17 at 12:27
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This won't work as expected because client can work offline too, the count change in server may not be realtime so it can be conflict – PRAJIN PRAKASH Dec 30 '21 at 04:13