Firebase how to generate a unique numeric ID for key

Question

I need numeric IDs for human readability  How do I get it in Firebase    I want numeric ID for keys  e g   000000001    000000002   00000003   00000004    The reason I need it is because these IDs will become the permanent object ID both online and offline  I want users to be able to browse that object page by just entering URL   objects 00000001  without efforts    I am asking here  because I want to know if this can be done without using  priority  sub-properties  etc  I guess set method can do it somehow  If it is not possible  just tell me no  I can accept that answer

User · Answer

As the docs say  this can be achieved just by using set instead if push   As the docs say  it is not recommended  due to possible overwrite by other user at the  same  time    But in some cases it s helpful to have control over the feed s content including keys   As an example of webapp in js  193 being your id generated elsewhere  simply    firebase initializeApp firebaseConfig     var data          name   Prague         firebase database   ref   child  areas   child  193   set data     This will overwrite any area labeled 193 or create one if it s not existing yet

User · Answer

https   firebase google com docs firestore manage-data transactions  Use transactions and keep a number in the database somewhere that you can increase by one  This way you can get a nice numeric and simple id

User · Answer

I d suggest reading through the Firebase documentation  Specifically  see the Saving Data portion of the Firebase JavaScript Web Guide  From the guide   Getting the Unique ID Generated by push     Calling push   will return a reference to the new data path  which you can use to get the value of its ID or set data to it  The following code will result in the same data as the above example  but now we ll have access to the unique push ID that was generated      Generate a reference to a new location and add some data using push   var newPostRef   postsRef push    author   quot gracehop quot    title   quot Announcing COBOL  a New Programming Language quot          Get the unique ID generated by push   by accessing its key var postID   newPostRef key    Source  https   firebase google com docs database admin save-data section-ways-to-save  A push generates a new data path  with a server timestamp as its key  These keys look like -JiGh 31GA20JabpZBfa  so not numeric  If you wanted to make a numeric only ID  you would make that a parameter of the object to avoid overwriting the generated key   The keys  the paths of the new data  are guaranteed to be unique  so there s no point in overwriting them with a numeric key  You can instead set the numeric ID as a child of the object  You can then query objects by that ID child using Firebase Queries     From the guide   In JavaScript  the pattern of calling push   and then immediately calling set   is so common that we let you combine them by just passing the data to be set directly to push   as follows  Both of the following write operations will result in the same data being saved to Firebase       These two methods are equivalent  postsRef push   set     author   quot gracehop quot     title   quot Announcing COBOL  a New Programming Language quot      postsRef push     author   quot gracehop quot     title   quot Announcing COBOL  a New Programming Language quot        Source  https   firebase google com docs database admin save-data getting-the-unique-key-generated-by-push

User · Answer

Adding to the  htafoya answer  The code snippet will be const getTimeEpoch        gt        return new Date   getTime   toString

User · Answer

As explained above  you can use the Firebase default push id   If you want something numeric you can do something based on the timestamp to avoid collisions  f e  something based on date hour second ms  and some random int at the end   01612061353136799031   Which translates to   016-12-06 13 53 13 679 9031   It all depends on the precision you need  social security numbers do the same with some random characters at the end of the date   Like how many transactions will be expected during the day  hour or second  You may want to lower precision to favor ease of typing   You can also do a transaction that increments the number id  and on success you will have a unique consecutive number for that user  These can be done on the client or server side    https   firebase google com docs database android read-and-write

[push] Firebase: how to generate a unique numeric ID for key?

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