[cloud_firestore] Need id generator like createId() function in AngularFire #49

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1. cmkweber commented on Sep 9, 2019

   

   cmkweber

   on Sep 9, 2019

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   CollectionReference has an add method which returns an auto-generated ID:

   https://pub.dev/documentation/cloud_firestore/latest/cloud_firestore/CollectionReference/add.html
2. BondarenkoStas commented on Sep 11, 2019

   

   BondarenkoStas

   on Sep 11, 2019

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   @eugvb Please report if the comment above solved your issue.
3. eugvb commented on Sep 12, 2019

   

   eugvb

   on Sep 12, 2019

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   Maybe it is not perfect way, but I persist Document Id inside it. So I need generate id before calling add() method.
4. tantzygames commented on Sep 13, 2019

   

   tantzygames

   on Sep 13, 2019

   Last edited by tantzygames

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   I use:
   String id = reference.document().documentID;

   Then apply the id within the document and any other documents, then save.

   There is an issue with both this and add() that is only occurring recently. iOS is creating a different format of id than Android, where they used to be the same. So you may be better off creating your own id system...

   Edit: I notice this was new to 0.12.7 but is now consistent across iOS and Android in 0.12.8. Unfortunately the new format of id's are no longer chronological so I'm using the old PushIdGenerator for id's that I prefer to be chronological.
5. eugvb commented on Oct 8, 2019

   

   eugvb

   on Oct 8, 2019

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   Ok, storing Document Id in itself not good practice. So in this case no need for id generation.

   But what about transaction or batch writes?
   For example, I want to add document to collection and then store it Id in other document

   Firestore.instance.runTransaction((tx) async {
     String docId = 'docId';//It should be generated
     await tx.set(Firestore.instance.collection('collection').document(docId), {'some':'data'});
     //There i need docId to store it in other Document
     await tx.set(Firestore.instance.collection('collection2').document('DocumentId2'), {'docId':docId});
   });
   

   Transaction doesn't have add method, so I need use set with generated id.
   With Batch write situation is similar.
6. cmkweber commented on Oct 8, 2019

   

   cmkweber

   on Oct 8, 2019

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   Use document without passing a path:
   https://pub.dev/documentation/cloud_firestore/latest/cloud_firestore/CollectionReference/document.html
   This generates a unique id without setting it within database like add does.
7. eugvb commented on Oct 8, 2019

   

   eugvb

   on Oct 8, 2019

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   It is solution, thank you
8. eugvb

   closed this as completedon Oct 8, 2019
9. sultanmyrza commented on May 2, 2020

   

   sultanmyrza

   on May 2, 2020

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   I know its late but here is what I did

   String randomId() {
       var _randomId = Firestore.instance.collection('').document().documentID;
       print(randomId());
       return _randomId;
   }
   

   👍React with 👍3Reacted by Jon, Ferri Sutanto and Jido Park

   👎React with 👎1Reacted by Gintas Z.
10. rockclaver commented on May 29, 2020

    

    rockclaver

    on May 29, 2020

    Last edited by rockclaver

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    I know its late but here is what I did

    String randomId() {
        var _randomId = Firestore.instance.collection('').document().documentID;
        print(randomId());
        return _randomId;
    }
    

    Can this produce a unique ID? I am thinking it would somehow create an ID that already exists.
11. cmkweber commented on May 29, 2020

    

    cmkweber

    on May 29, 2020

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    They are unique: https://stackoverflow.com/questions/46618719/firestore-are-ids-unique-in-the-collection-or-globally
12. gintasz commented on Jul 20, 2020

    

    gintasz

    on Jul 20, 2020

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    I know its late but here is what I did

    String randomId() {
        var _randomId = Firestore.instance.collection('').document().documentID;
        print(randomId());
        return _randomId;
    }
    

    Doesn't work on web at the present moment (cloud_firestore: 0.13.7), getting this error:
    Function Firestore.collection() requires its first argument to be of type non-empty string, but it was: ""

    👍React with 👍1Reacted by mubeen-ikram
13. firebase

    locked and limited conversation to collaborators on Aug 20, 2020