Firestore DocumentReference mapping

[Can Aktepe]

Hi all,

I using firestore with '@flutter' first time. There are 2 collections and I want to use  DocumentReference type. Collections does looking as below. I added a DocumentReference type field to Activities collection. this reference do store a user fromuser collection. Can you help me about mapping  2 collections a single model.

[Suzuki Tomohiro]

Would you explain the problem you observe?

(I’m seeing that you’re passing a document reference to a function that takes a map. But let’s start with the problem you observe)

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[Can Aktepe]

Hi,

actually, when I call activities data, I want to include documentreference data in the response.

[Suzuki Tomohiro]

Then iclude DocumentReference data in the response. Would you explain the problem you observe?

On Sat, Jul 18, 2020 at 02:40 Can Aktepe <akte...@gmail.com> wrote:

Hi,

actually, when I call activities data, I want to include documentreference data in the response.

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[Can Aktepe]

I don't know how can I include it in to response

[Suzuki Tomohiro]

data['author'] is the document reference (assuming you store a document reference there)

On Sat, Jul 18, 2020 at 07:29 Can Aktepe <akte...@gmail.com> wrote:

I don't know how can I include it in to response

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[akte...@gmail.com]

actually, I asked a basic question, I want to cast DocumentReference object in to Activity model, 

as a result;

I want to show like result to below.

ACTIVITY MODEL

{ 

    active : true,

    author : {

         id : 1,

         email : "em...@email.com"

    },

    complex : "complex text",

    maxPlayer : 14,

    players : [

         0 : "Player 1",

         1 : "Player 2"

    ],

    title : "Title text"

}

18 Temmuz 2020 Cumartesi tarihinde saat 14:38:54 UTC+3 itibarıyla suz...@gmail.com şunları yazdı:

[Suzuki Tomohiro]

Still not sure what problem you are facing. Are you looking for DocumentReference.get() ?

final authorDocumentReference = data[‘author’];

final author = authorDocumentReference.get();

final user = User.fromMap(author)

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[akte...@gmail.com]

yes, this is working. Thank you. However, How can I do async call in the Factory function?

author variable does return as Future<DocumentSnapshot>

 factory Activity.fromMap(Map data) {

    // var x = User.fromMap(data['author']);

    var activity = Activity(

      title: data['title'],

      complex: data['complex'],

      maxPlayer: data['maxPlayer'],

      active: data['active'],

      players: List.from(

        data['players'],

      ),

    );

    final authorDocumentReference = data["author"] as DocumentReference;

    final author = authorDocumentReference.get();

    author.then((value) => {

          activity.author = User.fromMap(value.data),

          print(activity.author.email)

        });

    return activity;

  }

18 Temmuz 2020 Cumartesi tarihinde saat 17:52:30 UTC+3 itibarıyla suz...@gmail.com şunları yazdı:

[Suzuki Tomohiro]

Good. Now the problem is clear: you want to use async in a factory method but it doesn’t allow async.

Use async static method.

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