Question: how to use this for mapping FirebaseFirestore.DocumentData in to a custom Object Module?

[aytunch]

Inside of my Cloud Functions code written in TypeScript, I have 2 custom models which I want to populate with FirebaseFirestore.DocumentData maps. Also when writing to Firestore, I would like to deserialize the custom objects into FirebaseFirestore.DocumentDatas.

Can I use this library with cloud functions? would it help with this mission? I am somewhat of a noob with web technologies and backend. So please help me out.

This explains the issue in greater detail. with code:
Also before coming up with this library, I asked a question in SO: Cloud Functions(TypeScript) - How to use custom Models instead of nested maps/dictionaries. If I can solve it with this, It would be nice to have an answer in SO so others can see this library.

[frankps]

I'm using the combination (Firebase functions/class-transformer), therefore I have written the helper class below. Hope this helps you!

import * as admin from 'firebase-admin';
import * as functions from 'firebase-functions';
import { plainToClass } from 'class-transformer';


export class PlatformHelper {

    /** Dates coming from firestore are already of type 'Timestamp', plainToClass() from 'class-transformer' is throwing an exception on these Timestamps, therefor we need to convert Timestamp's to 
     * Javascript Date's before calling plainToClass()
     */
    static convertTimestampToDate(obj: any) {

        if (!obj)
            return obj

        Object.keys(obj).forEach(key => {

            let value = obj[key]

            if (value) {

                if (value instanceof admin.firestore.Timestamp) {
                    obj[key] = obj[key].toDate()
                } else if (value instanceof Object) {
                    this.convertTimestampToDate(value)
                }

            }

        })
    }

    static snapshotToType<T>(snapshot: functions.firestore.DocumentSnapshot, type: { new(): T; }): T {

        if (!snapshot) return null

        let obj = snapshot.data()

        if (!obj) return null

        obj.id = snapshot.id

        PlatformHelper.convertTimestampToDate(obj)

        console.log(obj)

        let typed = plainToClass(type, obj);

        return typed
    }


    static querySnapshotToArray<T>(snapshot: FirebaseFirestore.QuerySnapshot<FirebaseFirestore.DocumentData>, type: { new(): T; }): T[] {

        if (!snapshot || !snapshot.docs) return []

        return snapshot.docs.map(doc => PlatformHelper.snapshotToType<T>(doc, type))
    }


    static snapshotToObject(snapshot: functions.firestore.DocumentSnapshot): any {

        let obj = snapshot.data()
        obj.id = snapshot.id

        PlatformHelper.convertTimestampToDate(obj)

        return obj
    }



}

[frankps]

Thx Lorenzo: I check it out!!

[NoNameProvided]

I am not familiar with Firebase, but generally, you should be able to use it.

I am closing this issue as solved by @frankps. If this is not the case feel free to comment and I will reopen.

[github-actions]

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