CODEWITHSUNDEEP
javascript
Jonas
Jonas

Reputation: 7885

JavaScript function return Object as JSON

In need to add an Object to my Firestore database. It only takes JSON objects. However I also want to exclude some fields of my object to not get send to my database.

So I added a function that should return a JSON like this:

export class Entry {

date: number;
timeStart: number;
timeEnd: number;
entry: EntryData;

// To be excluded from database
selected: boolean;

constructor(date: number, timeStart: number, timeEnd: number, entry: EntryData) {
    this.date = date;
    this.timeStart = timeStart;
    this.timeEnd = timeEnd;
    this.entry = entry;
}

toJSON() {
    return {date: this.date, timeStart: this.timeStart, timeEnd: this.timeEnd, entry: JSON.parse(JSON.stringify(this.entry)) };
}
}

However when I do console.log(entry.toJSON()) I get this:

workday.service.ts:122 ƒ () {
        return { date: this.date, timeStart: this.timeStart, timeEnd: this.timeEnd, entry: JSON.parse(JSON.stringify(this.entry)) };
    }

I want to use the function like this:

this.employeeRef.collection('Entries').add(entry.toJSON);

But that doesn't work. It works like this:

    this.employeeRef.collection('Entries').add(JSON.parse(JSON.stringify(entry)));

But this way the selected field is not excluded from the database.

Any Ideas? Note that I'm using TypeScript (with Angular) but I think thats a pure JavaScript problem.

Upvotes: 0

Views: 117

Answers (2)

Jonas
Jonas

Reputation: 7885

This seems to work:

toJSON() {
    return {date: this.date, timeStart: this.timeStart, timeEnd: this.timeEnd, entry: JSON.parse(JSON.stringify(this.entry)) };
}

I can use it like this:

his.employeeRef.collection('Entries').add(entry.toJSON());

Upvotes: 0

Jonas Wilms
Jonas Wilms

Reputation: 138297

You probably want to use a getter:

 get toJSON() {
   return {date: this.date, timeStart: this.timeStart, timeEnd: this.timeEnd, entry: JSON.parse(JSON.stringify(this.entry)) };
 }

Upvotes: 1

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