update map of map in dart to firestore

Question

User can save his name and photo. Users can skip to upload a profile photo. So, I already store users' data inside my DB. So, I didn't want to set null into photo.url. How do I create a map for this?

Future<void> updateUser({String name, String uid, String url}) { Map<String, dynamic> _map = <String, dynamic>{ 'info': { 'name': name }, }; if (url != null) { // if user upload profile photo I want to add url to inside `info.photo` // got an error when try like this // _map['info']['photo'] = {'url': url}; // this way is replace info, it's mean 'name' key is removed // _map['info'] = { // 'photo': {'url': url} // }; } return _db.collection('users').doc(uid).set(_map, SetOptions(merge: true));

The final map should be like this,

{ 'info':{ 'name':name, 'photo':{ // if url is not null 'url':url } }

}

Joseph Utulu · Accepted Answer · 2020-09-30 17:35:18Z

2

You can try this:

 Map<String, dynamic> child = <String, dynamic>{'name': 'name'}; Map<String, dynamic> _map = <String, dynamic>{"info": child}; Map<String, dynamic> info = _map["info"]; info.update( 'photo', (value) => null, ifAbsent: () => {'url': 'new url'}, ); _map.update('info', (value) => info); print(_map);

I used a child map to enforce the type casting.

edited Sep 30, 2020 at 17:35

answered Sep 30, 2020 at 17:06

Joseph Utulu

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6 Comments

BIS Tech Over a year ago

wrong bro. please check my question. I want to add url inside an another map(photo)

Joseph Utulu Over a year ago

Yea, I saw what you did, but you get the idea. Well done.

BIS Tech Over a year ago

Sorry, it' wrong. I want to add photo map inside the info the map

BIS Tech Over a year ago

your result is like this {name: name, photo: {url: new url}}. I want {'info': {'name':name, 'photo':{'url':url}}

BIS Tech Over a year ago

yes. it's working. but I actual map is very complcated. there are so many conditions. Is there any amother way to do it?

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BIS Tech · Accepted Answer · 2020-10-07 12:30:10Z

You can do it easily using if

 Map<String, dynamic> _map = <String, dynamic>{ 'info': { 'name': name, if (url != null) 'photo' : {'url': url} }, };

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