flutter list to nested json manually

Question

I have a contact list, where I would like to send the givenName, familyName and displayName to an api using json string..

final contacts =
    (await ContactsService.getContacts(withThumbnails: false)).toList();

I tried but unable to created nested array:

List<dynamic> list = new List<dynamic>();

for (final contact in contacts) {
    list.add(contact.givenName);
}

print(list);

I would like it something like:

[
    {"id":1,"givenName":"Joe","familyname":"Walker"},
    {"id":2,"givenName":"Zoe","familyname":"Sleeper"}
];

Can you share contacts list which comes from ContactsService? — Nikhil Vadoliya
– Nikhil Vadoliya, Commented Aug 4, 2020 at 10:30

towhid · Accepted Answer · 2020-08-05 21:37:43Z

1

Updated try this one

for (final contact in contacts) {
     var json = {'givenName' : contact.givenName, 'familyName': contact.familyName};
     list.add(json);
 }

OLD

Your Contact class should have a toJson method to do this.

class Contact {
   Int id;
  String givenName, familyName;

  Map<String, dynamic> toJson() =>
  {
    'id': id,
    'givenName' : givenName, 
    'familyName': familyName,
  }; 
}

Now your code should work

List<dynamic> list = new List<dynamic>();

for (final contact in contacts) {
    list.add(contact.toJson());
}

print(list);

edited Aug 5, 2020 at 21:37

answered Aug 4, 2020 at 12:58

towhid

3,3088 gold badges20 silver badges31 bronze badges

Sign up to request clarification or add additional context in comments.

4 Comments

aknd Over a year ago

I am getting errors is it possible class Contact is conflicts with pub.dev/packages/contacts_service package as thats also uses Contact ?

aknd Over a year ago

gist.github.com/andraskende/24a26b98fea68424557bad6f34641ea4 the error message is commented, Thank you !

towhid Over a year ago

try this one

for (final contact in contacts) {     var json = {'givenName' : contact.givenName, 'familyName': contact.familyName};     list.add(json); }

aknd Over a year ago

Perfect! Thank You !!

Collectives™ on Stack Overflow

flutter list to nested json manually

1 Answer 1

4 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

4 Comments

Your Answer

Sign up or log in

Post as a guest

Related