Updating Single Object¶

Method¶

Using MapCustom Class

Future<Map> Backendless.data.of("TABLE-NAME").save(Map entity);

Future<E> Backendless.data.withClass<E>().save(E entity);

where:

Argument	Description
`TABLE-NAME`	Name of the table where the object represented by Map will be updated. There must be `objectId` property in the map. The value of the property identifies the object which will be updated.
`E`	Dart class of the data object to update.
`entity`	Dart object to persist, must be of type E or Map (depending on the method used).

Return Value¶

The updated object of type E or Map.

Example¶

Using MapCustom Class

void updateContact() {
  // create new contact object first. Then we will update it.
  Map contact = {
    "name": "Jack Daniels",
    "age": 147,
    "phone": "777-777-777",
    "title": "Favorites",
  };

  Backendless.data.of("Contact").save(contact).then((savedContact) {
    savedContact["title"] = "Most favorite";
    savedContact["phone"] = "666-666-666";
    Backendless.data.of("Contact").save(savedContact).then((response) {
      // Contact object has been updated
    });
  });
}

Consider the following class:

import 'package:backendless_sdk/backendless_sdk.dart';

@reflector
class Contact {
  String objectId;
  String name;
  int age;
  String phone;
  String title;
}

The following code saves a new instance of the Contact class and subsequently updates it:

void updateContact() {
  Contact contact = Contact()
    ..name = "Jack Daniels"
    ..age = 147
    ..phone = "777-777-777"
    ..title = "Favorites";

  Backendless.data.withClass<Contact>().save(contact).then((savedContact) {
    // now update the saved object
    savedContact.title = "Most favorite";
    savedContact.phone = "666-666-666";
    Backendless.data.withClass<Contact>().save(savedContact).then((response) {
      // Contact instance has been updated
    });
  });
}