Deleting Single Object

Method

Using Map

Future<int> Backendless.data.of("TABLE-NAME").remove({Map entity, String whereClause});

Custom Class

Future<int> Backendless.data.withClass<E>().remove({E entity, String whereClause});

where:

Argument	Description
TABLE-NAME	Name of the table where the object represented by Map will be deleted from. There must be objectId property in the map. The value of the property identifies the object which will be deleted.
E	Dart class of the data object to delete.
entity	Dart object to delete. Must contain the objectId property which identifies the object in the database.

Return Value

The timestamp when the server-side removed the object from the data store.

Example

• Using Map
• Custom Class

void deleteContact() {
  Map contact = {
    "name": "Jack Daniels",
    "age": 147,
    "phone": "777-777-777",
    "title": "Favorites",
  };

  Backendless.data.of("Contact").save(contact).then((savedContact) {
    // now delete the saved object
    Backendless.data.of("Contact").remove(entity: savedContact);
  });
}

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

  Backendless.data.withClass<Contact>().save(contact).then((savedContact) {
    // now delete the saved object
    Backendless.data.withClass<Contact>().remove(entity: savedContact);
  });
}