begin method
Begins a transaction
Implementation
Future<Map<dynamic, dynamic>?> begin(dynamic collections) async {
var request =
client.prepareRequest('/_api/transaction/begin', methode: 'post');
request.body = collections;
Map<dynamic, dynamic> doc;
try {
doc = await client.exec(request);
return doc['result']; // return id and status of the transaction
} catch (e) {
print(e);
}
return null;
}