insert abstract method
Stores an item in the database but raises an error if the key already exists.
Note: The object to save must contain a key as parameter.
Example:
{
"key": "my-key",
"name": "Jhon Doe",
"age": 30
}
Throw DetaObjectException
if key already exists.
Implementation
Future<Map<String, dynamic>> insert(Object item, {String? key});