Finds the sum of some ManagedObject property.
selector
identifies the property being evaluated, e.g.
var query = new Query<User>();
var yearsLivesByAllUsers = await query.reduce.sum((user) => user.age);
The property must be an attribute and its type must be an num
, i.e. int
or double
.
Source
Future<U> sum<U extends num>(U selector(T object));