the number of (unique) elements in Set.
Returns an array that lists every model, sorted in order of foreign key references: The first model is a model that is depended upon, the last model is a model that is not depended upon.
If there is a cyclic dependency, this returns null.
Returns the list of registered model names.
a boolean indicating whether an element with the specified value exists in the Set or not.
Returns an array that lists every model, sorted in order of foreign key references: The first model is a model that is depended upon, the last model is a model that is not depended upon.
If there is a cyclic dependency, this returns null.