/**
* Validate and discover all the relationships on a model.
*
* @return Relation[]
*/
protected function discoverRelations()
{
if ($this->relations === null) {
$this->relations = [];
Std::each(function ($name) {
// Check that the relationship method is there.
if (!method_exists($this->model, $name)) {
throw new LackOfCoffeeException(vsprintf('The model declares a relationship named "%s" but' . ' there is no method with that name.', [$name]));
}
$relationReflector = new ReflectionMethod($this->model, $name);
if (!$relationReflector->isPublic()) {
throw new LackOfCoffeeException(vsprintf('The method for the relationship named "%s" should' . ' be public.', [$name]));
}
$argumentCount = $relationReflector->getNumberOfParameters();
if ($argumentCount > 0) {
throw new LackOfCoffeeException(vsprintf('The method for the relationship named "%s" should' . ' take 0 arguments. However, it requires %d.', [$name, $argumentCount]));
}
$relation = $this->model->{$name}();
if (!$relation instanceof Relation) {
throw new LackOfCoffeeException(vsprintf('The method for the relationship named "%s" should' . ' return an instance of %s. Got %s.', [$name, Relation::class, TypeHound::fetch($relation)]));
}
$this->relations[$name] = $relation;
}, $this->model->getRelated());
}
return $this->relations;
}
