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RelationHelper
The RelationHelper is a helper that allows you to select a list of models coming from a specific relationship on a specific entity.
fromRelation
The RelationHelper class provides a static method fromRelation that takes a model instance, a model id and a relation name. It will return a list of models that are related to the given model via the provided relation.
php
<?php
$models = RelationHelper::fromRelation(User::class, 1, 'posts');The code above will return a list of posts that are related to the user with the id 1 via the posts relation.
notFromRelation
The RelationHelper class also provides a static method notFromRelation that takes a model instance, a model id and a relation name. It will return a list of models that are not related to the given model via the provided relation.
php
<?php
$models = RelationHelper::notFromRelation(User::class, 1, 'posts');The code above will return a list of posts that are not related to the user with the id 1 via the posts relation.
Review
The RelationHelper class is a powerful tool that allows you to easily fetch related models from a specific entity.
It's used in RelationAddDialog to fetch related model entities that are not yet attached to the current entity.