methods used to resolve association dependencies
Used as part of dependent: :destroy and may not have any utility otherwise. It keeps track of the node responsible for a cascading destroy process. but this is not always available, so we require it explicitly.
def each_for_destruction(owning_node) target = owning_node.called_by || owning_node objects = pluck(identity).compact.reject do |obj| target.dependent_children.include?(obj) end objects.each do |obj| obj.called_by = target target.dependent_children << obj yield obj end end
This will match nodes who only have a single relationship of a given type. It’s used by dependent: :delete_orphans and dependent: :destroy_orphans and may not have much utility otherwise.
def unique_nodes(association, self_identifer, other_node, other_rel) fail 'Only supported by in QueryProxy chains started by an instance' unless source_object return false if send(association.name).empty? unique_nodes_query(association, self_identifer, other_node, other_rel) .proxy_as(association.target_class, other_node) end