QueryProxyMethods

methods used to resolve association dependencies

Constants

Files

• lib/neo4j/active_node/dependent/query_proxy_methods.rb:5

Methods

#each_for_destruction

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.

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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

#unique_nodes

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.

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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