RelatedNode

A container for ActiveRel’s :inbound and :outbound methods. It provides lazy loading of nodes. It’s important (or maybe not really IMPORTANT, but at least worth mentioning) that calling method_missing will result in a query to load the node if the node is not already loaded.

• InvalidParameterError

Constants

Files

• lib/neo4j/active_rel/related_node.rb:5

Methods

#==

Loads the node if needed, then conducts comparison.

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def ==(other)
  loaded if @node.is_a?(Integer)
  @node == other
end

#class

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def class
  loaded.send(:class)
end

#initialize

ActiveRel’s related nodes can be initialized with nothing, an integer, or a fully wrapped node.

Initialization with nothing happens when a new, non-persisted ActiveRel object is first initialized.

Initialization with an integer happens when a relationship is loaded from the database. It loads using the ID because that is provided by the Cypher response and does not require an extra query.

Initialization with a node doesn’t appear to happen in the code. TODO: maybe find out why this is an option.

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def initialize(node = nil)
  @node = valid_node_param?(node) ? node : (fail InvalidParameterError, 'RelatedNode must be initialized with either a node ID or node')
end

#loaded

Loads a node from the database or returns the node if already laoded

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def loaded
  @node = @node.respond_to?(:neo_id) ? @node : Neo4j::Node.load(@node)
end

#loaded?

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def loaded?
  @node.respond_to?(:neo_id)
end

#method_missing

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def method_missing(*args, &block)
  loaded.send(*args, &block)
end

#neo_id

Returns the neo_id of a given node without loading.

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def neo_id
  loaded? ? @node.neo_id : @node
end

#respond_to_missing?

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def respond_to_missing?(method_name, include_private = false)
  loaded if @node.is_a?(Integer)
  @node.respond_to?(method_name) ? true : super
end