Class: Neo4j::Core::Traversal::CypherQuery

Inherits:

Object

• Object
• Neo4j::Core::Traversal::CypherQuery

show all

Includes:

Enumerable

Defined in:

lib/neo4j-core/traversal/traverser.rb

Instance Attribute Summary (collapse)

• - (Object) query

  Returns the value of attribute query.

• - (Object) return_variable

  Returns the value of attribute return_variable.

Instance Method Summary (collapse)

• - (Object) each
• - (CypherQuery) initialize(start_id, dir, types, query_hash = nil, &block) constructor

  A new instance of CypherQuery.

• - (Object) to_s

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# File 'lib/neo4j-core/traversal/traverser.rb', line 9

def initialize(start_id, dir, types, query_hash=nil, &block)
  q = Neo4j::Cypher.query do
    n = node(start_id)
    next_nodes = case dir
                   when :outgoing then
                     n.outgoing(types)
                   when :incoming then
                     n.incoming(types)
                   when :both then
                     n.both(types)
                 end
    if block
      self.instance_exec(next_nodes, &block)
    else
      query_hash.each{|pair|  next_nodes[pair[0]] == pair[1]}.to_a  if query_hash
      next_nodes
    end
  end

  @query = q.to_s
  self.return_variable=q.return_names.last
end

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# File 'lib/neo4j-core/traversal/traverser.rb', line 7

def query
  @query
end

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# File 'lib/neo4j-core/traversal/traverser.rb', line 7

def return_variable
  @return_variable
end

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# File 'lib/neo4j-core/traversal/traverser.rb', line 36

def each
  Neo4j._query(to_s).each do |r|
    yield r[return_variable]
  end
end

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# File 'lib/neo4j-core/traversal/traverser.rb', line 32

def to_s
  @query.to_s
end