Class: Cyrel::Pattern::Relationship

Inherits:
Object
  • Object
show all
Includes:
ActiveModel::Attributes, ActiveModel::Model, Cyrel::Parameterizable
Defined in:
lib/cyrel/pattern/relationship.rb

Instance Method Summary collapse

Constructor Details

#initialize(types:, direction: Cyrel::Direction::BOTH, **kw) ⇒ Relationship

Returns a new instance of Relationship.



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# File 'lib/cyrel/pattern/relationship.rb', line 16

def initialize(types:, direction: Cyrel::Direction::BOTH, **kw)
  # Accept string or array for :types just like the old API
  super({ types: Array(types) }.merge(kw).merge(direction: direction))
end

Instance Method Details

#render(query) ⇒ Object 



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# File 'lib/cyrel/pattern/relationship.rb', line 21

def render(query)
  # For anonymous relationships (no alias, no types, no properties, no length)
  # we don't render brackets at all
  if alias_name.nil? && types.empty? && properties.empty? && length.nil?
    case direction
    in Direction::OUT  then '-->'
    in Direction::IN   then '<--'
    else '--'
    end
  else
    # Regular relationship with brackets
    core = +'['
    core << alias_name.to_s if alias_name
    core << ':' << Array(types).join('|') unless types.empty?
    core << length_spec
    core << " #{prop_string(query)}" unless properties.empty?
    core << ']'

    case direction
    in Direction::OUT  then "-#{core}->"
    in Direction::IN   then "<-#{core}-"
    else "-#{core}-"
    end
  end
end