Class: Factbase::IndexedEq

Inherits:
Object
  • Object
show all
Defined in:
lib/factbase/indexed/indexed_eq.rb

Overview

Indexed term ‘eq’.

Instance Method Summary collapse

Constructor Details

#initialize(term, idx) ⇒ IndexedEq

Returns a new instance of IndexedEq.



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# File 'lib/factbase/indexed/indexed_eq.rb', line 8

def initialize(term, idx)
  @term = term
  @idx = idx
end

Instance Method Details

#predict(maps, _fb, params) ⇒ Object 



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# File 'lib/factbase/indexed/indexed_eq.rb', line 13

def predict(maps, _fb, params)
  first_operand = @term.operands[0]
  second_operand = @term.operands[1]
  return unless first_operand.is_a?(Symbol) && _scalar?(second_operand)
  first_operand = first_operand.to_s
  key = [maps.object_id, first_operand, @term.op]
  @idx[key] ||= { facts: {}, count: 0 }
  entry = @idx[key]
  _feed(maps.to_a, entry, first_operand)
  keys = _resolve(second_operand, params)
  matches = keys.flat_map { |k| entry[:facts][k] || [] }
  matches = matches.uniq(&:object_id) if keys.size > 1
  maps.respond_to?(:repack) ? maps.repack(matches) : matches
end