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)
  return nil if @idx.nil?
  key = [maps.object_id, @term.operands.first, @term.op]
  return unless @term.operands.first.is_a?(Symbol) && _scalar?(@term.operands[1])
  entry = @idx[key]
  maps_array = maps.to_a
  if entry.nil?
    entry = { index: {}, indexed_count: 0 }
    @idx[key] = entry
  end
  if entry[:indexed_count] < maps_array.size
    prop = @term.operands.first.to_s
    maps_array[entry[:indexed_count]..].each do |m|
      m[prop]&.each do |v|
        entry[:index][v] ||= []
        entry[:index][v] << m
      end
    end
    entry[:indexed_count] = maps_array.size
  end
  vv =
    if @term.operands[1].is_a?(Symbol)
      params[@term.operands[1].to_s] || []
    else
      [@term.operands[1]]
    end
  j = vv.flat_map { |v| entry[:index][v] || [] }.uniq(&:object_id)
  if maps.respond_to?(:inserted)
    Factbase::Taped.new(j, inserted: maps.inserted, deleted: maps.deleted, added: maps.added)
  else
    j
  end
end