Method: Sohm::Model#refresh_indices

Defined in:
lib/sohm.rb

#refresh_indices ⇒ Object

Refresh model indices



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# File 'lib/sohm.rb', line 1115

def refresh_indices
  memo_key = key["_indices"]
  # Add new indices first
  commands = fetch_indices.each_pair.map do |field, vals|
    vals.map do |val|
      index_key = model.key["_indices"][field][val]
      [["SADD", memo_key, index_key], ["SADD", index_key, id]]
    end
  end.flatten(2)

  model.synchronize do
    commands.each do |command|
      redis.queue(*command)
    end
    redis.commit
  end

  # Remove old indices
  index_set = ::Set.new(redis.call("SMEMBERS", memo_key))
  # Here we are fetching the latest model to avoid concurrency issue
  valid_list = model[id].send(:fetch_indices).each_pair.map do |field, vals|
    vals.map do |val|
      model.key["_indices"][field][val]
    end
  end.flatten(1)
  valid_set = ::Set.new(valid_list)
  diff_set = index_set - valid_set
  if diff_set.size > 0
    diff_list = diff_set.to_a
    commands = diff_list.map do |key|
      ["SREM", key, id]
    end + [["SREM", memo_key] + diff_list]

    model.synchronize do
      commands.each do |command|
        redis.queue(*command)
      end
      redis.commit
    end
  end
  true
end