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selective_ivars_with_marshal_dump

🔁 Selective Serialization of Instance Variables​

Use marshal_dump and marshal_load to include only essential instance variables, skipping caches or transient state. This leads to leaner dumps and avoids serializing sensitive or bulky data.

class Config
  def initialize(params)
    @params = params
    @cache  = compute_cache(params)
  end

  # Only serialize @params, skip @cache
  def marshal_dump
    @params
  end

  def marshal_load(data)
    @params = data
    # Reconstruct transient cache after loading
    @cache = compute_cache(@params)
  end

  private

  def compute_cache(params)
    # expensive computation
    params.values.sum
  end
end

# Usage:
cfg = Config.new(foo: 1, bar: 2)
data = Marshal.dump(cfg)
new_cfg = Marshal.load(data)