Module: Polaroid::ClassMethods

Defined in:
lib/polaroid.rb

Instance Method Summary collapse

Instance Method Details

#build_from_snapshot(snapshot, format = :auto) ⇒ Object

This method will try its damnedest to give you a meaningful snapshot object, but first it needs to somehow get it into a Hash. Either you can let it autodetect and give it a Hash-like, JSON String-like, or something which responds to #to_h or #to_s, or you can explicitly pass it the format as :hash or :json.



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# File 'lib/polaroid.rb', line 40

def build_from_snapshot(snapshot, format = :auto)
  symbolize_keys  = ->((key, val), hash) { hash[key.to_sym] = val }
  from_hash       = ->(snap) { snap.each.with_object({}, &symbolize_keys) }
  from_json       = ->(snap) { JSON.parse(snap).each.with_object({}, &symbolize_keys) }
  snapshot_hash   =
    if    :auto == format && snapshot.is_a?(Hash)
      from_hash.call(snapshot)
    elsif :auto == format && snapshot.is_a?(String)
      from_json.call(snapshot)
    elsif :hash == format
      from_hash.call(snapshot)
    elsif :json == format
      from_json.call(snapshot)
    elsif snapshot.respond_to?(:to_h)
      from_hash.call(snapshot)
    else
      from_json.call(snapshot.to_s)
    end
  self::Snapshot.new(snapshot_hash)
end