Class: BaseTransmogrifier

Inherits:
Object
  • Object
show all
Defined in:
lib/base_transmogrifier.rb

Overview

BaseTransmogrifier holds shared code for the transmogrifier classes

Class Method Summary collapse

Class Method Details

.inject_value(hash, key_grams, value, original_key) ⇒ Object 



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# File 'lib/base_transmogrifier.rb', line 3

def self.inject_value(hash, key_grams, value, original_key)
  # if we only have 1 gram, we can set the value
  if key_grams.size == 1
    # If the new value is nil, and the old value was a hash, it's because
    # somebody didn't provide a full default value; ignore it.
    unless value.nil? && hash[key_grams[0]].is_a?(Hash)
      hash[key_grams[0]] = value
    end
    return
  end

  # if there's more than one gram, keep going

  # Initialize a hash if we're going deeper than what's currently available;
  # sometimes we want to override when the old value is nil (i.e. no default)
  # but the new value is a hash.
  hash[key_grams[0]] = {} if hash[key_grams[0]].nil?
  # error out if we're trying to override
  # an existing value that's not a hash
  unless hash[key_grams[0]].is_a?(Hash)
    raise NonHashValueOverride, \
          "Refusing to override non-hash value #{hash[key_grams[0]].inspect} " \
          "with #{value.inspect}: '#{key_grams.join('.')}'" \
          " - Complete key: '#{original_key}'"
  end
  # keep going deeper
  inject_value(hash[key_grams[0]], key_grams.drop(1), value, original_key)
end