Module: Transformers::Extensions::Hash

Defined in:
lib/transformers/extensions/hash.rb

Instance Method Summary collapse

Instance Method Details

#convert(*keys) ⇒ Object 



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# File 'lib/transformers/extensions/hash.rb', line 12

def convert(*keys)
  options = keys.extract_options!
  return unless keys.any? { |key| self.has_key?(key) }
  new_key = options[:as] || keys.first
  converter = options[:to]
  values = keys.collect { |key| delete(key) }
  new_value = converter ? Transformers.get(converter).call(*values) : (values.length == 1 ? values.first : values)
  self[new_key] = new_value
end

#copy(key, options = {}) ⇒ Object

Raises:



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# File 'lib/transformers/extensions/hash.rb', line 28

def copy(key, options = {})
  new_key = options[:to]
  raise MissingOption.new(:to) if new_key.nil?
  self[new_key] = self[key]
end

#rename(key, options = {}) ⇒ Object

Raises:



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# File 'lib/transformers/extensions/hash.rb', line 22

def rename(key, options = {})
  new_key = options[:to]
  raise MissingOption.new(:to) if new_key.nil?
  self[new_key] = self.delete(key)
end

#transform(key = nil, &block) ⇒ Object 



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# File 'lib/transformers/extensions/hash.rb', line 4

def transform(key = nil, &block)
  target = key.nil? ? self : self[key]
  if target
    raise TypeError.new("Can't apply transformations on #{target.inspect}. Expected a Hash") unless target.is_a?(Hash)
    target.instance_eval(&block)
  end
end