Method: Hashdiff.patch!

Defined in:
lib/hashdiff/patch.rb

.patch!(obj, changes, options = {}) ⇒ Object

Apply patch to object

Parameters:

  • obj (Hash, Array) —

    the object to be patched, can be an Array or a Hash

  • changes (Array) —

    e.g. [[ ‘+’, ‘a.b’, ‘45’ ], [ ‘-’, ‘a.c’, ‘5’ ], [ ‘~’, ‘a.x’, ‘45’, ‘63’]]

  • options (Hash) (defaults to: {}) —

    supports following keys:

    • :delimiter (String) [‘.’] delimiter string for representing nested keys in changes array

Returns:

  • the object after patch

Since:

  • 0.0.1



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# File 'lib/hashdiff/patch.rb', line 17

def self.patch!(obj, changes, options = {})
  delimiter = options[:delimiter] || '.'

  changes.each do |change|
    parts = change[1]
    parts = decode_property_path(parts, delimiter) unless parts.is_a?(Array)

    last_part = parts.last

    parent_node = node(obj, parts[0, parts.size - 1])

    if change[0] == '+'
      if parent_node.is_a?(Array)
        parent_node.insert(last_part, change[2])
      else
        parent_node[last_part] = change[2]
      end
    elsif change[0] == '-'
      if parent_node.is_a?(Array)
        parent_node.delete_at(last_part)
      else
        parent_node.delete(last_part)
      end
    elsif change[0] == '~'
      parent_node[last_part] = change[3]
    end
  end

  obj
end