Module: DeepStruct

Defined in:
lib/deep_struct.rb,
lib/deep_struct/version.rb

Overview

Mixin module for converter.

Constant Summary collapse

VERSION = 
"0.1.7"

Instance Method Summary collapse

Instance Method Details

#deep_struct(input) ⇒ Struct

Converts a Hash to a Struct. If the Hash has nested Hash objects, they are converted to Struct as well.

output = deep_struct({x: 1, y: {z: 2}})
output.x #=> 1
output.y.z #=> 2

Parameters:

  • input (Hash)

Returns:

  • (Struct) 


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# File 'lib/deep_struct.rb', line 13

def deep_struct(input)
  output = input.clone
  levels = output.keys.map { |key| [key, output] }
  levels.each do |key, context|
    if context[key].is_a?(Hash)
      # overwrite the shared reference with input by a new reference
      context[key] = context[key].clone
      subset = context[key]
      subset.each { |subkey, subvalue| levels.push([subkey, subset]) if subvalue.is_a?(Hash) }
    end
  end

  levels.reverse_each do |k, context|
    if context[k].is_a?(Hash)
      klass = Struct.new(*context[k].keys, keyword_init: true)
      context[k] = klass.new(context[k])
    end
  end

  klass = Struct.new(*output.keys, keyword_init: true)
  klass.new(output)
end