Module: HashExtensions

Included in:
Hash
Defined in:
lib/trax/core/ext/hash.rb

Instance Method Summary collapse

Instance Method Details

#assert_required_keys(*args) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/trax/core/ext/hash.rb', line 2

def assert_required_keys(*args)
  missing_args = args.reject{|arg| self.key?(arg) }
  raise ArgumentError.new("Missing keys: #{missing_args.join(', ')}") if missing_args.any?
  self
end

#to_transformer ⇒ Object

Returns selected keys, named or renamed as specified myproduct = => “something”, :price => “20” liability = myproduct.tap(&=> :price.to_transformer) liability == 20 Note: Tap only works where source is a hash object, so use as otherwise (because tap always returns the object you are tapping) myproduct = ::OpenStruct.new(=> “something”, :price => “20”) liability.as!(=> :price) liability == 20

Transforming values: Pass a hash as the value with the key being the source key/method myproduct = ::OpenStruct.new(=> “something”, :price => “20”) my_sale_product = myproduct.as!({:sale_price => {:price => ->(val){ val / 2 } } }) my_sale_product == 10



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# File 'lib/trax/core/ext/hash.rb', line 24

def to_transformer
  ->(hash_or_object) {
    new_hash = {}

    if hash_or_object.is_a?(::Hash)
      self.each_pair do |k,v|
        if v.is_a?(Hash)
          new_hash[k] = v.values.first.call(hash_or_object[v.keys.first])
        elsif v.is_a?(Proc)
          new_hash[k] = v.call(hash_or_object[k])
        else
          new_hash[k] = hash_or_object[v]
        end
      end

      hash_or_object.keys.map{ |k| hash_or_object.delete(k) }
      hash_or_object.merge!(new_hash)
    else
      self.each_pair do |k,v|
        if v.is_a?(Hash)
          new_hash[k] = v.values.first.call(hash_or_object.__send__(v.keys.first))
        elsif v.is_a?(Proc)
          new_hash[k] = v.call(hash_or_object.__send__(k))
        else
          new_hash[k] = hash_or_object.__send__(v)
        end
      end
    end

    return new_hash
  }
end