Transmap

A simple library for serializing and deserializing hashes into objects and vice-versa

Installation

Add this line to your application's Gemfile:

gem 'transmap'

And then execute:

$ bundle

Or install it yourself as:

$ gem install transmap

Usage

To set up the logger

Transmap.configure do |config|
  config.logger = Logger.new(STDOUT)
end

How to use the Mappers

for simple mappings

class Window
  include Transmap::Mappers
 
  simple_map id: :windowId,
             is_exclusive: :exclusive
 
end

obj = Window.from_hash({windowId: 1, exclusive: true})
obj.id #-> 1
obj.is_exclusive #-> true
obj.to_hash #-> {windowId: 1, exclusive: true}

for transformation mappings

class Window
  include Transmap::Mappers
 
  transform_map :start_on, :epochStart, 
        to: :datetime_to_epoch, from: :epoch_to_datetime

  def self.epoch_to_datetime(milliseconds)
    Time.at(milliseconds/1000).to_datetime if milliseconds.present?
  end
 
  def self.datetime_to_epoch(datetime)
    datetime.to_i * 1000 if datetime.present?
  end
 
end

obj = Window.from_hash({epochStart: 1516499650000})
obj.start_on #-> Saturday, January 20, 2018 5:54:10 PM GMT-08:00
obj.to_hash #-> {epochStart: 1516499650000}

Development

To execute the tests

bundle install
rspec