Transproc

Functional transformations for Ruby. It's currently used as one of the data mapping backends in Ruby Object Mapper.

Installation

Add this line to your application's Gemfile:

gem 'transproc'

And then execute:

$ bundle

Or install it yourself as:

$ gem install transproc

Usage

require 'transproc/all'

# compose transformation functions
include Transproc::Helper

transformation = t(:map_array, t(:symbolize_keys) >> t(:rename_keys, user_name: :user))
transformation >>= t(:wrap, :address, [:city, :street, :zipcode])

# call the function
transformation.call(
  [
    { 'user_name' => 'Jane',
      'city' => 'NYC',
      'street' => 'Street 1',
      'zipcode' => '123' }
  ]
)
# => [{:user=>"Jane", :address=>{:city=>"NYC", :street=>"Street 1", :zipcode=>"123"}}]

# Define your own transformations easily
Transproc(:to_json, -> v { JSON.dump(v) })

Transproc(:to_json).call([{ name: 'Jane' }])
# => "[{\"name\":\"Jane\"}]"

# ...or create a module with custom transformations
module MyTransformations
  extend Transproc::Functions

  def load_json(v)
    JSON.load(v)
  end
end

(Transproc(:load_json) >> Transproc(:symbolize_keys)).call('[{"name":"Jane"}]')
# => [{ :name => "Jane" }]

Credits

This project is inspired by the work of following people:

• Markus Schirp and morpher project
• Josep M. Bach and kleisli project

Contributing

1. Fork it ( https://github.com/solnic/transproc/fork )
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request