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Two way data mapping
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 Dependencies

Development

>= 0
~> 3.0

Runtime

 Project Readme

Two Way Mapper Build Status

Two way data mapping

Installation

Add this line to your application's Gemfile:

gem 'two-way-mapper'

And then execute:

$ bundle

Or install it yourself as:

$ gem install two-way-mapper

Usage

First, we need to define mapping

TwoWayMapper.register :customer do |mapping|
  mapping.left :object # set left plugin to object
  mapping.right :hash, stringify_keys: true # set right plugin to hash

  # define transformation rules
  mapping.rule 'first_name', 'FirstName'
  mapping.rule 'last_name', 'LastName'
  mapping.rule 'gender', 'sex',
    map: {
      'M' => 'male',
      'F' => 'female'
    }, default: ''
end

For simple rules use

TwoWayMapper.register :customer do |mapping|
  mapping.left :object # set left plugin to object
  mapping.right :hash, stringify_keys: true # set right plugin to hash

  mapping.rules(
    'first_name' => 'FirstName',
    'last_name' => 'LastName'
  )
end

Mapping can be defined explicitly without registration

mapping = TwoWayMapper::Mapping.new
mapping.left :object
mapping.right :hash, stringify_keys: true
# ...

Once the mapping is defined it can be used to convert one object to another and vice versa

Customer = Struct.new :first_name, :last_name, :gender

customer = Customer.new
api_response = { 'FirstName' => 'Evee', 'LastName' => 'Fjord', 'sex' => 'female' }

TwoWayMapper[:customer].from_right_to_left(customer, api_response)
puts customer.first_name # => 'Evee'
puts customer.last_name # => 'Fjord'
puts customer.gender # => 'F'

request_data = {}

another_customer = Customer.new
another_customer.first_name = 'Step'
another_customer.last_name = 'Bander'
another_customer.gender = 'M'

TwoWayMapper[:customer].from_left_to_right(another_customer, request_data)
puts request_data # => { 'FirstName' => 'Step', 'LastName' => 'Bander', sex: 'male' }

In rails, mappings can be defined in app/mappings folder

Available plugins

  • hash
  • object
  • active_record (same as object, but for keys like user.email, it builds user before updating email on write)

Contributing

  1. Fork it
  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 new Pull Request