Multiple params assignment and dates with multiparams

1ST README.md

Simple class multiassignment

Module to use similar model multiple params assignment and dates with multiparams (params["date(1i)"], params["date(2i)"], params["date(3i)"]) in a non ActiveModel class.

class Sample
  include ActiveModel::Multiassignment

  attr_accessor :name, :date
  multiparameter_dates :date
end

params[:sample] = {
  "name" => "John Doe",
  "date(1i)" => 2000,
  "date(2i)" => 1,
  "date(3i)" => 1
}

sample = Sample.new params[:sample]
=> #<Sample:0x007fdf19b4cb70 @date=Sat, 01 Jan 2000, @name="John Doe">

multiassignment.rb

module ActiveModel
  module Multiassignment
    extend ActiveSupport::Concern
    include ActiveModel::MultiparameterDates

    def initialize(new_attributes = {})
      multiassign_attributes new_attributes
    end

    def multiassign_attributes new_attributes
      return unless new_attributes.is_a?(Hash)
      self.class.parse_multiparameter_dates new_attributes
      new_attributes.each do |name, value|
        send("#{name}=", value)
      end
    end

  end
end

multiparameter_dates.rb

module ActiveModel
  module MultiparameterDates
    extend ActiveSupport::Concern

    module ClassMethods

      def multiparameter_dates *date_fields
        @date_fields = date_fields
      end

      def parse_multiparameter_dates attributes
        @date_fields.each do |field|
          date_keys = ["#{field}(1i)", "#{field}(2i)", "#{field}(3i)"]
          if (date_keys - attributes.keys).empty?
            date_values = date_keys.map { |key| attributes.delete(key).to_i }
            attributes[field] = Date.civil(*date_values)
          end
          attributes[field] = attributes[field].to_date if attributes[field].kind_of? String
        end unless @date_fields.blank?
        attributes
      end

    end
  end
end