A module that can be used to transform the keys and values for a subset of pairs in a hash.

example.rb

class FruitImporter
  include HashRemapper

  remaps 'fruit_name',   to: :name
  remaps 'id',           to: :fruit_store_id
  remaps 'coordinates',  to: :coordinates_x, value: ->(c) { c[0].to_f if c}
  remaps 'coordinates',  to: :coordinates_y, value: ->(c) { c[1].to_f if c}
  
  def import(fruit_hash)
    Fruit.create(remap(fruit_hash))
  end
end

hash_remapper.rb

module HashRemapper
  def self.included(base)
    base.extend(ClassMethods)
  end

  def remap(old_hash)
    new_hash = old_hash.dup
    self.class.mappings.each do |from, params|
      to    = params.fetch(:to)    { from }
      using = params.fetch(:value) { ->(x) {x} }
      val   = old_hash.fetch(from)
      new_hash.delete(from)
      new_hash[to] = using.call(val)
    end
    new_hash
  end

  module ClassMethods

    def mappings
      @mappings ||= {}
    end

    def remaps(a, params)
      self.mappings.merge!({a => params})
    end

  end

end