Sketching an ODT template generator

modello.rb

M::Document.configure do |config|
  config.placeholder_format = "%:placeholder%"
end

class CustomerDetails
  include M::DocumentFragment
  include ActionView::Helpers::NumberHelper

  subs :name, type: M::Text
  subs :last_name, type: M::Text
  subs :phone, type: M::Text

  def phone
    number_to_phone(@phone)
  end
end

class Document
  include M::Document

  document_template 'document_template.odt'
  document_name :document_name

  substitute :title # type: 'Text', with: 'title', placeholder: 'title'
  subs :gender,     type: M::Text,  with: 'gender'
  subs :invoices,   type: M::Table
  subs :tasks,      type: M::OrderedList
  subs :car_images, type: M::Image # self.car_images returns Enumerable
  subs :main_image, type: M::Image # self.main_image does not return an Enumerable
  subs :customer,   type: CustomerDetails, prefix: false

  def document_name
    "document_#{self.id}"
  end
end

doc = Document.new(gender: 'male', invoices: [Invoice.new], tasks: [Tasks.new], car_images: [Image.new])
doc.render # => generates XML
doc.package # => packages everything into an ODT file