Module: Mongoid::Denormalize::ClassMethods

Defined in:
lib/mongoid-denormalize.rb

Instance Method Summary collapse

Instance Method Details

#denormalize(*args) ⇒ Object 



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# File 'lib/mongoid-denormalize.rb', line 10

def denormalize(*args)
  options = args.pop

  unless options.is_a?(Hash) && (from = options[:from]&.to_s)
    raise ArgumentError, 'Option :from is needed (e.g. delegate :name, from: :user).'
  end

  # Add fields to model
  args.each { |field| field "#{from}_#{field}" }

  # Denormalize fields when model is saved and 'from' has changed
  before_save do
    if send(from) && send("#{from}_id_changed?")
      args.each do |field|
        send("#{from}_#{field}=", send(from).send(field))
      end
    end
  end

  from_class = (relations[from].class_name || relations[from].name.capitalize).constantize
  child_model_name = model_name
  child_inverse_of = relations[from].inverse_of

  # When 'from' is updated, update child/childs
  from_class.send(:after_update) do
    attributes = {}
    args.each { |field| attributes["#{from}_#{field}"] = send(field) }

    relation = relations[child_inverse_of.to_s] ||
               relations[child_model_name.plural] ||
               relations[child_model_name.singular]

    unless relation
      raise "Option :inverse_of is needed for 'belongs_to :#{from}' into #{child_model_name.name}."
    end

    case relation.relation.to_s
    when 'Mongoid::Relations::Referenced::One'
      document = send(relation.name)
      document.collection.update_one({_id: document._id}, {'$set' => attributes}) if document
    when 'Mongoid::Relations::Referenced::Many'
      send(relation.name).update_all('$set' => attributes)
    else
      raise "Relation type unsupported: #{relation.relation}"
    end
  end
end