class ViewModel::ActiveRecord::UpdateOperation

def build!(update_context)
  raise ViewModel::DeserializationError::Internal.new('Internal error: UpdateOperation cannot build a deferred update') if viewmodel.nil?
  return self if built?
  update_data.associations.each do |association_name, association_update_data|
    association_data = self.viewmodel.class._association_data(association_name)
    update =
      if association_data.collection?
        build_updates_for_collection_association(association_data, association_update_data, update_context)
      else
        build_update_for_single_association(association_data, association_update_data, update_context)
      end
    add_update(association_data, update)
  end
  update_data.referenced_associations.each do |association_name, reference_string|
    association_data = self.viewmodel.class._association_data(association_name)
    update =
      if association_data.through?
        build_updates_for_collection_referenced_association(association_data, reference_string, update_context)
      elsif association_data.collection?
        build_updates_for_collection_association(association_data, reference_string, update_context)
      else
        build_update_for_single_association(association_data, reference_string, update_context)
      end
    add_update(association_data, update)
  end
  @built = true
  self
end