example_transfer.rb

class Product
  belongs_to :course
end

class Variant
  belongs_to :course
end

class InventoryOrder
  def process
    order.line_items.each do |line_item|
      generic_course = line_item.product.course
      variant_course = line_item.variant.course || generic_course
      
      # Find all units for distributor based on the generic product
      OleCore::Unit.active.not_expired
                   .where(course_id: generic_course.id, account_id: from_account.id)
                   .limit(qty)
                   .update_all(
                     account_id: to_account.id
                     course_id: variant_course.id
                   )
    
    end
 
  end
end