Dynamic size report invoice odoo

size.py

  """
    Dynamic size in account_invoice report
    Just send the account_invoice_line_id take the len() and multiply it with 7 (millimeters)
    This example is simulating the paper of a supermarket invoice, the default size in my country is 24 millimeters for a correct
    format, but you can change it!
    
    How it works: You need pass this method inside the qweb report sending the lines.
  """ 
  #Qweb
  <t t-esc="o.change_size_page(o.lines)"/>
  
  #account_invoice.py
  def change_size_page(self, items):
        paper_format = self.env['report.paperformat'].search([('{name or id}', '=', '{name of the paper format or the id}')])
        if len(items) > 10:
            paper_format.page_height = 240 + (len(items) * 7)