I created a button that creates an invoice in the invoice module according to data from my Custom module

When I press the button, the data appears in the database, but does not appear in the view

What is the reason for that? 

my code :

    defcreate_invoice(self):
        vals={    
        'name':'samer',    
        'partner_id':self.vendor_id.id,   
         'invoice_date':date.today(),     
       'state':'draft',        
    'invoice_line_ids': [(0, 0, {    
            'price_unit': self.product_id.list_price,    
            'quantity': 1.0,           
     'discount': 0.0,               
 'product_id': self.product_id.name,  
          })]        }      
  self.update({           
 'state': '2',  
      })    
    return self.env['account.move'].create(vals)