Reprocess sale when deleting invoice lines

issue6131
review31821002

invoice.py

@@ -156,3 +156,16 @@ class InvoiceLine:
         models = super(InvoiceLine, cls)._get_origin()
         models.append('sale.line')
         return models
+
+    @classmethod
+    def delete(cls, lines):
+        pool = Pool()
+        Sale = pool.get('sale.sale')
+        with Transaction().set_context(_check_access=False):
+            lines = cls.browse(lines)
+            invoices = (l.invoice for l in lines
+                if l.type == 'line' and l.invoice)
+            sales = [s for i in invoices for s in i.sales]
+        super(InvoiceLine, cls).delete(lines)
+        with Transaction().set_context(_check_access=False):
+            Sale.process(sales)

tests/scenario_sale.rst

@@ -697,3 +697,25 @@ invoices::
     5.0
     >>> stock_move.state
     u'draft'
+
+Deleting a line from a invoice should recreate it::
+
+    >>> sale = Sale()
+    >>> sale.party = customer
+    >>> line = sale.lines.new()
+    >>> line.product = product
+    >>> line.quantity = 10.0
+    >>> sale.click('quote')
+    >>> sale.click('confirm')
+    >>> sale.click('process')
+    >>> invoice, = sale.invoices
+    >>> config.user = account_user.id
+    >>> invoice_line, = invoice.lines
+    >>> invoice.lines.remove(invoice_line)
+    >>> invoice.click('post')
+    >>> config.user = sale_user.id
+    >>> sale.reload()
+    >>> new_invoice, = sale.invoices
+    >>> new_invoice.number
+    >>> len(new_invoice.lines)
+    1