rewrite function

subscription.py

@@ -10,9 +10,33 @@ class Subscription(metaclass=PoolMeta):
 
     include = fields.Boolean("Include", states={'readonly': Eval('state') != 'draft'})
 
-    def compute_next_invoice_date(self):
-        date = super(Subscription, self).compute_next_invoice_date()
-        if(self.include and not self.next_invoice_date):
-            return self.invoice_start_date or self.start_date
-        else:
-            return date
\ No newline at end of file
+#    def compute_next_invoice_date(self):
+#        date = super(Subscription, self).compute_next_invoice_date()
+#        if(self.include and not self.next_invoice_date):
+#            return self.invoice_start_date or self.start_date
+#        else:
+#            return date
+
+    @classmethod
+    @ModelView.button
+    @Workflow.transition('running')
+    def run(cls, subscriptions):
+        pool = Pool()
+        Line = pool.get('sale.subscription.line')
+        lines = []
+        for subscription in subscriptions:
+            if not subscription.next_invoice_date:
+                if subscription.include:
+                    subscription.next_invoice_date = (subscription.invoice_start_date or subscription.start_date)
+                else:
+                    subscription.next_invoice_date = (subscription.compute_next_invoice_date())
+            for line in subscription.lines:
+                if (line.next_consumption_date is None
+                        and not line.consumed):
+                    if subscription.include:
+                        subscription.next_invoice_date = (subscription.invoice_start_date or subscription.start_date)
+                    else:
+                        line.next_consumption_date = (line.compute_next_consumption_date())
+            lines.extend(subscription.lines)
+        Line.save(lines)
+        cls.save(subscriptions)
\ No newline at end of file