add cronjob

planner.py

@@ -84,6 +84,9 @@ class ScheduledBooking(DeactivableMixin, ModelSQL, ModelView):
         string='Next Dates', readonly=True,
         help='the next 5 appointments based on the configured rule'),
         'on_change_with_nextdates')
+    nextrun = fields.One2Many(
+        string='Next Execution Date', size=1, field='planner',
+        model_name='cashbook.planner.nextrun')
 
     @classmethod
     def __setup__(cls):
@@ -277,4 +280,52 @@ class ScheduledBooking(DeactivableMixin, ModelSQL, ModelView):
         IrDate = Pool().get('ir.date')
         return IrDate.today()
 
+    @classmethod
+    def update_next_occurence(cls, records):
+        """ compute date of next execution, create/update nextrun-record,
+            delete nextrun-record if scheduled booking is disabled
+
+        Args:
+            records (list): scheduled-booking records
+        """
+        pool = Pool()
+        IrDate = pool.get('ir.date')
+        NextRun = pool.get('cashbook.planner.nextrun')
+
+        to_create = []
+        to_write = []
+        to_delete = []
+        for record in records:
+            if not record.active:
+                # delete nextrun-record if disabled
+                if record.nextrun:
+                    to_delete.extend(record.nextrun)
+            elif record.active:
+                # get next-run date
+                next_date = record._compute_dates_by_rrule(
+                    start_date=IrDate.today(), count=1)
+                if next_date:
+                    next_date = next_date[0]
+                else:
+                    continue
+
+                if not record.nextrun:
+                    # add record if not exist
+                    to_create.append({'planner': record.id, 'date': next_date})
+                else:
+                    # update existing records
+                    for nxrun in record.nextrun:
+                        if nxrun.date != next_date:
+                            to_write.extend([[nxrun], {'date': next_date}])
+        if to_create:
+            NextRun.create(to_create)
+        if to_delete:
+            NextRun.delete(to_delete)
+        if to_write:
+            NextRun.write(*to_write)
+
+    @classmethod
+    def cronjob(cls):
+        pass
+
 # ens ScheduledBooking