feat: Se añade workflow a pending_task

core/Call/models/pending_task.py

@@ -1,11 +1,10 @@
 # This file is part of Tryton.  The COPYRIGHT file at the top level of
 # this repository contains the full copyright notices and license terms.
-
-from trytond.model import ModelSQL, ModelView, fields
+from trytond.model import Workflow, ModelSQL, ModelView, fields
 from trytond.pyson import Eval
 
 
-class PendingTask(ModelSQL, ModelView):
+class PendingTask(Workflow, ModelSQL, ModelView):
     'Tarea a realizar a un seguimiento de prospecto'
     __name__ = "sale.pending_task"
 
@@ -27,18 +26,21 @@ class PendingTask(ModelSQL, ModelView):
     @classmethod
     def __setup__(cls):
         super(PendingTask, cls).__setup__()
+        cls._transitions |= set((
+            ('pending', 'done'),
+        ))
         cls._buttons.update({
             'close_task': {
-                'invisible': Eval('state') == 'done'
+                'invisible': ~Eval('state').in_(['pending']),
+                'depends':['state']
                 }
             })
 
     @classmethod
     @ModelView.button
+    @Workflow.transition('done')
     def close_task(cls, tasks):
-        for task in tasks:
-            task.state = 'done'
-            task.save()
+        pass
 
     @classmethod
     def default_state(cls):