Fix deadline default value, get deadline from parent if it exists or today+3days

src/collective/task/interfaces.py

@@ -4,9 +4,10 @@ import datetime
 
 from z3c.form.browser.select import SelectFieldWidget
 from zope import schema
+from zope.interface import provider
 
+from Products.CMFPlone.utils import base_hasattr
 from plone.autoform import directives as form
-from plone.directives.form import default_value
 from plone.formwidget.datetime.z3cform.widget import DatetimeFieldWidget
 from plone.supermodel import model
 from plone.theme.interfaces import IDefaultPloneLayer
@@ -22,12 +23,25 @@ class ICollectiveTaskLayer(IDefaultPloneLayer):
     """Marker interface that defines a Zope 3 browser layer."""
 
 
+@provider(schema.interfaces.IContextAwareDefaultFactory)
+def deadlineDefaultValue(context):
+    """Default value for deadline field, copy deadline of the parent (context),
+    or set it to today+3 days at 12:00"""
+    if base_hasattr(context, 'deadline'):
+        return context.deadline
+
+    date = datetime.datetime.today() + datetime.timedelta(days=3)
+    hour = datetime.time(12, 0)
+    return datetime.datetime.combine(date, hour)
+
+
 class IBaseTask(model.Schema):
     """Interface for all "tasks" content types"""
     title = schema.TextLine(title=_(u'Title'))
     note = schema.Text(title=_(u'Note'),
                        required=False)
     deadline = schema.Datetime(title=_(u'Deadline'),
+                               defaultFactory=deadlineDefaultValue,
                                required=False)
     form.widget(deadline=DatetimeFieldWidget)
 
@@ -57,11 +71,3 @@ class IBaseTask(model.Schema):
     form.widget(responsible=AjaxChosenMultiFieldWidget)
 
     form.order_after(note='responsible')
-
-
-@default_value(field=IBaseTask['deadline'])
-def deadlineDefaultValue(data):
-    """Default value for deadline field today+3 days at 18:00"""
-    date = datetime.datetime.today() + datetime.timedelta(days=3)
-    hour = datetime.time(12, 0)
-    return datetime.datetime.combine(date, hour)