[IMP] fields: x2many fields of new records are new records

The value of an x2many field on a new record are new records, possibly
related to a real record, called its "origin".

1 files changed, 16 insertions, 0 deletions

diff --git a/odoo/tools/misc.py b/odoo/tools/misc.py
index 3d34c608fd4..e828443ae80 100644
--- a/odoo/tools/misc.py
+++ b/odoo/tools/misc.py
@@ -1045,12 +1045,28 @@ class OrderedSet(MutableSet):
     def discard(self, elem):
         self._map.pop(elem, None)
 
+
 class LastOrderedSet(OrderedSet):
     """ A set collection that remembers the elements last insertion order. """
     def add(self, elem):
         OrderedSet.discard(self, elem)
         OrderedSet.add(self, elem)
 
+
+class IterableGenerator:
+    """ An iterable object based on a generator function, which is called each
+        time the object is iterated over.
+    """
+    __slots__ = ['func', 'args']
+
+    def __init__(self, func, *args):
+        self.func = func
+        self.args = args
+
+    def __iter__(self):
+        return self.func(*self.args)
+
+
 def groupby(iterable, key=None):
     """ Return a collection of pairs ``(key, elements)`` from ``iterable``. The
         ``key`` is a function computing a key value for each element. This