Config could have multiple parents

tests/test_metaconfig.py

@@ -293,8 +293,8 @@ def test_meta_add_config_readd():
     config = Config(od, session_id='new')
     #
     meta.config.add(config)
-    #
+    meta2.config.add(config)
-    raises(ConflictError, "meta2.config.add(config)")
+    assert len(list(config.config.parents())) == 2
 
 
 def test_meta_new_config_wrong_name():
@@ -429,7 +429,11 @@ def test_meta_unconsistent():
     meta.owner.set(owners.meta1)
     raises(TypeError, 'MetaConfig("string")')
     #same descr but conf1 already in meta
-    raises(ValueError, "MetaConfig([conf1, conf3])")
+    assert len(list(conf1.config.parents())) == 1
+    assert len(list(conf3.config.parents())) == 0
+    new_meta = MetaConfig([conf1, conf3])
+    assert len(list(conf1.config.parents())) == 2
+    assert len(list(conf3.config.parents())) == 1
     #not same descr
     raises(ValueError, "MetaConfig([conf3, conf4])")
 
@@ -786,39 +790,54 @@ def test_meta_callback_follower():
     interface1 = Leadership('val1', '', [val1, val3, val4])
     od = OptionDescription('root', '', [interface1])
     maconfig = OptionDescription('rootconfig', '', [val, interface1])
-    cfg = Config(maconfig, session_id='cfg1')
+    cfg1 = Config(maconfig, session_id='cfg1')
-    meta = MetaConfig([cfg])
+    meta = MetaConfig([cfg1])
     meta.property.read_write()
-    assert meta.config('cfg1').value.dict() == {'val1.val2': ['val'], 'val1.val1': ['val'], 'val1.val3': ['val'], 'val': 'val'}
+    assert cfg1.value.dict() == {'val1.val2': ['val'], 'val1.val1': ['val'], 'val1.val3': ['val'], 'val': 'val'}
-    meta.config('cfg1').option('val').value.set('val1')
+    #
-    assert meta.config('cfg1').value.dict() == {'val1.val2': ['val1'], 'val1.val1': ['val1'], 'val1.val3': ['val1'], 'val': 'val1'}
+    cfg1.option('val').value.set('val1')
-    meta.config('cfg1').option('val').value.reset()
+    assert cfg1.value.dict() == {'val1.val2': ['val1'], 'val1.val1': ['val1'], 'val1.val3': ['val1'], 'val': 'val1'}
+    #
+    cfg1.option('val').value.reset()
     meta.option('val').value.set('val1')
-    assert meta.config('cfg1').value.dict() == {'val1.val2': ['val1'], 'val1.val1': ['val1'], 'val1.val3': ['val1'], 'val': 'val1'}
+    assert cfg1.value.dict() == {'val1.val2': ['val1'], 'val1.val1': ['val1'], 'val1.val3': ['val1'], 'val': 'val1'}
+    #
     meta.option('val').value.reset()
-    meta.config('cfg1').option('val1.val2', 0).value.set('val2')
+    cfg1.option('val1.val2', 0).value.set('val2')
-    assert meta.config('cfg1').value.dict() == {'val1.val2': ['val2'], 'val1.val1': ['val'], 'val1.val3': ['val'], 'val': 'val'}
+    assert cfg1.value.dict() == {'val1.val2': ['val2'], 'val1.val1': ['val'], 'val1.val3': ['val'], 'val': 'val'}
-    meta.config('cfg1').option('val1.val2', 0).value.reset()
+    #
-    assert meta.config('cfg1').value.dict() == {'val1.val2': ['val'], 'val1.val1': ['val'], 'val1.val3': ['val'], 'val': 'val'}
+    cfg1.option('val1.val2', 0).value.reset()
+    assert cfg1.value.dict() == {'val1.val2': ['val'], 'val1.val1': ['val'], 'val1.val3': ['val'], 'val': 'val'}
+    #
     meta.option('val1.val2', 0).value.set('val2')
-    assert meta.config('cfg1').value.dict() == {'val1.val2': ['val2'], 'val1.val1': ['val'], 'val1.val3': ['val'], 'val': 'val'}
+    assert cfg1.value.dict() == {'val1.val2': ['val'], 'val1.val1': ['val'], 'val1.val3': ['val'], 'val': 'val'}
-    meta.config('cfg1').option('val1.val3', 0).value.set('val6')
+    #
-    assert meta.config('cfg1').value.dict() == {'val1.val2': ['val2'], 'val1.val1': ['val'], 'val1.val3': ['val6'], 'val': 'val'}
+    meta.option('val1.val1').value.set(['val'])
+    assert cfg1.value.dict() == {'val1.val2': ['val2'], 'val1.val1': ['val'], 'val1.val3': ['val'], 'val': 'val'}
+    #
+    cfg1.option('val1.val3', 0).value.set('val6')
+    assert cfg1.value.dict() == {'val1.val2': ['val2'], 'val1.val1': ['val'], 'val1.val3': ['val6'], 'val': 'val'}
+    #
     meta.option('val1.val2', 0).value.reset()
-    meta.config('cfg1').option('val1.val3', 0).value.reset()
+    cfg1.option('val1.val3', 0).value.reset()
-    meta.config('cfg1').option('val1.val1').value.set(['val3'])
+    cfg1.option('val1.val1').value.set(['val3'])
-    assert meta.config('cfg1').value.dict() == {'val1.val2': ['val3'], 'val1.val1': ['val3'], 'val1.val3': ['val3'], 'val': 'val'}
+    assert cfg1.value.dict() == {'val1.val2': ['val3'], 'val1.val1': ['val3'], 'val1.val3': ['val3'], 'val': 'val'}
-    meta.config('cfg1').option('val1.val1').value.reset()
+    #
-    assert meta.config('cfg1').value.dict() == {'val1.val2': ['val'], 'val1.val1': ['val'], 'val1.val3': ['val'], 'val': 'val'}
+    cfg1.option('val1.val1').value.reset()
+    assert cfg1.value.dict() == {'val1.val2': ['val'], 'val1.val1': ['val'], 'val1.val3': ['val'], 'val': 'val'}
+    #
     meta.option('val1.val1').value.set(['val3'])
-    assert meta.config('cfg1').value.dict() == {'val1.val2': ['val3'], 'val1.val1': ['val3'], 'val1.val3': ['val3'], 'val': 'val'}
+    assert cfg1.value.dict() == {'val1.val2': ['val3'], 'val1.val1': ['val3'], 'val1.val3': ['val3'], 'val': 'val'}
-    meta.config('cfg1').option('val1.val2', 0).value.set('val2')
+    #
-    assert meta.config('cfg1').value.dict() == {'val1.val2': ['val2'], 'val1.val1': ['val3'], 'val1.val3': ['val3'], 'val': 'val'}
+    cfg1.option('val1.val2', 0).value.set('val2')
+    assert cfg1.value.dict() == {'val1.val2': ['val2'], 'val1.val1': ['val3'], 'val1.val3': ['val3'], 'val': 'val'}
+    #
     meta.option('val1.val1').value.set(['val3', 'rah'])
-    assert meta.config('cfg1').value.dict() == {'val1.val2': ['val2', 'rah'], 'val1.val1': ['val3', 'rah'], 'val1.val3': ['val3', 'rah'], 'val': 'val'}
+    assert cfg1.value.dict() == {'val1.val2': ['val2', 'rah'], 'val1.val1': ['val3', 'rah'], 'val1.val3': ['val3', 'rah'], 'val': 'val'}
+    #
     meta.option('val1.val1').value.pop(1)
     meta.option('val1.val1').value.set(['val4'])
-    assert meta.config('cfg1').value.dict() == {'val1.val2': ['val2'], 'val1.val1': ['val4'], 'val1.val3': ['val4'], 'val': 'val'}
+    assert cfg1.value.dict() == {'val1.val2': ['val2'], 'val1.val1': ['val4'], 'val1.val3': ['val4'], 'val': 'val'}
 
 
 def test_meta_reset():
@@ -861,8 +880,13 @@ def test_meta_properties_meta_copy():
     meta.property.read_write()
 
     conf3 = meta.config('conf1').config.copy(session_id='conf3')
+    # old fashion
     meta2 = conf3.config.metaconfig()
     assert meta.config.name() == meta2.config.name()
+    # new method
+    meta2 = list(conf3.config.parents())
+    assert len(meta2) == 1
+    assert meta.config.name() == meta2[0].config.name()
 
     assert meta.config('conf1').value.dict() == {'ip_admin_eth0': ['192.168.1.1']}
     assert meta.config('conf2').value.dict() == {'ip_admin_eth0': ['192.168.1.1']}

tests/test_mixconfig.py

@@ -306,7 +306,11 @@ def test_mix_unconsistent():
     mix.owner.set(owners.mix1)
     raises(TypeError, 'MixConfig(od2, "string")')
     # same descr but conf1 already in mix
-    raises(ValueError, "MixConfig(od2, [conf1, conf3])")
+    assert len(list(conf1.config.parents())) == 1
+    assert len(list(conf3.config.parents())) == 0
+    new_mix = MixConfig(od2, [conf1, conf3])
+    assert len(list(conf1.config.parents())) == 2
+    assert len(list(conf3.config.parents())) == 1
     # not same descr
     MixConfig(od2, [conf3, conf4])
 
@@ -647,32 +651,47 @@ def test_mix_callback_follower():
     mix = MixConfig(maconfig, [cfg])
     mix.property.read_write()
     assert mix.config('cfg1').value.dict() == {'val1.val2': ['val'], 'val1.val1': ['val'], 'val1.val3': ['val'], 'val': 'val'}
+    #
     mix.config('cfg1').option('val').value.set('val1')
     assert mix.config('cfg1').value.dict() == {'val1.val2': ['val1'], 'val1.val1': ['val1'], 'val1.val3': ['val1'], 'val': 'val1'}
+    #
     mix.config('cfg1').option('val').value.reset()
     mix.option('val').value.set('val1')
     assert mix.config('cfg1').value.dict() == {'val1.val2': ['val1'], 'val1.val1': ['val1'], 'val1.val3': ['val1'], 'val': 'val1'}
+    #
     mix.option('val').value.reset()
     mix.config('cfg1').option('val1.val2', 0).value.set('val2')
     assert mix.config('cfg1').value.dict() == {'val1.val2': ['val2'], 'val1.val1': ['val'], 'val1.val3': ['val'], 'val': 'val'}
+    #
     mix.config('cfg1').option('val1.val2', 0).value.reset()
     assert mix.config('cfg1').value.dict() == {'val1.val2': ['val'], 'val1.val1': ['val'], 'val1.val3': ['val'], 'val': 'val'}
+    #
     mix.option('val1.val2', 0).value.set('val2')
+    assert mix.config('cfg1').value.dict() == {'val1.val2': ['val'], 'val1.val1': ['val'], 'val1.val3': ['val'], 'val': 'val'}
+    #
+    mix.option('val1.val1').value.set(['val'])
     assert mix.config('cfg1').value.dict() == {'val1.val2': ['val2'], 'val1.val1': ['val'], 'val1.val3': ['val'], 'val': 'val'}
+    #
     mix.config('cfg1').option('val1.val3', 0).value.set('val6')
     assert mix.config('cfg1').value.dict() == {'val1.val2': ['val2'], 'val1.val1': ['val'], 'val1.val3': ['val6'], 'val': 'val'}
+    #
     mix.option('val1.val2', 0).value.reset()
     mix.config('cfg1').option('val1.val3', 0).value.reset()
     mix.config('cfg1').option('val1.val1').value.set(['val3'])
     assert mix.config('cfg1').value.dict() == {'val1.val2': ['val3'], 'val1.val1': ['val3'], 'val1.val3': ['val3'], 'val': 'val'}
+    #
     mix.config('cfg1').option('val1.val1').value.reset()
     assert mix.config('cfg1').value.dict() == {'val1.val2': ['val'], 'val1.val1': ['val'], 'val1.val3': ['val'], 'val': 'val'}
+    #
     mix.option('val1.val1').value.set(['val3'])
     assert mix.config('cfg1').value.dict() == {'val1.val2': ['val3'], 'val1.val1': ['val3'], 'val1.val3': ['val3'], 'val': 'val'}
+    #
     mix.config('cfg1').option('val1.val2', 0).value.set('val2')
     assert mix.config('cfg1').value.dict() == {'val1.val2': ['val2'], 'val1.val1': ['val3'], 'val1.val3': ['val3'], 'val': 'val'}
+    #
     mix.option('val1.val1').value.set(['val3', 'rah'])
     assert mix.config('cfg1').value.dict() == {'val1.val2': ['val2', 'rah'], 'val1.val1': ['val3', 'rah'], 'val1.val3': ['val3', 'rah'], 'val': 'val'}
+    #
     mix.option('val1.val1').value.pop(1)
     mix.option('val1.val1').value.set(['val4'])
     assert mix.config('cfg1').value.dict() == {'val1.val2': ['val2'], 'val1.val1': ['val4'], 'val1.val3': ['val4'], 'val': 'val'}
@@ -732,8 +751,13 @@ def test_mix_properties_mix_copy():
     mix.property.read_write()
 
     conf3 = mix.config('conf1').config.copy(session_id='conf3')
+    # old fashion
     mix2 = conf3.config.metaconfig()
     assert mix.config.name() == mix2.config.name()
+    # new method
+    mix2 = list(conf3.config.parents())
+    assert len(mix2) == 1
+    assert mix.config.name() == mix2[0].config.name()
 
     assert mix.config('conf1').value.dict() == {'ip_admin_eth0': ['192.168.1.1']}
     assert mix.config('conf2').value.dict() == {'ip_admin_eth0': ['192.168.1.1']}
@@ -1121,7 +1145,8 @@ def test_mix_add_config_readd():
     #
     config = Config(od, session_id='new')
     mix.config.add(config)
-    raises(ConflictError, "mix2.config.add(config)")
+    mix2.config.add(config)
+    assert len(list(config.config.parents())) == 2
 
 
 def test_meta_new_mixconfig():

tiramisu/api.py

@@ -1339,6 +1339,7 @@ class _TiramisuContextConfig(TiramisuConfig, _TiramisuContextConfigReset):
              session_id=None,
              persistent=False,
              storage=None):
+        """Copy current config"""
         return self._return_config(self._config_bag.context.duplicate(session_id,
                                                                       persistent=persistent,
                                                                       storage=storage))
@@ -1348,6 +1349,7 @@ class _TiramisuContextConfig(TiramisuConfig, _TiramisuContextConfigReset):
                   persistent=False,
                   storage=None,
                   metaconfig_prefix=None):
+        """Copy current config with all parents"""
         return self._return_config(self._config_bag.context.duplicate(session_id,
                                                                       persistent=persistent,
                                                                       storage=storage,
@@ -1355,9 +1357,19 @@ class _TiramisuContextConfig(TiramisuConfig, _TiramisuContextConfigReset):
                                                                       deep=True))
 
     def metaconfig(self):
-        return self._return_config(self._config_bag.context.cfgimpl_get_meta())
+        """Get first meta configuration (obsolete please use parents)"""
+        try:
+            return next(self.parents())
+        except StopIteration:
+            return None
+
+    def parents(self):
+        """Get all parents of current config"""
+        for parent in self._config_bag.context.get_parents():
+            yield self._return_config(parent)
 
     def path(self):
+        """Get path from config (all parents name)"""
         return self._config_bag.context.cfgimpl_get_config_path()
 
 

tiramisu/config.py

@@ -599,7 +599,7 @@ class _CommonConfig(SubConfig):
                  '_impl_settings',
                  '_impl_properties_cache',
                  '_impl_permissives_cache',
-                 '_impl_meta',
+                 'parents',
                  'impl_type')
 
     def _impl_build_all_caches(self):
@@ -609,9 +609,9 @@ class _CommonConfig(SubConfig):
         config_bag = ConfigBag(context=self)
         descr.impl_build_force_store_values(config_bag)
 
-    def cfgimpl_get_meta(self):
+    def get_parents(self):
-        if self._impl_meta is not None:
+        for parent in self.parents:
-            return self._impl_meta()
+            yield parent()
 
     # information
     def impl_set_information(self, key, value):
@@ -689,19 +689,27 @@ class _CommonConfig(SubConfig):
         duplicated_config.cfgimpl_reset_cache(None, None)
         if child is not None:
             duplicated_config._impl_children.append(child)
-            child._impl_meta = weakref.ref(duplicated_config)
+            child.parents.append(weakref.ref(duplicated_config))
-        if self._impl_meta:
+        if self.parents:
             if deep:
-                duplicated_config = self._impl_meta().duplicate(deep=deep,
+                for parent in self.parents:
+                    duplicated_config = parent().duplicate(deep=deep,
                                                          storage=storage,
                                                          metaconfig_prefix=metaconfig_prefix,
                                                          child=duplicated_config,
                                                          persistent=persistent)
             else:
-                duplicated_config._impl_meta = self._impl_meta
+                duplicated_config.parents = self.parents
-                self._impl_meta()._impl_children.append(duplicated_config)
+                for parent in self.parents:
+                    parent()._impl_children.append(duplicated_config)
         return duplicated_config
 
+    def cfgimpl_get_config_path(self):
+        path = self._impl_name
+        for parent in self.parents:
+            path = parent().cfgimpl_get_config_path() + '.' + path
+        return path
+
 
 # ____________________________________________________________
 class KernelConfig(_CommonConfig):
@@ -733,7 +741,7 @@ class KernelConfig(_CommonConfig):
         :param persistent: if persistent, don't delete storage when leaving
         :type persistent: `boolean`
         """
-        self._impl_meta = None
+        self.parents = []
         self._impl_symlink = []
         self._display_name = display_name
         if isinstance(descr, Leadership):
@@ -774,11 +782,6 @@ class KernelConfig(_CommonConfig):
     def impl_getname(self):
         return self._impl_name
 
-    def cfgimpl_get_config_path(self):
-        if self._impl_meta is None or self._impl_meta() is None:
-            return self._impl_name
-        return self._impl_meta().cfgimpl_get_config_path() + '.' + self._impl_name
-
 
 class KernelGroupConfig(_CommonConfig):
     __slots__ = ('__weakref__',
@@ -804,7 +807,7 @@ class KernelGroupConfig(_CommonConfig):
                     raise ConflictError(_('config name must be uniq in '
                                           'groupconfig for "{0}"').format(name))
         self._impl_children = children
-        self._impl_meta = None
+        self.parents = []
         session_id = gen_storage_id(session_id, self)
         assert valid_name(session_id), _("invalid session ID: {0} for config").format(session_id)
         super().__init__(_descr,
@@ -973,11 +976,6 @@ class KernelGroupConfig(_CommonConfig):
                 return child
         raise ConfigError(_('unknown config "{}"').format(name))
 
-    def cfgimpl_get_config_path(self):
-        if self._impl_meta is None or self._impl_meta() is None:
-            return self._impl_name
-        return self._impl_meta().cfgimpl_get_config_path() + '.' + self._impl_name
-
 
 class KernelMixConfig(KernelGroupConfig):
     __slots__ = ('_display_name',
@@ -998,9 +996,7 @@ class KernelMixConfig(KernelGroupConfig):
         for child in children:
             if not isinstance(child, (KernelConfig, KernelMixConfig)):
                 raise TypeError(_("child must be a Config, MixConfig or MetaConfig"))
-            if child.cfgimpl_get_meta() is not None:
+            child.parents.append(weakref.ref(self))
-                raise ValueError(_("child has already a {}config's").format(self.impl_type))
-            child._impl_meta = weakref.ref(self)
         properties, permissives, values, session_id = get_storages(self,
                                                                    session_id,
                                                                    persistent,
@@ -1183,13 +1179,11 @@ class KernelMixConfig(KernelGroupConfig):
     def add_config(self,
                    apiconfig):
         config = apiconfig._config_bag.context
-        if config._impl_meta is not None:
-            raise ConflictError(_('config is already in a metaconfig'))
         if config.impl_getname() in [child.impl_getname() for child in self._impl_children]:
             raise ConflictError(_('config name must be uniq in '
                                   'groupconfig for {0}').format(config.impl_getname()))
 
-        config._impl_meta = weakref.ref(self)
+        config.parents.append(weakref.ref(self))
         self._impl_children.append(config)
         config.cfgimpl_reset_cache(None, None)
 
@@ -1199,12 +1193,21 @@ class KernelMixConfig(KernelGroupConfig):
         if session_id is not None:
             for idx, child in enumerate(self._impl_children):
                 if session_id == child.impl_getname():
-                    child._impl_meta = None
                     child.cfgimpl_reset_cache(None, None)
-                    return self._impl_children.pop(idx)
+                    self._impl_children.pop(idx)
+                    break
+            else:
                 raise ConfigError(_('cannot find the config {}').format(session_id))
         if config is not None:
-            self._impl_children.pop(config)
+            self._impl_children.remove(config)
+            child = config
+        for index, parent in enumerate(child.parents):
+            if parent() == self:
+                child.parents.pop(index)
+                break
+        else:
+            raise ConfigError(_('cannot find the config {}').format(self.session_id))
+        return child
 
 
 class KernelMetaConfig(KernelMixConfig):
@@ -1285,7 +1288,7 @@ class KernelMetaConfig(KernelMixConfig):
             config.cfgimpl_get_settings().rw_remove = self.cfgimpl_get_settings().rw_remove
             config.cfgimpl_get_settings().default_properties = self.cfgimpl_get_settings().default_properties
 
-        config._impl_meta = weakref.ref(self)
+        config.parents.append(weakref.ref(self))
         self._impl_children.append(config)
         return config
 

tiramisu/value.py

@@ -140,13 +140,13 @@ class Values(object):
     def getdefaultvalue(self,
                         option_bag):
         """get default value:
-        - get meta config value or
+        - get parents config value or
         - get calculated value or
         - get default value
         """
-        moption_bag = self._get_meta(option_bag)
+        moption_bag = self._get_modified_parent(option_bag)
-        if moption_bag:
+        if moption_bag is not None:
-            # retrieved value from meta config
+            # retrieved value from parent config
             return moption_bag.config_bag.context.cfgimpl_get_values().get_cached_value(moption_bag)
 
         if option_bag.option.impl_has_callback():
@@ -328,23 +328,42 @@ class Values(object):
                           option_bag.index,
                           commit)
 
-    def _get_meta(self,
+    def _get_modified_parent(self,
                              option_bag):
-        context = option_bag.config_bag.context
+        """ Search in differents parents a Config with a modified value and return it
-        meta = context.cfgimpl_get_meta()
+        If not found, return None
-        if meta is None:
+        For follower option, return the Config where leader is modified
-            return None
+        """
+        def build_option_bag(option_bag, parent):
+            doption_bag = option_bag.copy()
+            config_bag = option_bag.config_bag.copy()
+            config_bag.context = parent
+            config_bag.unrestraint()
+            doption_bag.config_bag = config_bag
+            return doption_bag
+
         if option_bag.option.impl_is_follower():
             leader = option_bag.option.impl_get_leadership().get_leader()
             leaderpath = leader.impl_getpath()
-            # follower could be a "meta" only if leader hasn't value
             if self._p_.hasvalue(leaderpath,
                                  index=None):
                 return None
-        doption_bag = option_bag.copy()
+            config_bag = option_bag.config_bag
-        config_bag = option_bag.config_bag.copy()
+            leader_option_bag = OptionBag()
-        config_bag.context = meta
+            leader_option_bag.set_option(leader,
-        doption_bag.config_bag = config_bag
+                                         leaderpath,
+                                         None,
+                                         config_bag)
+            leader_option_bag = self._get_modified_parent(leader_option_bag)
+            if leader_option_bag is None:
+                return None
+            new_config_bag = leader_option_bag.config_bag
+            if not new_config_bag.context.cfgimpl_get_values()._p_.hasvalue(option_bag.path,
+                                                                            index=option_bag.index):
+                return None
+            return build_option_bag(option_bag, new_config_bag.context)
+        for parent in option_bag.config_bag.context.get_parents():
+            doption_bag = build_option_bag(option_bag, parent)
             if 'force_metaconfig_on_freeze' in option_bag.properties:
                 # remove force_metaconfig_on_freeze only if option in metaconfig
                 # hasn't force_metaconfig_on_freeze properties
@@ -354,12 +373,11 @@ class Values(object):
                     doption_bag.properties = ori_properties - {'force_metaconfig_on_freeze'}
                 else:
                     doption_bag.properties = ori_properties
-        config_bag.unrestraint()
+            parent_owner = parent.cfgimpl_get_values().getowner(doption_bag,
-        meta_option_bag = meta.cfgimpl_get_values().getowner(doption_bag,
                                                                 only_default=True)
-        if meta_option_bag == owners.default:
+            if parent_owner != owners.default:
+                return doption_bag
         return None
-        return meta_option_bag
 
 
     #______________________________________________________________________
@@ -408,8 +426,8 @@ class Values(object):
                                       index=option_bag.index)
         if validate_meta is not False and (owner is owners.default or \
                                            'frozen' in option_bag.properties and 'force_metaconfig_on_freeze' in option_bag.properties):
-            moption_bag = self._get_meta(option_bag)
+            moption_bag = self._get_modified_parent(option_bag)
-            if moption_bag:
+            if moption_bag is not None:
                 owner = moption_bag.config_bag.context.cfgimpl_get_values().getowner(moption_bag,
                                                                                      only_default=only_default)
             elif 'force_metaconfig_on_freeze' in option_bag.properties: