def make_class_properties(cls):
# NOTE(danms/comstud): Inherit fields from super classes.
# mro() returns the current class first and returns 'object' last, so
# those can be skipped. Also be careful to not overwrite any fields
# that already exist. And make sure each cls has its own copy of
# fields and that it is not sharing the dict with a super class.
cls.fields = dict(cls.fields)
for supercls in cls.mro()[1:-1]:
if not hasattr(supercls, 'fields'):
continue
for name, field in supercls.fields.items():
if name not in cls.fields:
cls.fields[name] = field
for name, field in cls.fields.iteritems():
if not isinstance(field, fields.Field):
raise exception.ObjectFieldInvalid(field=name,
objname=cls.obj_name())
def getter(self, name=name):
attrname = get_attrname(name)
if not hasattr(self, attrname):
self.obj_load_attr(name)
return getattr(self, attrname)
def setter(self, value, name=name, field=field):
self._changed_fields.add(name)
try:
return setattr(self, get_attrname(name),
field.coerce(self, name, value))
except Exception:
attr = "%s.%s" % (self.obj_name(), name)
LOG.exception(_('Error setting %(attr)s') % {'attr': attr})
raise
setattr(cls, name, property(getter, setter))
def make_class_properties(cls):
# NOTE(danms/comstud): Inherit fields from super classes.
# mro() returns the current class first and returns 'object' last, so
# those can be skipped. Also be careful to not overwrite any fields
# that already exist. And make sure each cls has its own copy of
# fields and that it is not sharing the dict with a super class.
cls.fields = dict(cls.fields)
for supercls in cls.mro()[1:-1]:
if not hasattr(supercls, 'fields'):
continue
for name, field in supercls.fields.items():
if name not in cls.fields:
cls.fields[name] = field
for name, field in six.iteritems(cls.fields):
if not isinstance(field, obj_fields.Field):
raise exception.ObjectFieldInvalid(
field=name, objname=cls.obj_name())
def getter(self, name=name):
attrname = get_attrname(name)
if not hasattr(self, attrname):
self.obj_load_attr(name)
return getattr(self, attrname)
def setter(self, value, name=name, field=field):
attrname = get_attrname(name)
field_value = field.coerce(self, name, value)
if field.read_only and hasattr(self, attrname):
# Note(yjiang5): _from_db_object() may iterate
# every field and write, no exception in such situation.
if getattr(self, attrname) != field_value:
raise exception.ReadOnlyFieldError(field=name)
else:
return
self._changed_fields.add(name)
try:
return setattr(self, attrname, field_value)
except Exception:
attr = "%s.%s" % (self.obj_name(), name)
LOG.exception(_LE('Error setting %(attr)s'), {'attr': attr})
raise
def deleter(self, name=name):
attrname = get_attrname(name)
if not hasattr(self, attrname):
raise AttributeError('No such attribute `%s' % name)
delattr(self, get_attrname(name))
setattr(cls, name, property(getter, setter, deleter))
