Created
November 18, 2010 12:20
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Broken object migration with ZODB
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import imp | |
import sys | |
def create_modules(module_path): | |
path = "" | |
module = None | |
for element in module_path.split('.'): | |
path += element | |
try: | |
module = __import__(path) | |
except ImportError: | |
new = imp.new_module(path) | |
if module is not None: | |
setattr(module, element, new) | |
module = new | |
sys.modules[path] = module | |
__import__(path) | |
path += "." | |
return module | |
def stub(module_path, class_name, base_class, meta_class=type): | |
module = create_modules(module_path) | |
cls = meta_class(class_name, (base_class, ), {}) | |
setattr(module, class_name, cls) | |
def migrate(self): | |
# import known base class (or best match!) | |
from Products.ATContentTypes.content.folder import ATFolder | |
# stub out broken class | |
stub('Products.MyOldBrokenProduct.SomeClass', 'SomeClass', ATFolder) | |
# enjoy | |
print self['some_old_site'].portal_old_broken_tool.valuable_data |
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NB: This only works for classes that are pickled into a dict, which, thankfully, means most of them.