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import models
registered_models = {}
def register(model, app=None, manager_name='history'):
"""
Create historical model for `model` and attach history manager to `model`.
Keyword arguments:
app -- App to install historical model into (defaults to model.__module__)
manager_name -- class attribute name to use for historical manager
This method should be used as an alternative to attaching an
`HistoricalManager` instance directly to `model`.
"""
if not model in registered_models:
records = models.HistoricalRecords()
records.manager_name = manager_name
records.module = ("%s.models" % app) or model.__module__
records.finalize(model)
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