[FIX] models: fixes #1017; do not update list in place in the construction of _depends on models
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@ -591,7 +591,7 @@ class BaseModel(object):
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depends = dict(parent_class._depends)
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for m, fs in cls._depends.iteritems():
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depends.setdefault(m, []).extend(fs)
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depends[m] = depends.get(m, []) + fs
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old_constraints = parent_class._constraints
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new_constraints = cls._constraints
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