Here's a better CascadeOptions implementation:
from sets import Set
class CascadeOptions(Set):
"""keeps track of the options sent to relation().cascade"""
def __init__(self, arg=""):
values = util.Set([c.strip() for c in arg.split(',')])
if "delete-orphan" in values: self.add("delete-orphan")
if "delete" in values or self.delete_orphan or "all" in
values: self.add("delete")
if "save-update" in values or "all" in values: self.add
("save-update")
if "merge" in values or "all" in values: self.add("merge")
if "expunge" in values or "all" in values: self.add("expunge")
for name in ("delete-orphan", "delete", "save-update",
"merge", "expunge"):
setattr(self, name.replace("-", "_"), name in self)
# refresh_expire not really implemented as of yet
#self.refresh_expire = "refresh-expire" in values or "all"
in values
# def __contains__(self, item):
# return getattr(self, item.replace("-", "_"), False)
This does the item.replace("-", "_") part once on initialization
rather than every time __contains__ is called. It works as long as
nothing ever tries to change the options after the object is
initialized.
~ Daniel
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