Re: [Zope] can't delete most recently added key from a Persistent dictionary

12 Sep 1999


      At 12:23 12-9-99 , Roman Milner wrote:
...
Hello.  I have a problem trying to use the Persistent mixin class. I
have a dictionary attribute that holds configurable fields.  The
fields are added like this:
def store_new_fields(self, REQUEST):
                f = self.fields
                if hasattr(REQUEST, 'abstract_p'):
                        f[string.strip(REQUEST.new_item_name)] = {'type': 
REQUEST.dtype,
'abstract_p': REQUEST.abstract_p}
                 else:
                        f[string.strip(REQUEST.new_item_name)] = {'type': 
REQUEST.dtype,
'abstract_p': 0}
                 self.fields = f
I then delete items thusly:
def del_fields(self, the_fields):
                f = self.fields
                if type(the_fields) == type(""):
                        del(f[the_fields])
                else:
                        for fname in the_fields:
                                del(f[fname])
                self.fields = f
I think you are running into a problem with transactions here. Changes to 
persistant data only will really happen when you commit the transaction. 
Before this commit, you will not actually see the changes you made.

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