Getting to container from a method called by the factory
I'm trying to check if the container from which the user selected a product from the add menu has an "acl_users" folder. When the user selects the option from the add menu, they get a form. When they submit the form, the method (a PythonMethod) does this: folder=self.Destination() if hasattr(folder, 'acl_users'): ...do something... else: ...complain... Even though I know the folder has an acl_users (and having this function return folder.objectIds() proves it), the above code will always complain. Is there a problem with using hasattr in this context? Kevin http://www.byproducts.com - Humor and Novelties
Kevin Dangoor wrote:
I'm trying to check if the container from which the user selected a product from the add menu has an "acl_users" folder. When the user selects the option from the add menu, they get a form. When they submit the form, the method (a PythonMethod) does this:
folder=self.Destination() if hasattr(folder, 'acl_users'): ...do something... else: ...complain...
Even though I know the folder has an acl_users (and having this function return folder.objectIds() proves it), the above code will always complain. Is there a problem with using hasattr in this context?
Well, first of all, because of acquisition, if there's a acl_users at the top level this will always return true. Next, PythonMethods have trouble with hasattr AFAIK - so instead do: folder=self.Destination() if 'acl_users' in folder.objectIds(): ...do something... else: ...complain... -- Itamar S.T. itamar@maxnm.com "It don't get thingier than that!"
----- Original Message ----- From: "Itamar Shtull-Trauring" <itamar@maxnm.com> To: "Kevin Dangoor" <kid@kendermedia.com> Cc: <zope-dev@zope.org> Sent: Wednesday, June 07, 2000 3:44 AM Subject: Re: [Zope-dev] Getting to container from a method called by the factory
Kevin Dangoor wrote:
I'm trying to check if the container from which the user selected a product from the add menu has an "acl_users" folder. When the user
selects
the option from the add menu, they get a form. When they submit the form, the method (a PythonMethod) does this:
folder=self.Destination() if hasattr(folder, 'acl_users'): ...do something... else: ...complain...
Even though I know the folder has an acl_users (and having this function return folder.objectIds() proves it), the above code will always complain. Is there a problem with using hasattr in this context?
Well, first of all, because of acquisition, if there's a acl_users at the top level this will always return true.
I didn't think hasattr() used acquisition... I thought hasattr would tell you if something is within that object itself.
Next, PythonMethods have trouble with hasattr AFAIK - so instead do:
I didn't realize this.
folder=self.Destination() if 'acl_users' in folder.objectIds(): ...do something... else: ...complain...
Yep. I thought of that one, too. I figured hasattr might be more efficient in large folders. In this particular context, that little bit of efficiency is not important and your example would work fine. Thanks for the tip. Kevin
participants (2)
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Itamar Shtull-Trauring -
Kevin Dangoor