[Zope3-Users] Prevent Duplicate Persistency

[Dax]

Thanks a lot, Mats.  This is a way to do it, but if I were to add a
"name" schema to IMark and checkName on the actual "name", then I
would not be able to do this for "url" as well, right?  So my question
is how would I do this for url without having url as the name for the
Mark object?

On 3/15/06, Mats Nordgren <mats at ronin-group.org> wrote:
> This could be done by using the URL as the name for the Mark object.
>
> from zope.app.container.contained import NameChooser
>
> Class MarkNameChooser(NameChooser):
>         def chooseName(self, name, object):
>                 name = object.url
>                 self.checkName(name, object)
>                 return name
>
> <adapter
>         for=".interfaces.IMarkContainer"
>       provides="zope.app.container.interfaces.INameChooser"
>       factory=".bookmarks.MarkNameChooser" />
>
> Make sure your Mark object is configured with set_before_add
>
> <addform
>         ...
>         set_before_add="url" />
>
>
> -----Original Message-----
> From: zope3-users-bounces at zope.org [mailto:zope3-users-bounces at zope.org] On
> Behalf Of Dax
> Sent: Tuesday, March 14, 2006 8:00 PM
> To: zope3-users at zope.org
> Subject: [Zope3-Users] Prevent Duplicate Persistency
>
> For the following example (taken from "Zope3 In 30 Minutes"):
>
> class IMark(Interface):
>     """This is the book mark object."""
>
>     url = TextLine(
>         title=u"URL/Link",
>         description=u"URL of the website",
>         default=u"http://www.zope.org",
>         required=True)
>
>     description = Text(
>         title=u"Description",
>         description=u"Description of the website",
>         default=u"",
>         required=False)
>
> How can I prevent Mark objects from having the same url?  So if a Mark
> object exists in BookMarker with Mark.url="http://www.zope.org/", how
> can I prevent another Mark object from being added when its url is
> "http://www.zope.org"?
>
> Thanks.
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>