[Zope3-Users] Extending IImage
Hi guys,
Im trying to extend the Interface IImage by a title
and a caption. My plan was to use zope.app.file.interfaces.IImage as base
interface and zope.app.file.Image as base class, but that doesnt work. Every
time I submit the add form, I get the following traceback:
[]
File C:\Python24\Lib\site-packages\zope\tales\tales.py,
line 696, in evaluate
return _expression_(self)
File
C:\Python24\Lib\site-packages\zope\tales\expressions.py, line 205,
in __call__
return self._eval(econtext)
File C:\Python24\Lib\site-packages\zope\tales\expressions.py,
line 199, in _eval
return ob()
File
C:\Python24\Lib\site-packages\zope\app\form\browser\add.py, line
62, in update
self.createAndAdd(data)
File
C:\Python24\Lib\site-packages\zope\app\form\browser\add.py, line 120,
in createAndAdd
field.set(adapted, data[name])
File
C:\Python24\Lib\site-packages\zope\schema\_bootstrapfields.py, line
183, in set
setattr(object, self.__name__,
value)
File
C:\Python24\Lib\site-packages\zope\security\checker.py, line 488,
in check_setattr
self._checker2.check_setattr(object, name)
ForbiddenAttribute: ('contentType', pr.image.image.CustomImage
object at 0x02FB8CB0)
Whats the problem? Why is contentType
forbidden? Data and contentType are valid attributes
of the base interface zope.app.file.interfaces.IImage.
I would appreciate every hint showing me why Im
off the mark. Thanks in advance,
Arne
PS: Im working on Zope 3.3 and Python 2.4. The
following lines show the interface, the class and the zcml-directives for the
add form.
Interfaces.py:
from zope.app.file.interfaces import IImage
class ICustomImage(IImage):
imagetitle = TextLine(
title=_(uTitle),
description=_(uThe image
title.),
default=u,
required=False)
imagecaption = Text(
title=_(uCaption),
description=_(uThe image
caption. Will be displayed in the user view. ),
default=u,
required=False)
image.py:
from zope.app.file import Image
from pr.image.interfaces import ICustomImage
class CustomImage(Image):
implements(ICustomImage)
title = u''
description = u''
def __init__(self, data='', title='',
caption=''):
super(Image, self).__init__(data)
self.imagetitle = title
self.imagecaption = caption
configure.zcml:
[]
addform
label=Add
customized image
name=AddCustomImage.html
schema=pr.image.interfaces.ICustomImage
content_factory=pr.image.image.CustomImage
fields=contentType data imagetitle imagecaption
permission=zope.ManageContent
/
addMenuItem
class=pr.image.image.CustomImage
title=Customized
image
description=A
customized image
permission=zope.ManageContent
view=AddCustomImage.html
/
[]
___
Zope3-users mailing list
Zope3-users@zope.org
http://mail.zope.org/mailman/listinfo/zope3-users
Re: [Zope3-Users] Extending IImage
Hi,
On Fri, Nov 10, 2006 at 10:32:13AM +0100, Nordmann Arne wrote:
Hi guys,
I'm trying to extend the Interface IImage by a title and a caption. My
plan was to use zope.app.file.interfaces.IImage as base interface and
zope.app.file.Image as base class, but that doesn't work. Every time I
submit the add form, I get the following traceback:
[...]
File C:\Python24\Lib\site-packages\zope\tales\tales.py, line 696, in
evaluate
return expression(self)
File C:\Python24\Lib\site-packages\zope\tales\expressions.py, line
205, in __call__
return self._eval(econtext)
File C:\Python24\Lib\site-packages\zope\tales\expressions.py, line
199, in _eval
return ob()
File C:\Python24\Lib\site-packages\zope\app\form\browser\add.py,
line 62, in update
self.createAndAdd(data)
File C:\Python24\Lib\site-packages\zope\app\form\browser\add.py,
line 120, in createAndAdd
field.set(adapted, data[name])
File C:\Python24\Lib\site-packages\zope\schema\_bootstrapfields.py,
line 183, in set
setattr(object, self.__name__, value)
File C:\Python24\Lib\site-packages\zope\security\checker.py, line
488, in check_setattr
self._checker2.check_setattr(object, name)
ForbiddenAttribute: ('contentType', pr.image.image.CustomImage object
at 0x02FB8CB0)
What's the problem? Why is contentType forbidden? Data and
contentType are valid attributes of the base interface
zope.app.file.interfaces.IImage.
You need a seperate class ...-Statement for any class - no matter, which
interface(s) it provides. The require-attribute 'like_class' might come handy...
However - I've had your problem to (needed to provide 'alt' and 'description'-
img-attributes to be XHTML-compliant...).
The solution is rather simple:
* dc=IZopeDublinCore(myimageobject) (see zope.dublincore)
* title-information is in dc.title
* caption is in dc.description
* an additional view 'longdesc.txt' for IImage provides content of
dc.description as plain text
img tal:attributes=src context/@@absolute_url;
longdesc string:${context/@@absolute_url}/longdesc.txt alt=title /
This way you can use original image-class.
HTH,
Frank
___
Zope3-users mailing list
Zope3-users@zope.org
http://mail.zope.org/mailman/listinfo/zope3-users
Re: [Zope3-Users] Extending IImage
On Fri, Nov 10, 2006 at 02:42:37PM +0100, FB wrote: You need a seperate class ...-Statement for any class - no matter, which interface(s) it provides. The require-attribute 'like_class' might come handy... Sorry for my poor english: for any class is wrong. Correct is for *every* class. Regards, Frank ___ Zope3-users mailing list Zope3-users@zope.org http://mail.zope.org/mailman/listinfo/zope3-users
RE: [Zope3-Users] Extending IImage
Hi Frank, thank you. That's a really good idea to save time and work. It seems to work very well. Kindly, Arne ___ Zope3-users mailing list Zope3-users@zope.org http://mail.zope.org/mailman/listinfo/zope3-users
