[Grok-dev] Custom Exception Views and application_url

Lacko Roman rlacko at gratex.com
Mon Mar 31 08:32:25 EDT 2008


First of all, thank you Grok and ZOPE developers for a wonderfull web framework.

I am finishing my first web project with Grok.
But i have one problem with customized exception views.
I created a custom view "Unauthorized" for exception "IUnauthorized":

class Unauthorized(grok.View):

    def update(self):

For that view I created template, in that template I use something like that (please note "${view/application_url}"):

  <a i18n:translate="" tal:attributes="href string:${view/application_url}/offers?offertype=sale&realtytype=apartment">sale</a>

When I try to browse grok administrator at url http://localhost:8080 to create application instance, the following page is rendered in browser:


<class 'zope.security.interfaces.Unauthorized'>
A server error occurred.


And following exception is thrown, (copy-paste from console output):

  2008-03-31T14:11:39 ERROR SiteError Exception while rendering view on exception
  File "d:\src\klucsiteenv\klucsite\buildout-eggs\zope.tales-3.4.0a1-py2.5.egg\zope\tales\tales.py", line 696, in evaluate
    return expression(self)
   - d:\src\klucsiteenv\klucsite\src\klucsite\app_templates\unauthorized.pt
   - Line 20, Column 6
   - Expression: <StringExpr u'${view/application_url}/offers?offertype=sale&realtytype=apartment'>
   - Names:
      {'args': (),
       'context': <zope.app.folder.folder.Folder object at 0x0208C2F0>,
       'default': <object object at 0x00A705E8>,
       'loop': {},
       'nothing': None,
       'options': {},
       'repeat': {},
       'request': <zc.resourcelibrary.publication.Request instance URL=http://localhost:8080/favicon.ico>,
       'static': <grok.components.DirectoryResource object at 0x02F8D4B0>,
       'template': <grok.components.TrustedFilePageTemplate object at 0x02E7D310>,
       'view': <klucsite.app.NotFound object at 0x02F8D3F0>}
  File "d:\src\klucsiteenv\klucsite\buildout-eggs\zope.tales-3.4.0a1-py2.5.egg\zope\tales\expressions.py", line 261, in __call__
    v = var(econtext)
  File "d:\src\klucsiteenv\klucsite\buildout-eggs\zope.tales-3.4.0a1-py2.5.egg\zope\tales\expressions.py", line 217, in __call__
    return self._eval(econtext)
  File "d:\src\klucsiteenv\klucsite\buildout-eggs\zope.tales-3.4.0a1-py2.5.egg\zope\tales\expressions.py", line 211, in _eval
    return ob()
  File "d:\src\klucsiteenv\klucsite\buildout-eggs\grok-0.11.1-py2.5.egg\grok\components.py", line 186, in application_url
    raise ValueError("No application found.")
ValueError: No application found.

As I understand, the exception of type "IUnauthorized" is thrown. Then my custom view for that exception is evaluated and failed on path expression: ${view/application_url}/offers?offertype=sale&realtytype=apartment. I discovered that exception with value "ValueError: No application found." is rased in function application_url(). I understand that there is no application created, but I can not create one, if I can not login to Grok administrator. I understand that this is because my custom exception view somehow replaced default view that popups login form.

Please can someone tell me how to properly use custom exception views ?

Thank in advance for any help,
Roman Lacko

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