Bug 728441 - kobo.django.menu.MainMenu doesn't work with Django 1.3
Summary: kobo.django.menu.MainMenu doesn't work with Django 1.3
Alias: None
Product: Fedora
Classification: Fedora
Component: kobo
Version: 19
Hardware: Unspecified
OS: Unspecified
Target Milestone: ---
Assignee: Daniel Mach
QA Contact: Fedora Extras Quality Assurance
Depends On:
Blocks: 728448
TreeView+ depends on / blocked
Reported: 2011-08-05 07:56 UTC by Martin Magr
Modified: 2015-02-18 11:20 UTC (History)
1 user (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2015-02-18 11:20:22 UTC
Type: ---

Attachments (Terms of Use)
MainMenu patch (1.69 KB, patch)
2011-08-05 18:56 UTC, Martin Magr
no flags Details | Diff

Description Martin Magr 2011-08-05 07:56:28 UTC
MainMenu object is not rendered properly in Django 1.3 templates.

Comment 1 Martin Magr 2011-08-05 10:39:42 UTC
So the problem is that: 'MainMenu' object has no attribute 'alters_data'.

From my investigation in Django source code and documentation:

Changed in Django 1.3: Previously, only variables that originated with an attribute lookup would be called by the template system. This change was made for consistency across lookup types.
A variable can only be called if it has no required arguments. Otherwise, the system will return an empty string. Obviously, there can be side effects when calling some variables, and it'd be either foolish or a security hole to allow the template system to access them.

More info here: https://docs.djangoproject.com/en/1.3/ref/templates/api/#rendering-a-context

Unfortunately, even adding 'self.alters_data = False' attribute to MainMenu and/or Menu class, didn't solve the problem (only exception is not raise, but menu is still not rendered). I'm going to further investigate.

Comment 2 Martin Magr 2011-08-05 11:26:37 UTC
Menu rendering could be fixed with making MainMenu _not_ callable. Which means moving operations from __call__ to (for example) LazyMenu.__get__. But this is only workaround, which doesn't solve the cause of the problem.

Do you want me to write such a patch?

Comment 3 Daniel Mach 2011-08-05 13:03:01 UTC
(In reply to comment #2)
> Menu rendering could be fixed with making MainMenu _not_ callable. Which means
> moving operations from __call__ to (for example) LazyMenu.__get__. But this is
> only workaround, which doesn't solve the cause of the problem.
> Do you want me to write such a patch?

Even a hack is definitely better than nothing.
But if you can write something which is not a workaround, please do so.

Comment 4 Martin Magr 2011-08-05 18:56:44 UTC
Created attachment 516937 [details]
MainMenu patch

Attached is the patch. I think that it would not be possible to preserve MainMenu as callable object. According to Django 1.3 documentation every callable variable in templates must not accept any attribute.

Comment 5 Daniel Mach 2011-08-23 11:33:12 UTC
pushed to git

Comment 6 Martin Magr 2012-12-19 15:37:14 UTC
Setting to VERIFIED since we use MainMenu successfully with Django-1.3

Comment 7 Fedora End Of Life 2013-04-03 20:39:39 UTC
This bug appears to have been reported against 'rawhide' during the Fedora 19 development cycle.
Changing version to '19'.

(As we did not run this process for some time, it could affect also pre-Fedora 19 development
cycle bugs. We are very sorry. It will help us with cleanup during Fedora 19 End Of Life. Thank you.)

More information and reason for this action is here:

Comment 8 Fedora End Of Life 2015-01-09 22:41:28 UTC
This message is a notice that Fedora 19 is now at end of life. Fedora 
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Comment 9 Fedora End Of Life 2015-02-18 11:20:22 UTC
Fedora 19 changed to end-of-life (EOL) status on 2015-01-06. Fedora 19 is
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