[jira] Commented: (TAPESTRY-2736) Ognl doesn't evaluate dynamic expressions correctly

["Greg Woolsey (JIRA)" <de...@tapestry.apache.org>]

    [ https://issues.apache.org/jira/browse/TAPESTRY-2736?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12778731#action_12778731 ] 

Greg Woolsey commented on TAPESTRY-2736:
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I believe I've seen this, didn't realize it was a bug, and found a workaround (thought I just didn't understand what OGNL was meant to do in these cases).

I found if I prefix a problematic method call with 

(#this)

so instead of:

content.domain[sharedPickerProperty]

you have:

content.domain[(#this).sharedPickerProperty]

it uses the current value instead of the initial value on each call.  I think the bug is still valid, it should notice changes to these properties, but using the above construct to force dynamic evaluation works for me in several complex scenarios, including a custom Contrib:Table interface implementation, where I use something like this in custom expression column classes to evaluate things like title attribute values on a cell by cell basis.

> Ognl doesn't evaluate dynamic expressions correctly
> ---------------------------------------------------
>
>                 Key: TAPESTRY-2736
>                 URL: https://issues.apache.org/jira/browse/TAPESTRY-2736
>             Project: Tapestry
>          Issue Type: Bug
>          Components: Framework
>    Affects Versions: 4.1.6
>         Environment: java 1.5, tomcat 5.5
>            Reporter: howard kelsey
>            Priority: Critical
>         Attachments: ognlTestCase.tar.gz
>
>
> Ognl doesn't evaluate dynamic expressions correctly anymore. 
> For instance if you have the ognl expression content.domain[sharedPickerProperty] where sharedPickerProperty is a property of the page that is updated during a For loop the value returned is always that of content.domain.'first value of sharedPickerProperty'. This used to work in tapestry 4.0.x.

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