Question

I’m using plone and trying to display a form result in a page template.

I’m trying to filter some database results using tal:condition with a python expression but it always evaluates to false.

The code looks like this:

 <tr tal:repeat="result view/results">
     <td> <span tal:condition="python:view.teams[0]==result.team_id" tal:replace="result/position">Position</span></td>
     <td> <span tal:condition="python:view.teams[1]==result.team_id" tal:replace="result/position">Position</span></td>
</tr>

I want the table cells to be filled with the team position when the team id is matched in the result, but the cells always are empty.
If I remove the tal:condition from the span and replace the tal:replace="result/position" with tal:replace=python:view.teams[0]==result.team_id it prints True or False so I can check that the result is correct.

Can anyone help me about this issue? Why does tal:condition allways evaluate false?

Answer 1

I’d fully expect this to work, so something else must be wrong.

Python expressions such as yours are commonplace; there are several examples on the internet to show they do normally work.

Try further debugging the values with tal:replace="python:repr(view.teams)" and tal:replace="python:repr(result.team_id)" statements and similar to be 100% certain of what your data structures look like.