在Django模板过滤器中明确设置优先级

Question

Is there a way to set explicitly set precedence in Django template filters?

Like a sort of brackets system.

I'm trying to say

{{ label | default:( parameter | parse_label ) }}

A label is some human-friendly string like "Project ID" and a parameter is more like "project_id" .

I want a system where if a label isn't specifically provided, it runs the parse_label custom filter which returns a human-friendly version similar to the above - but at the moment, the code I have is running the parse_label filter regardless of whether a label is provided - presumably because it's doing something like this

{{ (label | default:parameter) | parse_label }}

Any ideas?

Answer 1

If I understand you correctly you can achieve this with the with tag.

{% with param=parameter|parse_label %}
    {{ label | default:param }}
{% endwith %}