Question

The if in jinja2 is useful for know if a value is defined but I need to know if a query have results or not?
for example:

<thead>
{% if row in rows %} # this is a pseudo-code that i looking for
...
</thead>
<tbody>
{% for row in rows %}
...
</tbody>

rows is the result of a gql query where ‘no result’ is NULL but

{% if rows == NULL %}

or

{% if rows is none %}

don’t help me. I want to hide thead when tbody is empty.

Answer 1

Have you tried: {% if rows %}?

Edit: To keep thead from showing up for each row, put the if statement outside of your for loop. Something like:

{% if rows %}
<thead>
</thead>
{% endif %}

<tbody>
{% for row in rows %}
...
</tbody>