[Django]-Django template: check for empty query set

Have a look at the {% empty %} tag.
Example from the documentation

<ul>
{% for athlete in athlete_list %}
    <li>{{ athlete.name }}</li>
{% empty %}
    <li>Sorry, no athletes in this list.</li>
{% endfor %}
</ul>

Link: https://docs.djangoproject.com/en/1.8/ref/templates/builtins/#for-empty

If you are interested in a table, or some kind of heading if there are results, add the forloop.first:

{% for athlete in athlete_list %}
{% if forloop.first %}
Athlete Name:
{% endif %}
• {{ athlete.name }}

{% empty %}

• Sorry, no athletes in this list.

{% endfor %}

Try {% if notes.all %}. It works for me.

It’s unfortunate that you’re stuck using a raw query set – they’re missing a lot of useful behavior.

You could convert the raw query set into a list in the view:

notes_as_list = list(notes)
return render_to_response(template, {"notes":notes_as_list},context_instance=RequestContext(request))

Then check it as a boolean in the template:

{% if notes %}
    Header
    {% for note in notes %}
        {{ note.text }}
    {% endfor %}
{% endif %}

You could also make it happen without conversions using forloop.first:

{% for note in notes %}
    {% if forloop.first %}
         Header
    {% endif %}
    {{ note.text }}
{% endfor %}

In your view check whether notes is empty or not. If it is then you pass None instead:

{"notes": None}

In your template you use {% if notes %} as normal.

What about:

{% if notes != None %}
    {% if notes %}
        NOTES:
        {% for note in notes %}
            {{ note.text }}  
        {% endfor  %}
    {% endif %}
{% else %}
    NO NOTES AT ALL
{% endif %}

Your original solution

{% if notes %}
    Header
    {% for note in notes %}
        {{ note.text }}
    {% endfor %}
{% endif %}

Works now with Django 1.7 and thanks to QuerySet caching, it does not cost and extra query.

Often the right way to do this is to use the {% with ... %} tag. This caches the query so it runs only once and also gives you more flexibility with your markup than using {% empty %}.

{% with notes as my_notes %}
{% if my_notes %}
<ul>
  {% for note in my_notes %}
  <li>{{ note }}</li>
  {% endfor %}
</ul>
{% else %}
<p>Sorry, no notes available</p>
{% endif %}
{% endwith %}

With this particular example I’m not sure how useful it is but if you’re querying Many-to-Many field, for instance, it’s likely what you want to do.

Use {% empty %} in django templates

{% if list_data %}
    {% for data in list_data %}
        {{ data.field_1 }}
    {% endfor %}
{% else %}
    <p>No data found!</p>
{% endif %}

We can write above code with {% empty %}.

{% for data in list_data %}
    {{ data.field_1 }}
{% empty %}
    <p>No data found!</p>
{% endfor %}

you can use the {% empty %} for a "for loop" as in:

{% for object in list %}
<p>{{ object }}</p>
{% empty %}
<p>list is empty</p>
{% endfor %}

use ‘.all’

{% if object.something.all %}