counting values using count function

Question

i have the following template namely index.html.I am working in django framework.Now i have shown the value where the all speed of a car is more than 30km.I just posted here the part of the associated code which output the value,that is,the code is

{% for v in values %}
      {% if v.speed > 30 %}
        {{v.speed}}
      {% endif %}
{% endfor %}

now i just want to count the v.speed values,how can i do that using python or django count function.You can edit my code in that section.

Thank You.

Bulkan · Accepted Answer · 2013-11-10 10:22:12Z

1

If values is a Django QuerySet you can just use .count()

{% for v in values %}
  {% if v.speed > 30 %}
    {{v.speed}}
  {% endif %}
{% endfor %}

{{values.count}}

You can also use {{values|length}}

answered Nov 10, 2013 at 10:22

Bulkan

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shad0w_wa1k3r · Accepted Answer · 2013-11-10 10:30:31Z

1

Variable assignment is not allowed in django. So, your only alternative is do the counting in python itself & pass the corresponding data to the template.

Thus, you should do the following in python

speedy_values = [v for v in values if v.speed > 30]

And then, pass the speedy_values to your template

{% for v in speedy_values %}
      {{v.speed}}
{% endfor %}
{{ v|length }} number of cars have speed greater than 30.

answered Nov 10, 2013 at 10:30

shad0w_wa1k3r

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Comments

Maciej Gol · Accepted Answer · 2013-11-10 11:39:14Z

0

Alternatively, since your QuerySet has been already evaluated, using the length filter would save you an additional query:

{% for v in values %}
  {% if v.speed > 30 %}
    {{v.speed}}
  {% endif %}
{% endfor %}

{{values|length}}

Documentation.

answered Nov 10, 2013 at 11:39

Maciej Gol

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