Question

I tried integer zero in a input field (IntegerField), however that zero never appears to be show after submit.

This is part of my template:

{{user_date_table.june_11}}
{% if not user_date_table.june_11_steps %}
 <form action="/steps_count/index/{{ username }}/table/" method="post">
  {% csrf_token %}              
  <input type="text" autocorrect="off" autocapitalize="off" name="june_11_steps"/>
  <input type="submit" value="Add"/>
 </form>
{% else %}      
 {{user_date_table.june_11_steps}}
{% endif %}

I think that if not user_date_table.june_11_steps throws “True”, i.e. it is blank if I use zero as input. Is this correct, and can I overcome this?

Answer 1

In python, all of the following are evaluated as False:

'', "", 0, [], {}, (), False, None 

So, user_date_table.june_11_steps is 0, then {% if not user_date_table.june_11_steps %} will be evaluated True and that block will be executed.

UPDATE: For solution,

1. If user_date_table do not take place in your context while you display the form, or if it is empty, you can use

   {% if not user_date_table%}
   

2. Pass another value to your template, like display_result, and use that to check which fieldset will be displayed.

views.py:

if request.POST: #saving the post data
    display_result = True

template.html

{% if not display_result %}
    <form action="/steps_count/inde...

But the first approach is always better.