[Django]-How to use django-bootstrap3

Add {% load bootstrap3 %} to child template file after the {% extends 'site_base.html' %}.

[Django]-Null value in column "user_id" violates not-null constraint in Django 1.9

Did you put it inside <form> tags ?

This is how your bootstrap form should look (from django-bootstrap3 github page) like:

<form action="/url/to/submit/" method="post" class="form">
    {% csrf_token %}
    {% bootstrap_form form %}
    {% buttons %}
        <button type="submit" class="btn btn-primary">
            {% bootstrap_icon "star" %} Submit
        </button>
    {% endbuttons %}
</form>

Hosni