Question

I would like to print information about all my users and their groups in a template, like this:

        {% for user in users %}
        <tr>
          <td>(there should be enumerate here - 1,2,3,4 etc...)</td>
          <td>{{ user.last_name }}</td>
          <td>{{ user.first_name }}</td>
          <td>
          {% for group in user.groups %}
          {{ group }}, </td>
          {% endfor %}
        </tr>
        {% endfor %}

but it doesn’t work:

‘ManyRelatedManager’ object is not iterable

I have two additional questions:
1. How can I easily enumerate users, like this:

    <tr>
      <td>1</td>
      <td>Kowalski</td>
      <td>John</td>
      ...
    </tr>
    <tr>
      <td>2</td>
      <td>Smith</td>
      <td>John</td>
      ...
    </tr>
         ...

2. How can I print groups like this:

group1, group2, group3

instead

group1, group2, group3,
(last comma is wrong)

Thank you very much.

Answer 1

The following code should do everything you are asking for:

{% for user in users %}
    <tr>
        <td>{{ forloop.counter }}</td>
        <td>{{ user.last_name }}</td>
        <td>{{ user.first_name }}</td>
        <td>
            {% for group in user.groups.all %}
                {{ group }}
                {% if not forloop.last %},{% endif %} 
            {% endfor %}
        </td>
    </tr>
{% endfor %}

Check out the following link from the official docs for more information about builtin forloop variables: https://docs.djangoproject.com/en/dev/ref/templates/builtins/#for