The counter initializes the variable to 0, and next it increments one by one: {% load counter_tag %} {% for pet in pets %} {% if pet.is_cat %} {% counter cats %} {% else %} {% counter dogs %} {% endif %} {% endfor %} # cats: {{cats}} # dogs: {{dogs}}
This patch adds a new admin Filter, for Filtering nullable fields. It adds 3 possible choices: 'All' (no filter), 'Null' (it applies field__isnull=True filter), and 'With Value' (it filters null values). This patch is interesting when you have a Integer or String fields and you want to filter wether a value is set or not. In other case, it would show too many filtering options. Remember this is a patch and you must modify a django file in `django/contrib/admin/filterspecs.py`