New Written Django Manager is not working in the template

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I have a simple todolist app where each task has a Booleanfield called is_deleted. in my list template, I only want to show the tasks with is_deleted=False .

I know I can use Task.objects.all().filter(is_deleted=False) in my view; but I want to do it with managers in my template. here is my manager:

    class TaskManager(models.Manager):
        def available(self):
            return self.filter(is_deleted=False)
              .
              .
     objects = TaskManager()

here is my view:

class TaskList(ListView):
    model = models.Task
    context_object_name="tasks"
    template_name = "home/list.html"
    paginate_by=5

and here is the the condition in my template:

 {% if tasks.available%} ...
templates view django python
1 Answers

My answer is a complement / a correction of your work :

  • Your manager is ok

  • But you need to specify in the Task model that you override the default manager by the your custom manager like this :

      Class Task(models.Model):
      # others fields here

      # override the default objects manager
      objects = TaskManager()
      # You can also define a new manager and keep the default objects, in the case you will use it later.
      # objects = models.Manager() -> Task.objects.all() give all objects
      # is_available = TaskManager() -> Task.is_available.all() give only nt deleted task.

  • in your views.py

      class TaskList(ListView):
      model = models.Task
      context_object_name="tasks"
      template_name = "home/list.html"
      paginate_by=5

      # If you override the default objects manager with TaskManager
      # Then you are nothing to do, {{ tasks }} is the queryset in the template

      # If you defined two managers as recommended above, then you need
      # to override the queryset attribute of the ListView
      queryset = Task.is_available.all()  # Explicit call of custom manager

  • Anyways in your template, you don't need {% if %} tag to filter results, all your task are available on the context_object_name value name.

      {% for task in tasks %}
  {{ task.name }}
  ...
  {% endfor %}
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