Django: Get all objects from a specific user

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I have a problem when trying to display all the Announce objects from a user. My problem is : Consider that I am logged in as a user with an id=1. When I go to /users/1/ it displays all my posts. But the problem is when I want to display all the posts from another user with id=2 by going to /users/2/, it still display all my Announce objects, and not the user with the id=2.

models.py

class Announce(models.Model):
    owner        = models.ForeignKey('auth.User', related_name='announces')
    created_date = models.DateTimeField(auto_now_add=True)
    body         = models.TextField(max_length=1000)

views.py

class UserAnnouncesList(ListView):
    model = Announce
    template_name = 'myApp/user_announces_list.html'
    context_object_name = 'all_announces_by_user'

    def get_queryset(self):
        return Announce.objects.filter(owner=self.request.user)

urls.py

urlpatterns = [
url(r'users/(?P<pk>[0-9]+)/$', views.UserAnnouncesList.as_view(), name='user_announces_list'),]

user_announces_list.html

{% extends "account/base.html" %}

{% block content %}
{% for announce in all_announces_by_user %}
<h1>{{announce.user.username}}</h1>
    <p>{{announce.body}}</p>

{% endfor %}
{% endblock content %}

Do I have to use some kind of like : Announce.objects.get(pk=???) ?

I appreciate your help!

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On BEST ANSWER

The request.user is the user that is logged in. You need to use the pk that is passed as url. This is stored in the kwargs dictionary of the listview:

class UserAnnouncesList(ListView):
    model = Announce
    template_name = 'myApp/user_announces_list.html'
    context_object_name = 'all_announces_by_user'

    def get_queryset(self):
        return Announce.objects.filter(owner=self.kwargs['pk'])