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On my existing view I am trying to add filter view (by field "Sprint" in Issue - working in Issue model as foreign key). Below is my code:

#models.py


class Sprint(models.Model):
 sprint_type = models.TextField(default='Sprint', editable=False)
 name = models.TextField()
 goal = models.TextField()
 start_date = models.DateField()
 end_date = models.DateField()
 project = models.ForeignKey(Project, on_delete=models.CASCADE)

class Issue(models.Model):
 ISSUE_PRIORITY = (
 ('Critical', 'Critical'),
 ('High', 'High'),
 ('Medium', 'Medium'),
 ('Low', 'Low'),
 )
 issue_type = models.TextField(default='Issue', editable=False)
 issue_id = models.AutoField(primary_key=True)
 # slug = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
 date_created = models.DateTimeField(auto_now_add=True)
 date_updated = models.DateTimeField(auto_now=True)
 project = models.ForeignKey(Project, on_delete=models.CASCADE)
 title = models.CharField(max_length=128)
 description = models.TextField(null=True, blank=True)
 initiative = models.ForeignKey(Initiative, on_delete=models.CASCADE, null=True, blank=True)
 epic = models.ForeignKey(Epic, null=True, blank=True, on_delete=models.CASCADE)
 sprint = models.ForeignKey(Sprint, on_delete=models.CASCADE, null=True, blank=True)
 priority = models.CharField(max_length=8, choices=ISSUE_PRIORITY, default='M')

I am using django-filter library.

#filters.py
import django_filters
from .models import Issue

class BacklogFilter(django_filters.FilterSet):
 sprint = django_filters.CharFilter(lookup_expr='icontains')

 class Meta:
 model = Issue
 fields = ['sprint']

Using class-based view, I defined:

class ProjectBacklogView(DetailView):
 model = Project
 template_name = 'project-backlog.html'
 context_object_name = 'backlog'


 @method_decorator(login_required)
 def dispatch(self, request, *args, **kwargs):
 return ListView.dispatch(self, request, *args, **kwargs)

 def get_queryset(self):
 try:
 self.filter = BacklogFilter(self.request.GET, queryset=Issue.objects.all())
 return self.filter
 except:
 return Issue.objects.all()

 def get_context_data(self, **kwargs):
 context = super(ProjectBacklogView, self).get_context_data(**kwargs)
 context['project'] = Project.objects.all()
 context['issue'] = Issue.objects.all()
 # context['epic'] = Epic.objects.all()
 # context['initiative'] = Initiative.objects.all()
 context['sprint'] = Sprint.objects.all()
 context['filter_form'] = self.filter.form.as_table

 return context

In urls.py:

path('<str:pk>/backlog/', ProjectBacklogView.as_view(), name='project-backlog'),
path('<str:pk>/backlog/(w+)/', ProjectBacklogView.as_view(), name='project-backlog-filter'),

And last not least, the template:

% extends 'base-project.html' %

% block content %

<div class="container-fluid">

 <div id="simpleList" class="list-group">
 % for issue in backlog.issue_set.all %
 <div class="list-group-item">
 <div style="float:left;"><strong><a href="% url 'issue-edit' issue.pk %"> issue.title </a></strong></div>
 <div style="float: right;"><a href="#" class="btn btn-success btn-circle btn-sm"><i class="fas"> issue.remaining_estimate </i></a></div>
 <br /><br /><hr style="border-top: dashed 1px;"></hr>
 <div style="float: left;"><small>Assignee: <strong> issue.assignee </strong></small></div>
 <div style="float: right;"><small>Initiative: <strong> issue.initiative </strong></small></div><br />
 <div style="float: left;"><small>Priority: <strong> issue.priority </strong></small></div>
 <div style="float: right;"><small>Epic: <strong> issue.epic </strong></small></div>

 </div>
 % endfor %
 </div>

 <!-- Filters form-->
 <div>
 <form action="" method="get" class="filter-form">
 <table>
 filter_form 
 </table>
 <input type="submit" value="Szukaj" />
 <a class="reset-form" href="% url 'project-backlog' project.pk %">Clean filters</a>
 </form>
 </div>
</div>

My issue is, that I receive error about "no attribute 'filter' in BacklogFilter. Also I am concerned about urls routing - my case is that I would like on currently existing view display user filtering form and after apply selected filter, limit the elements displayed on view accordingly to selected/applied filter. How can I achieve that? I read tons of manuals but always I find out case, that user has filtering form and after sending the form, user is redirected to completely different page :(

Many thanks in advance for your help, I know I have still a lot to learn..