The NoReverseMatch error in Django updateView - django

Question

I am writing and Update View for a model that I have created. The model is a Product Backlog Item. The UpdateView is unable to find a reverse match for my view.
The NoReverseMatch error is saying that Django cannot find a matching url pattern.
My code as below:
UpdatePBI View
class updatePBI(LoginRequiredMixin, UpdateView):
pk_url_kwarg = 'pbipk'
kwargs={'pk_url_kwarg': 'pbipk'}
model = PBI
fields = ['priority', 'summary', 'story_points', 'effort_hours']
login_url = '/accounts/login'
redirect_field_name = '/home'
template_name = 'backtrack/PBIdetail.html'
def dispatch(self, request, *args, **kwargs):
print(kwargs)
return super().dispatch(request, *args, **kwargs)
def get_success_url(self):
return "{}?all=0".format(reverse('pb', kwargs={'pk': self.kwargs['pk']}))
def get_object(self, queryset=None):
obj = get_object_or_404(self.model,pk=self.kwargs['pbipk'])
return obj
def form_valid(self, form):
PBIList = getPBIfromProj(self.kwargs['pk'], '0')
remove = []
priorityData = form.cleaned_data['priority']
if int(priorityData) < self.object.priority:
# Remove all PBI with priority higher than post data priority
# and lesser or equal than current PBI priority
for PBIObj in PBIList:
if PBIObj.priority < int(priorityData) or PBIObj.priority >= self.object.priority:
remove.append(PBIObj.priority)
PBIList = [
PBIObj for PBIObj in PBIList if PBIObj.priority not in remove]
# Increase each objects priority by one
for PBIObj in PBIList:
PBIObj.priority += 1
PBIObj.save()
else:
# Remove all PBI with priority higher than post PBI priority
# and lesser than and equal to Post data priority
for PBIObj in PBIList:
if PBIObj.priority <= self.object.priority or PBIObj.priority > int(priorityData):
remove.append(PBIObj.priority)
PBIList = [
PBIObj for PBIObj in PBIList if PBIObj.priority not in remove]
# Decrease each objects priority by one
for PBIObj in PBIList:
PBIObj.priority -= 1
PBIObj.save()
return super().form_valid(form)
model.py
from django.urls import reverse
# Create your models here.
class PBI(models.Model):
status = models.CharField(max_length=1,
choices=[("N", "Not Done"), ("P", "In Progress"), ("D", "Done")], default="N")
story_points = models.FloatField()
effort_hours = models.FloatField()
summary = models.TextField(default = None)
priority = models.IntegerField(default=0)
Project = models.ForeignKey('Project', on_delete=models.CASCADE, related_name='pbi')
def __str__(self):
return self.summary
class Meta:
db_table = "PBI"
verbose_name = 'PBI'
verbose_name_plural = 'PBIs'
class Project(models.Model):
name = models.CharField(max_length=256)
def __str__(self):
return self.name
class Meta:
db_table = "Project"
urls.py
from django.conf.urls import url
from backtrack import views
from django.shortcuts import redirect
urlpatterns = [
path('', lambda x: redirect('1/'),name='home'),
path('<int:pk>/', views.HomeView.as_view(),name = 'home-project'),
path('<int:pk>/pb/', views.ProductBacklogView.as_view(),name='pb'),
path('<int:pk>/pb/add/', views.AddPBI.as_view(),name='add'),
path('<int:pk>/pb/<int:pbipk>/update', views.updatePBI.as_view(),name='detail'),
path('<int:pk>/pb/<int:pbipk>/delete', views.DeletePBI.as_view(),name='delete')
]
Product Backlog Page
{% block content %}
<h1 class="page-header"><i class="fa fa-file"></i> Product BackLog</h1>
<div class="row placeholders"></div>
{% if data|length == 0 %}
<h4>There are no PBIs</h4>
{% endif %}
<h2 class="sub-header">
<div class="dropdown">
<button class="btn btn-light dropdown-toggle pull-left" type="button" data-toggle="dropdown" style="margin-bottom: 10px;">Filter By
<span class="caret"></span></button>
<ul class="dropdown-menu">
<li>Priority</li>
<li>Story Points</li>
<li>Effort Hours</li>
</ul>
<div class="btn-group btn-toggle">
<button class="btn btn-xs btn-primary active toggle">NOT DONE</button>
<button class="btn btn-xs btn-default toggle">ALL</button>
</div>
<button type="button" class="btn btn-light" style="margin-bottom: 10px;"><i class="fa fa-plus" id="A"></i>ADD</button>
<button type="button" class="btn btn-light" style="margin-bottom: 10px;"><i class="fa fa-times" id="A"></i>DELETE</button>
</div>
</h2>
<div class="table-responsive">
<table class="table table-striped">
<thead>
<tr>
<th> </th>
<th>Priority</th>
<th>Summary</th>
<th>Status</th>
<th>Story Points</th>
<th>Cumulative Story Points</th>
<th>Effort hours</th>
<th>Cumulative Effort hours</th>
</tr>
</thead>
<tbody>
{% for PBI in data %}
<tr>
<td><input type="checkbox"></td>
<td>
{% if PBI.status == "N" %}
{{PBI.priority}}
{% else %}
--
{% endif %}
</td>
<td><a style="text-decoration: none; color: cornflowerblue;" href={% url 'detail' pk=1 pbipk=PBI.id %}>{{PBI.summary}}</a></td>
<td>
{% if PBI.status == "N" %}
Not Done
{% elif PBI.status == "P" %}
In Progress
{% else %}
Done
{% endif %}
</td>
<td>{{PBI.story_points}}</td>
<td>{{PBI.sum_story_points}}</td>
<td>{{PBI.effort_hours}}</td>
<td>{{PBI.sum_effort_hours}}</td>
</tr>
{% endfor %}
</tbody>
</table>
</div>
<script>
$.urlParam = function (name) {
var results = new RegExp('[\?&]' + name + '=([^&#]*)')
.exec(window.location.search);
return (results !== null) ? results[1] || 0 : false;
}
$(document).ready(function () {
if($.urlParam('all') == '1'){
$(this).find('.toggle').toggleClass('active');
if ($(this).find('.btn-primary').length>0) {
$(this).find('.toggle').toggleClass('btn-primary');
}
}
var getUrl = window.location;
var baseUrl = getUrl.protocol + "//" + getUrl.host + getUrl.pathname;
$('.btn-toggle').click(function(){
console.log($.urlParam('all') == '0')
if($.urlParam('all') == '0')
window.location.replace(baseUrl + "?all=1");
else
window.location.replace(baseUrl + "?all=0");
})
});
</script>
{% endblock content %}
I am getting this error
NoReverseMatch at /home/1/pb/50/update
Reverse for 'detail' with keyword arguments '{'pk': 1, 'pbipk': ''}' not found. 1 pattern(s) tried: ['home/(?P<pk>[0-9]+)/pb/(?P<pbipk>[0-9]+)/update$']
Update
I have found that the error is because I am setting the form action with the PBI.id but the Update view is not passing a PBI to my template. How do I fix this?

Answer 1

Okay. I found what I was doing wrong. I have to override the get_context_data() function of the template view mixin and pass the PBI in the context after calling super().get_context_data(form).