implemented cancel subscription, will likely need some more work and testing

config/urls.py

@@ -35,6 +35,7 @@ urlpatterns = [
     url(r'^latest/$', LatestEntriesFeed()),
 
     url(r'membership/join/$', subscription.MembershipJoinView.as_view(), name='join_hackspace'),
+    url(r'membership/cancel/$', subscription.MembershipCancelView.as_view(), name='cancel_membership'),
     url(r'membership/(?P<provider>[\w\-]+)/success$', subscription.MembershipJoinSuccessView.as_view(), name='join_hackspace_success'),
     url(r'membership/(?P<provider>\w{0,50})/failure$', subscription.MembershipJoinFailureView.as_view(), name='join_hackspace_failure'),
     url(r'^admin/password_reset/$', auth_views.password_reset, name='admin_password_reset'),

mhackspace/static/sass/components/_membership.scss

@@ -9,4 +9,12 @@
     margin: auto;
     text-shadow: 1px 1px #FFF;
     position: relative;
+    .middle {
+        font-size: 2rem;
+        text-align: center;
+        margin: 50px;
+    }
+    .date {
+        padding:14px;
+    }
 }

mhackspace/subscriptions/payments.py

@@ -101,9 +101,14 @@ class gocardless_provider:
     def get_token(self):
         return 'N/A'
 
-    def cancel_subscribe(self, reference):
+    def cancel_subscription(self, reference):
+        try:
             subscription = gocardless.client.subscription(reference)
             response = subscription.cancel()
+        except  gocardless.exceptions.ClientError:
+            return {
+                'success': False
+            }
         return {
             'amount': subscription.amount,
             'start_date': subscription.created_at,

mhackspace/subscriptions/views.py

@@ -9,11 +9,42 @@ from django.contrib import messages
 from django.contrib.auth.models import Group
 from django.contrib.auth.mixins import LoginRequiredMixin
 
-from mhackspace.users.models import User
+from mhackspace.users.models import User, Membership
+from mhackspace.users.models import MEMBERSHIP_CANCELLED
 from mhackspace.users.forms import MembershipJoinForm
 from mhackspace.subscriptions.payments import select_provider
 
 
+class MembershipCancelView(LoginRequiredMixin, RedirectView):
+    permanent = False
+    pattern_name = 'users:detail'
+
+    def get_redirect_url(self, *args, **kwargs):
+        payment_provider = 'gocardless'
+        provider = select_provider(payment_provider)
+
+        member = Membership.objects.filter(user=self.request.user).first()
+
+        result = provider.cancel_subscription(
+            reference=member.reference
+        )
+        if result.get('success') is True:
+            # set membership to cancelled on success
+            member.status = MEMBERSHIP_CANCELLED
+            member.save()
+
+            # remove user from group on success
+            group = Group.objects.get(name='members')
+            self.request.user.groups.remove(group)
+            messages.add_message(
+                self.request,
+                messages.SUCCESS,
+                'Your membership has now been cancelled')
+        
+        kwargs['username'] =  self.request.user.get_username()
+        return super(MembershipCancelView, self).get_redirect_url(*args, **kwargs)
+
+
 class MembershipJoinView(LoginRequiredMixin, UpdateView):
     model = User
     fields = []

mhackspace/templates/users/user_detail.html

@@ -31,11 +31,11 @@
         <div class="container">
           <div class="middle">
             <p>MHS{{ user.id|stringformat:"05d" }}</p><p>{{user.name}}{{user.last_name}}</p>
-          <a href="/profile/membership/cancel">Cancel Membership</a>
+          </div>
+          <a href="{% url 'cancel_membership' %}">Cancel Membership</a>
         </div>
       </div>
-    </div>
+    {% else %}
-    {% endif %}
       <div>
         <h2>Sign up below</h2>
         <form method="POST" action="{% url 'join_hackspace' %}" class="contact_us_form">
@@ -44,6 +44,7 @@
           <button class="btn btn-primary" type="submit" name="action">{% trans "Send" %}</button>
         </form>
       </div>
+    {% endif %}
   </div>
 </div>
 

mhackspace/users/admin.py

@@ -1,20 +1,19 @@
 # -*- coding: utf-8 -*-
 from __future__ import absolute_import, unicode_literals
 
+from django.contrib.admin import ModelAdmin
 from django import forms
 from django.contrib import admin
 from django.contrib.auth.admin import UserAdmin as AuthUserAdmin
 from django.contrib.auth.forms import UserChangeForm, UserCreationForm
-from .models import User
+from .models import User, Membership, MEMBERSHIP_STATUS_CHOICES
 
 
 class MyUserChangeForm(UserChangeForm):
     class Meta(UserChangeForm.Meta):
         model = User
 
-
 class MyUserCreationForm(UserCreationForm):
-
     error_message = UserCreationForm.error_messages.update({
         'duplicate_username': 'This username has already been taken.'
     })
@@ -40,3 +39,8 @@ class MyUserAdmin(AuthUserAdmin):
     ) + AuthUserAdmin.fieldsets
     list_display = ('username', 'name', 'is_superuser')
     search_fields = ['name']
+
+@admin.register(Membership)
+class MembershipAdmin(ModelAdmin):
+    list_display = ('user', 'payment', 'date', 'status')
+    list_filter = ('status',)

mhackspace/users/models.py

@@ -33,6 +33,14 @@ class Blurb(models.Model):
     skills = models.CharField(max_length=255)
     description = models.TextField()
 
+MEMBERSHIP_CANCELLED = 0
+
+MEMBERSHIP_STATUS_CHOICES = (
+    (0, 'Guest user'),
+    (1, 'Active membership'),
+    (3, 'Membership Expired'),
+    (4, 'Membership Cancelled')
+)
 
 MEMBERSHIP_STRING = {
     0: 'Guest user',
@@ -55,7 +63,7 @@ class Membership(models.Model):
     payment = models.DecimalField(max_digits=6, decimal_places=2, default=0.0)
     date = models.DateTimeField() 
     reference = models.CharField(max_length=255)
-    status = models.PositiveSmallIntegerField(default=0)
+    status = models.PositiveSmallIntegerField(default=0, choices=MEMBERSHIP_STATUS_CHOICES)
     email = models.CharField(max_length=255)
 
     @property