add custom filter that has a default field

jdav_web/members/admin.py

@@ -21,13 +21,52 @@ from django.conf import settings
 from easy_select2 import apply_select2
 
 
+class RegistrationFilter(admin.SimpleListFilter):
+    title = _('Registration complete')
+    parameter_name = 'registered'
+    default_value = ('All', None)
+
+    def lookups(self, request, model_admin):
+        return (
+            ('True', _('True')),
+            ('False', _('False')),
+            ('All', _('All'))
+        )
+
+    def queryset(self, request, queryset):
+        if self.value() == 'True':
+            return queryset.filter(registered=True)
+        elif self.value() == 'False':
+            return queryset.filter(registered=False)
+        elif self.value() is None:
+            if self.default_value[1] is None:
+                return queryset
+            else:
+                return queryset.filter(registered=self.default_value[1])
+        elif self.value() == 'All':
+            return queryset
+
+    def choices(self, cl):
+        for lookup, title in self.lookup_choices:
+            yield {
+                'selected':
+                    self.value() == lookup or
+                    (self.value() is None and lookup == self.default_value[0]),
+                'query_string': cl.get_query_string({
+                                    self.parameter_name:
+                                    lookup,
+                                }, []),
+                'display': title
+            }
+
+
 # Register your models here.
 class MemberAdmin(admin.ModelAdmin):
     fields = ['prename', 'lastname', 'email', 'email_parents', 'street', 'town', 'phone_number', 'phone_number_parents', 'birth_date', 'group',
               'gets_newsletter', 'registered', 'registration_form', 'comments']
     list_display = ('name', 'birth_date', 'get_group', 'gets_newsletter',
                     'registered', 'created', 'comments')
-    list_filter = ('group', 'gets_newsletter', 'registered')
+    list_filter = ('group', 'gets_newsletter', RegistrationFilter)
     formfield_overrides = {
         ManyToManyField: {'widget': forms.CheckboxSelectMultiple},
         ForeignKey: {'widget': apply_select2(forms.Select)}

jdav_web/members/locale/de/LC_MESSAGES/django.po

@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2017-10-11 11:50+0200\n"
+"POT-Creation-Date: 2017-10-11 12:34+0200\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -18,19 +18,35 @@ msgstr ""
 "Content-Transfer-Encoding: 8bit\n"
 "Plural-Forms: nplurals=2; plural=(n != 1);\n"
 
-#: admin.py:59
+#: admin.py:25 models.py:67
+msgid "Registration complete"
+msgstr "Anmeldung vollständig"
+
+#: admin.py:31
+msgid "True"
+msgstr "Ja"
+
+#: admin.py:32
+msgid "False"
+msgstr "Nein"
+
+#: admin.py:33
+msgid "All"
+msgstr "Alle"
+
+#: admin.py:98
 msgid "Difficulty"
 msgstr "Schwierigkeit"
 
-#: admin.py:63
+#: admin.py:102
 msgid "Tour type"
 msgstr "Art der Tour"
 
-#: admin.py:200
+#: admin.py:239
 msgid "Convert to PDF"
 msgstr "Kriseninterventionsliste erstellen"
 
-#: admin.py:306
+#: admin.py:345
 msgid "Generate overview"
 msgstr "Hinweise für Jugendleiter erstellen"
 
@@ -114,10 +130,6 @@ msgstr "Kommentare"
 msgid "created"
 msgstr "erstellt"
 
-#: models.py:67
-msgid "Registration complete"
-msgstr "Anmeldung vollständig"
-
 #: models.py:68
 msgid "registration form"
 msgstr "Anmeldeformular"