Improve payment admin page

Signed-off-by: Emmy D'Anello <emmy.danello@animath.fr>

registration/admin.py

@@ -96,7 +96,11 @@ class VolunteerRegistrationAdmin(PolymorphicChildModelAdmin):
 
 @admin.register(Payment)
 class PaymentAdmin(ModelAdmin):
-    list_display = ('registration', 'type', 'valid', )
+    list_display = ('registration', 'registration_type', 'type', 'valid', )
     search_fields = ('registration__user__last_name', 'registration__user__first_name', 'registration__user__email',)
-    list_filter = ('type', 'valid',)
+    list_filter = ('registration__team__participation__valid', 'type', 'type', 'valid',)
     autocomplete_fields = ('registration',)
+
+    @admin.display(description=_('registration type'), ordering='registration__polymorphic_ctype')
+    def registration_type(self, record: Payment):
+        return record.registration.get_real_instance().type

registration/models.py

@@ -370,7 +370,7 @@ class Payment(models.Model):
     )
 
     valid = models.BooleanField(
-        verbose_name=_("valid"),
+        verbose_name=_("payment valid"),
         null=True,
         default=False,
     )