add group to list display in member app

jdav_web/members/admin.py

@@ -22,7 +22,8 @@ from .models import (Member, Group, MemberList, MemberOnList, Klettertreff,
 class MemberAdmin(admin.ModelAdmin):
     fields = ['prename', 'lastname', 'email', 'street', 'town', 'phone_number', 'phone_number_parents', 'birth_date', 'group',
               'gets_newsletter', 'comments']
-    list_display = ('name', 'street', 'town', 'phone_number', 'phone_number_parents', 'birth_date', 'gets_newsletter', 'comments')
+    list_display = ('name', 'street', 'town', 'phone_number',
+            'phone_number_parents', 'birth_date', 'gets_newsletter', 'get_group', 'comments')
     list_filter = ('group', 'gets_newsletter')
 
 

jdav_web/members/models.py

@@ -47,6 +47,13 @@ class Member(models.Model):
     def name(self):
         """Returning whole name (prename + lastname)"""
         return "{0} {1}".format(self.prename, self.lastname)
+    
+    def get_group(self):
+        """Returns a string of groups in which the member is."""
+        groupstring = ''.join(g.name + ',\n' for g in self.group.all())
+        groupstring = groupstring[:-2]
+        return groupstring
+    get_group.short_description = _('Group')
 
     class Meta:
         verbose_name = _('member')