add photo url on contacts API

picampaign/campaign/serializers.py

@@ -25,8 +25,9 @@ class CampaignContactSerializer(serializers.HyperlinkedModelSerializer):
     phone = serializers.Field(source='contact.phone')
     groups = GroupSerializer(many=True, source='contact.groups')
     contact_id = serializers.Field(source='contact.id')
+    photo = serializers.Field(source='contact.get_photo_url')
 
     class Meta:
         model = CampaignContact
         fields = ('id', 'weight', 'contact_id',
-                  'first_name', 'last_name', 'phone', 'groups')
+                  'first_name', 'last_name', 'phone', 'groups', 'photo')

picampaign/contact/models.py

@@ -15,3 +15,8 @@ class Contact(models.Model):
     def __unicode__(self):
         return _('%(firstname) %(lastname)') % {'firstname': self.first_name,
                                                 'lastname': self.last_name}
+
+    def get_photo_url(self):
+        if self.photo:
+            return self.photo.url
+        return u''