--- a/src/iconolab/management/commands/importimages.py	Sun Jun 24 02:24:02 2018 +0200
+++ b/src/iconolab/management/commands/importimages.py	Tue Jun 26 16:06:53 2018 +0200
@@ -22,7 +22,7 @@
             metadata_dict,
             image_files,
             options,
-            source_dir
+            source_dir,
     ):
 
         target_dir = os.path.join(settings.MEDIA_ROOT, Image.media.field.upload_to)
@@ -47,9 +47,9 @@
                 print('##### Copying file '+str(image)+' without converting')
                 image_path = os.path.join(target_dir, image)
                 new_image_name = image
-                shutil.copy(os.path.join(source_dir, image), target_dir)
+                shutil.copy(os.path.join(source_dir, image), image_path)
                 try:
-                    im = ImagePIL.open(os.path.join(target_dir, image))
+                    im = ImagePIL.open(image_path)
                     im_width, im_height = im.size
                 except Exception as e:
                     print(e)

--- a/src/iconolab/models.py	Sun Jun 24 02:24:02 2018 +0200
+++ b/src/iconolab/models.py	Tue Jun 26 16:06:53 2018 +0200
@@ -134,6 +134,10 @@
     """
     metadata = models.TextField(default="", null=False)
 
+    @staticmethod
+    def get_natural_key(collection, raw_natural_key):
+        return '%s|%s' % (collection.name, raw_natural_key)
+
     def __init__(self, *args, **kwargs):
         self.__metadata_obj = None
         self.__raw_natural_key = None

--- a/src/iconolab/search_indexes/urls.py	Sun Jun 24 02:24:02 2018 +0200
+++ b/src/iconolab/search_indexes/urls.py	Tue Jun 26 16:06:53 2018 +0200
@@ -5,8 +5,8 @@
 
 app_name = "iconolab-search_indexes"
 urlpatterns = [
-    url(r'collection/(?P<collection_name>[a-z0-9\-]+)/model/(?P<model_type>[a-z0-9\-]+)', views.IconolabSearchView.as_view(), name="collection_with_model_search"),
-    url(r'collection/(?P<collection_name>[a-z0-9\-]+)', views.IconolabSearchView.as_view(), name="collection_search"),
+    url(r'collection/(?P<collection_name>[a-zA-Z0-9\-]+)/model/(?P<model_type>[a-z0-9\-]+)', views.IconolabSearchView.as_view(), name="collection_with_model_search"),
+    url(r'collection/(?P<collection_name>[a-zA-Z0-9\-]+)', views.IconolabSearchView.as_view(), name="collection_search"),
     url(r'^model/(?P<model_type>[a-z0-9\-]+)', views.IconolabSearchView.as_view(), name="model_search"),
     url(r'^global/$', views.IconolabSearchView.as_view(), name="global_search"),
 ]