Initial version of the GridFS storage driver

apps/documents/metadata.py

@@ -0,0 +1,54 @@
+from urllib import unquote_plus
+
+from django.shortcuts import get_object_or_404
+from django.core.exceptions import ObjectDoesNotExist
+
+
+from models import DocumentMetadata, MetadataType
+
+def decode_metadata_from_url(url_dict):
+    metadata_dict = {
+        'id':{},
+        'value':{}
+    }
+    metadata_list = []
+    #Match out of order metadata_type ids with metadata values from request
+    for key, value in url_dict.items():
+        if 'metadata' in key:
+            index, element = key[8:].split('_')
+            metadata_dict[element][index] = value
+        
+    #Convert the nested dictionary into a list of id+values dictionaries
+    for order, id in metadata_dict['id'].items():
+        if order in metadata_dict['value'].keys():
+            metadata_list.append({'id':id, 'value':metadata_dict['value'][order]})
+
+    return metadata_list
+    
+    
+def save_metadata_list(metadata_list, document):
+    for item in metadata_list:
+        if item['value']:
+            save_metadata(item, document)
+        else:
+            try:
+                metadata_type = MetadataType.objects.get(id=item['id'])
+                document_metadata = DocumentMetadata.objects.get(document=document,
+                    metadata_type=metadata_type)
+                document_metadata.delete()
+            except ObjectDoesNotExist:
+                pass
+                        
+        
+def save_metadata(metadata_dict, document):
+    #Use matched metadata now to create document metadata
+    document_metadata, created = DocumentMetadata.objects.get_or_create(
+        document=document,
+        metadata_type=get_object_or_404(MetadataType, pk=metadata_dict['id']),
+    )
+    #Handle 'plus sign as space' in the url
+    
+    #unquote_plus handles utf-8?!?
+    #http://stackoverflow.com/questions/4382875/handling-iri-in-django
+    document_metadata.value=unquote_plus(metadata_dict['value'])#.decode('utf-8')
+    document_metadata.save()