Implement find_unique_values()

Previously it returned only a fixed set of values to satisfy the test suite.

2 files changed, 13 insertions, 1 deletions

diff --git a/gdatastore/datastore.py b/gdatastore/datastore.py
index 6f5a011..d1457aa 100644
--- a/gdatastore/datastore.py
+++ b/gdatastore/datastore.py
@@ -315,7 +315,10 @@ class InternalApi(object):
 
     def find_unique_values(self, query, name):
         logging.debug('find_unique_values(%r, %r)', query, name)
-        return ['org.sugarlabs.DataStoreTest1', 'org.sugarlabs.DataStoreTest2']
+        if query:
+            raise NotImplementedError('non-empty query not supported yet')
+
+        return self._index.find_unique_values(name)
 
     def save(self, tree_id, parent_id, metadata, path, delete_after, async_cb,
              async_err_cb):
diff --git a/gdatastore/index.py b/gdatastore/index.py
index 177a300..9b43541 100644
--- a/gdatastore/index.py
+++ b/gdatastore/index.py
@@ -304,6 +304,15 @@ class Index(object):
 
         return entries, total_count
 
+    def find_unique_values(self, property):
+        if property in _STANDARD_TERMS:
+            prefix = _PREFIX_FULL_VALUE + _STANDARD_TERMS[property]['prefix']
+        else:
+            prefix = _PREFIX_FULL_VALUE + _prefix_for_unknown(property)
+
+        return [term.term[len(prefix):]
+                for term in self._database.allterms(prefix)]
+
     def retrieve(self, object_id):
         postings = self._database.postlist(_object_id_term(object_id))
         document = self._database.get_document(postings.next().docid)