enable FT.TAGVALS command (#94)

* add the ability to return the results of FT.TAGVALS command

* match names in docstring

* review suggestions

Author: maguec

redisearch/client.py

@@ -174,6 +174,7 @@ class Client(object):
     GET_CMD = 'FT.GET'
     MGET_CMD = 'FT.MGET'
     CONFIG_CMD = 'FT.CONFIG'
+    TAGVALS_CMD = 'FT.TAGVALS'
 
     NOOFFSETS = 'NOOFFSETS'
     NOFIELDS = 'NOFIELDS'
@@ -648,3 +649,16 @@ def config_get(self, option):
             for kvs in raw:
                 res[kvs[0]] = kvs[1]
         return res
+
+    def tagvals(self, tagfield):
+        """
+        Return a list of all possible tag values
+
+        ### Parameters
+
+        - **tagfield**: Tag field name
+        """
+
+        cmd = self.redis.execute_command(self.TAGVALS_CMD, self.index_name, tagfield)
+        return cmd
+

test/test.py

@@ -596,8 +596,12 @@ def testTags(self):
             client.redis.flushdb()
 
             client.create_index((TextField('txt'), TagField('tags')))
+            
+            tags  = 'foo,foo bar,hello;world'
+            tags2 = 'soba,ramen'
 
-            client.add_document('doc1', txt = 'fooz barz', tags = 'foo,foo bar,hello;world')
+            client.add_document('doc1', txt = 'fooz barz', tags = tags)
+            client.add_document('doc2', txt = 'noodles', tags = tags2)
 
             for i in r.retry_with_rdb_reload():
                 waitForIndex(r, 'idx')
@@ -617,6 +621,9 @@ def testTags(self):
                 res = client.search(q)
                 self.assertEqual(1, res.total)
 
+                q2 = client.tagvals('tags')
+                self.assertEqual(tags.split(',') + tags2.split(','), q2)
+
     def testTextFieldSortableNostem(self):
         conn = self.redis()