Merge pull request RasaHQ#4813 from RasaHQ/events-metadata

Allow metadata to be attached to any tracker Event

Author: federicotdn

.gitignore

@@ -84,3 +84,4 @@ events.db
 *.coverage*
 env
 venv
+.dir-locals.el

CHANGELOG.rst

@@ -18,6 +18,9 @@ Added
 - Added documentation for ``AugmentedMemoizationPolicy``
 - Fall back to ``InMemoryTrackerStore`` in case there is any problem with the current
   tracker store
+- Arbitrary metadata can now be attached to any ``Event`` subclass. The data must be
+  stored under the ``metadata`` key when reading the event from a JSON object or
+  dictionary.
 - Add command line argument ``rasa x --config CONFIG``, to specify path to the policy and
   NLU pipeline configuration of your bot (default: ``config.yml``)
 - Added a new NLU featurizer - ``ConveRTFeaturizer`` based on `ConveRT <https://github.com/PolyAI-LDN/polyai-models>`_ model released by PolyAI.

data/test_trackers/tracker_moodbot.json

@@ -39,6 +39,7 @@
     },
     {
       "timestamp": 1517821726.200036,
+      "metadata": {},
       "parse_data": {
         "entities": [],
         "intent": {
@@ -63,7 +64,7 @@
       },
       "event": "user",
       "text": "/greet",
-      "input_channel": null, "message_id": null, "metadata": null
+      "input_channel": null, "message_id": null, "metadata": {}
     },
     {
       "timestamp": 1517821726.200373,
@@ -81,6 +82,7 @@
     },
     {
       "timestamp": 1517821726.209836,
+      "metadata": {},
       "parse_data": {
         "entities": [],
         "intent": {
@@ -105,7 +107,7 @@
       },
       "event": "user",
       "text": "/mood_great",
-      "input_channel": null, "message_id": null, "metadata": null
+      "input_channel": null, "message_id": null, "metadata": {}
     },
     {
       "timestamp": 1517821726.209908,