Store Discussions ID Map on CourseDiscussionSettings model when course publish signal is fired.

common/djangoapps/django_comment_common/migrations/0006_coursediscussionsettings_discussions_id_map.py

@@ -0,0 +1,21 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.12 on 2018-04-23 21:09
+from __future__ import unicode_literals
+
+from django.db import migrations
+import jsonfield.fields
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('django_comment_common', '0005_coursediscussionsettings'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='coursediscussionsettings',
+            name='discussions_id_map',
+            field=jsonfield.fields.JSONField(blank=True, help_text=b'Key/value store mapping discussion IDs to discussion XBlock usage keys.', null=True),
+        ),
+    ]

common/djangoapps/django_comment_common/models.py

@@ -8,6 +8,7 @@ from django.db import models
 from django.db.models.signals import post_save
 from django.dispatch import receiver
 from django.utils.translation import ugettext_noop
+from jsonfield.fields import JSONField
 from opaque_keys.edx.django.models import CourseKeyField
 from six import text_type
 
@@ -180,6 +181,11 @@ class CourseDiscussionSettings(models.Model):
         db_index=True,
         help_text="Which course are these settings associated with?",
     )
+    discussions_id_map = JSONField(
+        null=True,
+        blank=True,
+        help_text="Key/value store mapping discussion IDs to discussion XBlock usage keys.",
+    )
     always_divide_inline_discussions = models.BooleanField(default=False)
     _divided_discussions = models.TextField(db_column='divided_discussions', null=True, blank=True)  # JSON list
 

common/djangoapps/django_comment_common/utils.py

@@ -139,11 +139,18 @@ def set_course_discussion_settings(course_key, **kwargs):
         divided_discussions (list): List of discussion ids.
         division_scheme (str): `CourseDiscussionSettings.NONE`, `CourseDiscussionSettings.COHORT`,
             or `CourseDiscussionSettings.ENROLLMENT_TRACK`
+        discussions_id_map (dict): Dict containing discussion IDs as keys and the associated discussion
+            XBlock usage keys as values.
 
     Returns:
         A CourseDiscussionSettings object.
     """
-    fields = {'division_scheme': basestring, 'always_divide_inline_discussions': bool, 'divided_discussions': list}
+    fields = {
+        'division_scheme': basestring,
+        'always_divide_inline_discussions': bool,
+        'divided_discussions': list,
+        'discussions_id_map': dict,
+    }
     course_discussion_settings = get_course_discussion_settings(course_key)
     for field, field_type in fields.items():
         if field in kwargs: