Added username and user_id in opt out email csv.

ECOM-2963

openedx/core/djangoapps/user_api/management/commands/email_opt_in_list.py

@@ -49,6 +49,8 @@ class Command(BaseCommand):
 
     # Fields output in the CSV
     OUTPUT_FIELD_NAMES = [
+        "user_id",
+        "username",
         "email",
         "full_name",
         "course_id",
@@ -199,6 +201,8 @@ class Command(BaseCommand):
         query = (
             u"""
             SELECT
+                user.`id` AS `user_id`,
+                user.`username` AS username,
                 user.`email` AS `email`,
                 profile.`name` AS `full_name`,
                 enrollment.`course_id` AS `course_id`,
@@ -234,8 +238,10 @@ class Command(BaseCommand):
         cursor.execute(query)
         row_count = 0
         for row in self._iterate_results(cursor):
-            email, full_name, course_id, is_opted_in, pref_set_datetime = row
+            user_id, username, email, full_name, course_id, is_opted_in, pref_set_datetime = row
             writer.writerow({
+                "user_id": user_id,
+                "username": username.encode('utf-8'),
                 "email": email.encode('utf-8'),
                 # There should not be a case where users are without full_names. We only need this safe check because
                 # of ECOM-1995.

openedx/core/djangoapps/user_api/management/tests/test_email_opt_in_list.py

@@ -37,6 +37,8 @@ class EmailOptInListTest(ModuleStoreTestCase):
 
     OUTPUT_FILE_NAME = "test_org_email_opt_in.csv"
     OUTPUT_FIELD_NAMES = [
+        "user_id",
+        "username",
         "email",
         "full_name",
         "course_id",
@@ -401,6 +403,8 @@ class EmailOptInListTest(ModuleStoreTestCase):
 
         # Check the header row
         self.assertEqual({
+            "user_id": "user_id",
+            "username": "username",
             "email": "email",
             "full_name": "full_name",
             "course_id": "course_id",
@@ -411,6 +415,8 @@ class EmailOptInListTest(ModuleStoreTestCase):
         # Check data rows
         for user, course_id, opt_in_pref in args:
             self.assertIn({
+                "user_id": str(user.id),
+                "username": user.username.encode('utf-8'),
                 "email": user.email.encode('utf-8'),
                 "full_name": (
                     user.profile.name.encode('utf-8')