Merge pull request #22372 from edx/rename_start_in_schedule__1/4

Add start_date field in Schedule model to replace start as it's reserved keyword.

openedx/core/djangoapps/schedules/migrations/0008_add_new_start_date_field.py

@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.26 on 2019-11-21 18:00
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('schedules', '0007_scheduleconfig_hold_back_ratio'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='schedule',
+            name='start_date',
+            field=models.DateTimeField(blank=True, db_index=True, help_text='Date this schedule went into effect', null=True),
+        ),
+    ]

openedx/core/djangoapps/schedules/models.py

@@ -18,10 +18,18 @@ class Schedule(TimeStampedModel):
         default=True,
         help_text=_('Indicates if this schedule is actively used')
     )
+    # TODO Delete this field during last stage of rolling out field renames
     start = models.DateTimeField(
         db_index=True,
         help_text=_('Date this schedule went into effect')
     )
+    start_date = models.DateTimeField(
+        # TODO remove blank=True and null=True once data migration is complete in column rename release.
+        blank=True,
+        db_index=True,
+        null=True,
+        help_text=_('Date this schedule went into effect')
+    )
     upgrade_deadline = models.DateTimeField(
         blank=True,
         db_index=True,