Added history to CourseMode

DE-1557

common/djangoapps/course_modes/migrations/0012_historicalcoursemode.py

+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.21 on 2019-06-19 01:31
+from __future__ import unicode_literals
+
+from django.conf import settings
+import django.core.validators
+from django.db import migrations, models
+import django.db.models.deletion
+import re
+import simple_history.models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('course_overviews', '0014_courseoverview_certificate_available_date'),
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+        ('course_modes', '0011_change_regex_for_comma_separated_ints'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='HistoricalCourseMode',
+            fields=[
+                ('id', models.IntegerField(auto_created=True, blank=True, db_index=True, verbose_name='ID')),
+                ('mode_slug', models.CharField(max_length=100, verbose_name='Mode')),
+                ('mode_display_name', models.CharField(max_length=255, verbose_name='Display Name')),
+                ('min_price', models.IntegerField(default=0, verbose_name='Price')),
+                ('currency', models.CharField(default=b'usd', max_length=8)),
+                ('_expiration_datetime', models.DateTimeField(blank=True, db_column=b'expiration_datetime', default=None, help_text='OPTIONAL: After this date/time, users will no longer be able to enroll in this mode. Leave this blank if users can enroll in this mode until enrollment closes for the course.', null=True, verbose_name='Upgrade Deadline')),
+                ('expiration_datetime_is_explicit', models.BooleanField(default=False)),
+                ('expiration_date', models.DateField(blank=True, default=None, null=True)),
+                ('suggested_prices', models.CharField(blank=True, default=b'', max_length=255, validators=[django.core.validators.RegexValidator(re.compile('^\\d+(?:\\,\\d+)*\\Z'), code='invalid', message='Enter only digits separated by commas.')])),
+                ('description', models.TextField(blank=True, null=True)),
+                ('sku', models.CharField(blank=True, help_text='OPTIONAL: This is the SKU (stock keeping unit) of this mode in the external ecommerce service.  Leave this blank if the course has not yet been migrated to the ecommerce service.', max_length=255, null=True, verbose_name=b'SKU')),
+                ('bulk_sku', models.CharField(blank=True, default=None, help_text='This is the bulk SKU (stock keeping unit) of this mode in the external ecommerce service.', max_length=255, null=True, verbose_name=b'Bulk SKU')),
+                ('history_id', models.AutoField(primary_key=True, serialize=False)),
+                ('history_date', models.DateTimeField()),
+                ('history_change_reason', models.CharField(max_length=100, null=True)),
+                ('history_type', models.CharField(choices=[('+', 'Created'), ('~', 'Changed'), ('-', 'Deleted')], max_length=1)),
+                ('course', models.ForeignKey(blank=True, db_constraint=False, null=True, on_delete=django.db.models.deletion.DO_NOTHING, related_name='+', to='course_overviews.CourseOverview')),
+                ('history_user', models.ForeignKey(null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='+', to=settings.AUTH_USER_MODEL)),
+            ],
+            options={
+                'ordering': ('-history_date', '-history_id'),
+                'get_latest_by': 'history_date',
+                'verbose_name': 'historical course mode',
+            },
+            bases=(simple_history.models.HistoricalChanges, models.Model),
+        ),
+    ]

common/djangoapps/course_modes/models.py

@@ -19,6 +19,7 @@ from django.utils.translation import ugettext_lazy as _
 from edx_django_utils.cache import RequestCache
 from opaque_keys.edx.django.models import CourseKeyField
 from opaque_keys.edx.keys import CourseKey
+from simple_history.models import HistoricalRecords
 
 from openedx.core.djangoapps.content.course_overviews.models import CourseOverview
 from openedx.core.lib.cache_utils import request_cached
@@ -140,6 +141,8 @@ class CourseMode(models.Model):
         )
     )
 
+    history = HistoricalRecords()
+
     HONOR = 'honor'
     PROFESSIONAL = 'professional'
     VERIFIED = 'verified'