Migration to remove deprecated course_id from db. (#168)

Also remove outdated mgmt command.

Depends on #166.

OC-3033

problem_builder/management/commands/problem_builder_migrate_keys.py

-"""
-Command to copy content of Answer.course_id to Answer.course_key.
-"""
-
-import time
-
-from django.core.management.base import BaseCommand
-from django.db.models import F, Q
-
-from problem_builder.models import Answer
-
-
-class Command(BaseCommand):
-    """
-    Copy content of the deprecated Answer.course_id column into
-    Answer.course_key in batches.  The batch size and sleep time between
-    batches are configurable.
-    """
-    help = 'Copy content of the deprecated Answer.course_id column to Answer.course_key in batches'
-
-    def add_arguments(self, parser):
-        parser.add_argument(
-            '--batch-size',
-            help='The size of each batch of records to copy (default: 5000).',
-            type=int,
-            default=5000,
-        )
-        parser.add_argument(
-            '--offset',
-            help='The lowest primary key to copy (default: 0)',
-            type=int,
-            default=0,
-        )
-        parser.add_argument(
-            '--sleep',
-            help='Number of seconds to sleep before processing the next batch (default: 1).',
-            type=int,
-            default=1,
-        )
-
-    def handle(self, *args, **options):
-        batch_size = options['batch_size']
-        sleep_time = options['sleep']
-        offset = options['offset']
-        max_pk = Answer.objects.order_by('-pk')[0].pk
-        batch_start = offset
-        batch_stop = batch_start + batch_size
-        self.stdout.write(
-            "Copying Answer.course_id field into Answer.course_key in batches of at most {}".format(
-                batch_size
-            )
-        )
-        while batch_start <= max_pk:
-
-            queryset = Answer.objects.filter(
-                pk__gte=batch_start,
-                pk__lt=batch_stop,
-            ).filter(
-                Q(course_key__isnull=True) | Q(course_key='')
-            )
-            queryset.update(course_key=F('course_id'))
-            self.stdout.write(
-                "Processed Answers through pk: {}, max pk: {}".format(batch_stop, max_pk)
-            )
-            if batch_stop < max_pk:
-                time.sleep(sleep_time)
-            batch_start = batch_stop
-            batch_stop += batch_size
-
-        self.stdout.write("Successfully copied Answer.course_id into Answer.course_key")

problem_builder/migrations/0006_remove_deprecated_course_id.py

+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.4 on 2017-09-19 13:57
+from __future__ import unicode_literals
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('problem_builder', '0005_auto_20170112_1021'),
+    ]
+
+    operations = [
+        migrations.AlterUniqueTogether(
+            name='answer',
+            unique_together=set([('student_id', 'course_key', 'name')]),
+        ),
+        migrations.RemoveField(
+            model_name='answer',
+            name='course_id',
+        ),
+    ]

setup.py

@@ -71,7 +71,7 @@ BLOCKS = [
 
 setup(
     name='xblock-problem-builder',
-    version='2.7.6',
+    version='2.7.7',
     description='XBlock - Problem Builder',
     packages=find_packages(),
     install_requires=[