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avoid errors when forward-migrating course_groups after south conversion

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JIRA: TNL-937
This commit is contained in:
jsa
2014-12-05 12:31:24 -05:00
parent eced849db0
commit de6ca4a7a7
1 changed files with 34 additions and 17 deletions
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51
openedx/core/djangoapps/course_groups/migrations/0001_initial.py
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@@ -2,31 +2,48 @@
import datetime
from south.db import db
from south.v2 import SchemaMigration
from django.db import models
from django.db import models, connection
class Migration(SchemaMigration):
def forwards(self, orm):
# Adding model 'CourseUserGroup'
db.create_table('course_groups_courseusergroup', (
('id', self.gf('django.db.models.fields.AutoField')(primary_key=True)),
('name', self.gf('django.db.models.fields.CharField')(max_length=255)),
('course_id', self.gf('xmodule_django.models.CourseKeyField')(max_length=255, db_index=True)),
('group_type', self.gf('django.db.models.fields.CharField')(max_length=20)),
))
db.send_create_signal('course_groups', ['CourseUserGroup'])
# Adding unique constraint on 'CourseUserGroup', fields ['name', 'course_id']
db.create_unique('course_groups_courseusergroup', ['name', 'course_id'])
def table_exists(name):
return name in connection.introspection.table_names()
# Adding M2M table for field users on 'CourseUserGroup'
db.create_table('course_groups_courseusergroup_users', (
('id', models.AutoField(verbose_name='ID', primary_key=True, auto_created=True)),
('courseusergroup', models.ForeignKey(orm['course_groups.courseusergroup'], null=False)),
('user', models.ForeignKey(orm['auth.user'], null=False))
))
db.create_unique('course_groups_courseusergroup_users', ['courseusergroup_id', 'user_id'])
def index_exists(table_name, column_name):
return column_name in connection.introspection.get_indexes(connection.cursor(), table_name)
# Since this djangoapp has been converted to south migrations after-the-fact,
# these tables/indexes should already exist when migrating an existing installation.
if not (
table_exists('course_groups_courseusergroup') and
index_exists('course_groups_courseusergroup', 'name') and
index_exists('course_groups_courseusergroup', 'course_id') and
table_exists('course_groups_courseusergroup_users') and
index_exists('course_groups_courseusergroup_users', 'courseusergroup_id') and
index_exists('course_groups_courseusergroup_users', 'user_id')
):
db.create_table('course_groups_courseusergroup', (
('id', self.gf('django.db.models.fields.AutoField')(primary_key=True)),
('name', self.gf('django.db.models.fields.CharField')(max_length=255)),
('course_id', self.gf('xmodule_django.models.CourseKeyField')(max_length=255, db_index=True)),
('group_type', self.gf('django.db.models.fields.CharField')(max_length=20)),
))
db.send_create_signal('course_groups', ['CourseUserGroup'])
# Adding unique constraint on 'CourseUserGroup', fields ['name', 'course_id']
db.create_unique('course_groups_courseusergroup', ['name', 'course_id'])
# Adding M2M table for field users on 'CourseUserGroup'
db.create_table('course_groups_courseusergroup_users', (
('id', models.AutoField(verbose_name='ID', primary_key=True, auto_created=True)),
('courseusergroup', models.ForeignKey(orm['course_groups.courseusergroup'], null=False)),
('user', models.ForeignKey(orm['auth.user'], null=False))
))
db.create_unique('course_groups_courseusergroup_users', ['courseusergroup_id', 'user_id'])
def backwards(self, orm):
# Removing unique constraint on 'CourseUserGroup', fields ['name', 'course_id']