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Remove foreign key constraint on CourseOverviewTab -> CourseOverview

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This will allow v1 code of CourseOverview to delete entries. While
this is not a good thing in general (and future versions will ignore
entries with higher versions than they support), this is necessary
to prevent errors with the existing code in a rollback situation.
Otherwise, old code trying to delete CourseOverview entries will
fail with a foreign key constraint violation.
This commit is contained in:
David Ormsbee
2015-10-20 14:17:51 -04:00
parent 3cd348008d
commit 4ac9725793
1 changed files with 63 additions and 0 deletions
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63
openedx/core/djangoapps/content/course_overviews/migrations/0008_drop_course_tabs_fk_constraint.py Normal file
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# -*- coding: utf-8 -*-
from south.utils import datetime_utils as datetime
from south.db import db
from south.v2 import SchemaMigration
from django.db import models
class Migration(SchemaMigration):
def forwards(self, orm):
# Foreign keys aren't enforced by default on our version of SQLite3, and
# trying to delete them will throw an error. See:
# http://south.aeracode.org/ticket/775
if db.backend_name != 'sqlite3':
db.delete_foreign_key('course_overviews_courseoverviewtab', 'course_overview_id')
def backwards(self, orm):
pass
models = {
'course_overviews.courseoverview': {
'Meta': {'object_name': 'CourseOverview'},
'_location': ('xmodule_django.models.UsageKeyField', [], {'max_length': '255'}),
'_pre_requisite_courses_json': ('django.db.models.fields.TextField', [], {}),
'advertised_start': ('django.db.models.fields.TextField', [], {'null': 'True'}),
'cert_html_view_enabled': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
'cert_name_long': ('django.db.models.fields.TextField', [], {}),
'cert_name_short': ('django.db.models.fields.TextField', [], {}),
'certificates_display_behavior': ('django.db.models.fields.TextField', [], {'null': 'True'}),
'certificates_show_before_end': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
'course_image_url': ('django.db.models.fields.TextField', [], {}),
'created': ('model_utils.fields.AutoCreatedField', [], {'default': 'datetime.datetime.now'}),
'days_early_for_beta': ('django.db.models.fields.FloatField', [], {'null': 'True'}),
'display_name': ('django.db.models.fields.TextField', [], {'null': 'True'}),
'display_number_with_default': ('django.db.models.fields.TextField', [], {}),
'display_org_with_default': ('django.db.models.fields.TextField', [], {}),
'end': ('django.db.models.fields.DateTimeField', [], {'null': 'True'}),
'end_of_course_survey_url': ('django.db.models.fields.TextField', [], {'null': 'True'}),
'enrollment_domain': ('django.db.models.fields.TextField', [], {'null': 'True'}),
'enrollment_end': ('django.db.models.fields.DateTimeField', [], {'null': 'True'}),
'enrollment_start': ('django.db.models.fields.DateTimeField', [], {'null': 'True'}),
'facebook_url': ('django.db.models.fields.TextField', [], {'null': 'True'}),
'has_any_active_web_certificate': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
'id': ('xmodule_django.models.CourseKeyField', [], {'max_length': '255', 'primary_key': 'True', 'db_index': 'True'}),
'invitation_only': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
'lowest_passing_grade': ('django.db.models.fields.DecimalField', [], {'null': 'True', 'max_digits': '5', 'decimal_places': '2'}),
'max_student_enrollments_allowed': ('django.db.models.fields.IntegerField', [], {'null': 'True'}),
'mobile_available': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
'modified': ('model_utils.fields.AutoLastModifiedField', [], {'default': 'datetime.datetime.now'}),
'social_sharing_url': ('django.db.models.fields.TextField', [], {'null': 'True'}),
'start': ('django.db.models.fields.DateTimeField', [], {'null': 'True'}),
'version': ('django.db.models.fields.IntegerField', [], {}),
'visible_to_staff_only': ('django.db.models.fields.BooleanField', [], {'default': 'False'})
},
'course_overviews.courseoverviewtab': {
'Meta': {'object_name': 'CourseOverviewTab'},
'course_overview': ('django.db.models.fields.related.ForeignKey', [], {'related_name': "'tabs'", 'to': "orm['course_overviews.CourseOverview']"}),
'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
'tab_id': ('django.db.models.fields.CharField', [], {'max_length': '50'})
}
}
complete_apps = ['course_overviews']