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path: root/news/migrations/0009_utc_datetimes.py
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# encoding: utf-8
import datetime
from south.db import db
from south.v2 import DataMigration
from django.db import models
from django.utils.tzinfo import LocalTimezone

def new_date(old_date, reverse=False):
    if old_date is None:
        return None
    tz = LocalTimezone(old_date)
    offset = tz.utcoffset(old_date)
    if reverse:
        offset = -offset
    return old_date - offset

class Migration(DataMigration):

    def forwards(self, orm):
        all_news = orm.News.objects.all().defer('content')
        for news in all_news:
            # prevents full object updates
            orm.News.objects.filter(pk=news.pk).update(
                    postdate=new_date(news.postdate),
                    last_modified=new_date(news.last_modified))

    def backwards(self, orm):
        all_news = orm.News.objects.all().defer('content')
        for news in all_news:
            # prevents full object updates
            orm.News.objects.filter(pk=news.pk).update(
                    postdate=new_date(news.postdate, True),
                    last_modified=new_date(news.last_modified, True))

    models = {
        'auth.group': {
            'Meta': {'object_name': 'Group'},
            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
            'name': ('django.db.models.fields.CharField', [], {'unique': 'True', 'max_length': '80'}),
            'permissions': ('django.db.models.fields.related.ManyToManyField', [], {'to': "orm['auth.Permission']", 'symmetrical': 'False', 'blank': 'True'})
        },
        'auth.permission': {
            'Meta': {'ordering': "('content_type__app_label', 'content_type__model', 'codename')", 'unique_together': "(('content_type', 'codename'),)", 'object_name': 'Permission'},
            'codename': ('django.db.models.fields.CharField', [], {'max_length': '100'}),
            'content_type': ('django.db.models.fields.related.ForeignKey', [], {'to': "orm['contenttypes.ContentType']"}),
            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
            'name': ('django.db.models.fields.CharField', [], {'max_length': '50'})
        },
        'auth.user': {
            'Meta': {'object_name': 'User'},
            'date_joined': ('django.db.models.fields.DateTimeField', [], {'default': 'datetime.datetime.now'}),
            'email': ('django.db.models.fields.EmailField', [], {'max_length': '75', 'blank': 'True'}),
            'first_name': ('django.db.models.fields.CharField', [], {'max_length': '30', 'blank': 'True'}),
            'groups': ('django.db.models.fields.related.ManyToManyField', [], {'to': "orm['auth.Group']", 'symmetrical': 'False', 'blank': 'True'}),
            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
            'is_active': ('django.db.models.fields.BooleanField', [], {'default': 'True'}),
            'is_staff': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
            'is_superuser': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
            'last_login': ('django.db.models.fields.DateTimeField', [], {'default': 'datetime.datetime.now'}),
            'last_name': ('django.db.models.fields.CharField', [], {'max_length': '30', 'blank': 'True'}),
            'password': ('django.db.models.fields.CharField', [], {'max_length': '128'}),
            'user_permissions': ('django.db.models.fields.related.ManyToManyField', [], {'to': "orm['auth.Permission']", 'symmetrical': 'False', 'blank': 'True'}),
            'username': ('django.db.models.fields.CharField', [], {'unique': 'True', 'max_length': '30'})
        },
        'contenttypes.contenttype': {
            'Meta': {'ordering': "('name',)", 'unique_together': "(('app_label', 'model'),)", 'object_name': 'ContentType', 'db_table': "'django_content_type'"},
            'app_label': ('django.db.models.fields.CharField', [], {'max_length': '100'}),
            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
            'model': ('django.db.models.fields.CharField', [], {'max_length': '100'}),
            'name': ('django.db.models.fields.CharField', [], {'max_length': '100'})
        },
        'news.news': {
            'Meta': {'ordering': "['-postdate']", 'object_name': 'News', 'db_table': "'news'"},
            'author': ('django.db.models.fields.related.ForeignKey', [], {'related_name': "'news_author'", 'to': "orm['auth.User']"}),
            'content': ('django.db.models.fields.TextField', [], {}),
            'guid': ('django.db.models.fields.CharField', [], {'max_length': '255'}),
            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
            'last_modified': ('django.db.models.fields.DateTimeField', [], {'db_index': 'True'}),
            'postdate': ('django.db.models.fields.DateTimeField', [], {'db_index': 'True'}),
            'slug': ('django.db.models.fields.SlugField', [], {'unique': 'True', 'max_length': '255', 'db_index': 'True'}),
            'title': ('django.db.models.fields.CharField', [], {'max_length': '255'})
        }
    }

    complete_apps = ['news']