Hi all,
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There are simple model and tag:
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class Tag(models.Model):
name = models.CharField(max_length=50)
class Tour(models.Model):
name = models.CharField(max_length=50)
tags = models.ManyToManyField('Tag',
related_name='tours',)
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I want refactor data base to use django-tagging.
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class Tour(models.Model):
name = models.CharField(max_length=50)
tags = models.ManyToManyField('Tag',
related_name='tours',)
import tagging
tagging.register(Tour)
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First i do datamigration:
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./manage.py datamigration --freeze=tagging tour migrate_to_tagging
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Here i shold implement 'forward' and 'backward' methods.
How to do it? My wrong variant:
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class Migration(DataMigration):
def forwards(self, orm):
for tag in orm.Tag.objects.all():
for tour in tag.tours.all():
orm['tagging.Tag'].objects.add_tag(tour, tag.name)
def backwards(self, orm):
for tag in orm['tagging.Tag'].objects.all():
for tour in tag.tours.all():
tour.tags.add(tag.name)
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This is wrong:
--------
orm['tagging.Tag'].objects.add_tag(tour, tag.name)
AttributeError: 'Manager' object has no attribute 'add_tag'
--------
How to migrate data in right way
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Regards, Andrey
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