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add documentation on how to write migration working with a custom user model

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Benjamin Dauvergne 2013-06-17 17:47:44 +02:00
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Writing migrations
==================
Migration containing reference to the user model must be rewritten manually to
refer to the user model name indirectly. The followind modifications must be applied.
1. First import the `user_model_label` from the `authentic2.compat` module:::
from authentic2.compat import user_model_label
Any reference to `orm['auth.User']` or `orm['authentic2.User']` must be
rewritten into `orm[user_model_label]`. For example this line:::
('user', self.gf('django.db.models.fields.related.ForeignKey')(to=orm['authentic2.User'])),
must be changed to:::
('user', self.gf('django.db.models.fields.related.ForeignKey')(to=orm[user_model_label])),
2. The user model when appearing in the `models` field like this:::
u'auth.user': {
'meta': {'object_name': 'User',
must be rewritten like that:::
user_model_label: {
'Meta': {'object_name': user_model_label.split('.')[-1]},
3. If the user model is referred inside the `to` field of a foreign key
declaration like this:::
'user': ('django.db.models.fields.related.ForeignKey', [], {'to': u"orm['auth.User']"})
must be rewritten like that:::
'user': ('django.db.models.fields.related.ForeignKey', [], {'to': u"orm['%s']" user_model_label})