Upgrading

This document details breaking changes between versions, with any necessary steps to safely upgrade.

For an overview of what has changed between versions, see the Changelog.

Instructions

Tagulous follows semantic versioning in the format BREAKING.FEATURE.BUG:

Read the upgrade notes for a BREAKING release to see if you need to take further action when upgrading.
FEATURE and BUG releases will be safe to install without reading the upgrade notes.

Check which version of Tagulous you are upgrading from:

python
>>> import tagulous
>>> tagulous.__version__

Upgrade the Tagulous package:
```
pip install --upgrade django-tagulous
```
Scroll down to the earliest instructions relevant to your version, and follow them up to the latest version.

Upgrading from 1.3.3

Tagulous 1.3.3 was the last version to support Django 2.2. Tagulous 2.0.0 requires Django 3.2 or later, and is only tested against Python 3.10 or later.

Upgrading from 1.1.0

Slugify behaviour

In Tagulous 1.2.0 the slugify logic has been replaced with Django’s now all supported Django versions support the allow_unicode slugify option.

If unicode tag slugs are not enabled with TAGULOUS_SLUG_ALLOW_UNICODE setting, Django’s implementation of unicode to ASCII does not support logographic characters, so these will be stripped as per Django’s standard slugify() output, rather than Tagulous’ old behaviour of replacing them with underscore characters. This can now lead to empty slugs, which will now default to a single underscore.

As a result of this change, the optional dependency unidecode and its corresponding extra installation requirements [i18n] have been removed.

Upgrading from 0.14.1

Django and Python support

Tagulous 0.14.1 was the last version to support Django 1.10 and earlier. Tagulous 1.0.0 requires Django 1.11 or later, and Python 2.7 or 3.5 or later.

Autocomplete upgrade

Tagulous 1.0.0 changes the default JavaScript adaptor to use select2 v4. This may necessitate some styling changes on your user-facing pages if you have overridden the default styles.

Single tag behaviour

Tagulous 1.0.0 no longer allows whitespace tags in SingleTagField.

Upgrading from 0.14.0

Tagulous 0.14.0 was the last version to officially support Django 1.10 or earlier.

Upgrading from 0.13.0

Setting null in a model TagField has raised a warning in the parent ManyToManyField since Django 1.9. The warning now correctly blames a TagField instead. The null argument in a model TagField is deprecated and has no effect, so should not be used.
Version 0.13.1 reduces support for Python 3.3. No known breaking changes have been introduced, but this version of Python will no longer be tested against due to lack of support in third party tools.

Upgrading from 0.12.0

Auto-generated tag models have been renamed.

Django 1.11 introduced a rule that models cannot start with an underscore. Prior to this, Tagulous auto-generated tag models started _Tagulous_, to indicate they are auto-generated. From now on, they will start Tagulous_.

Django migrations should detect this model name change:
```
./manage.py makemigrations
Did you rename the myapp._Tagulous_MyModel model to Tagulous_MyModel? [y/N]
```
Answer y for all Tagulous auto-generated models, and migrate:
```
./manage.py migrate
```
Troubleshooting:
- If you do not see the rename prompt when running makemigrations, you will need to edit the migration manually - see RenameModel <https://docs.djangoproject.com/en/1.11/ref/migration-operations/#renamemodel> in the Django documentation for more details.
- If any AlterField changes to the SingleTagField or TagField definitions are included in this set of migrations, the new tag model’s name will not be correctly detected and you will see the errors Related model ... cannot be resolved or AttributeError: 'TagField' object has no attribute 'm2m_reverse_field_name'. To resolve these, manually change the to parameter in your AlterField’s tag field definition from myapp._Tagulous_... to myapp.Tagulous_....
- If you see an error Renaming the table while in a transaction is not supported because it would break referential integrity, add atomic = False to your migration class.
Version 0.13.0 reduces support for Django 1.4 and Python 3.2. No known breaking changes have been introduced, but these versions of Django and Python will no longer be tested against due to lack of support in third party tools.
The TagField manager’s __len__ has now been removed, following its deprecation in 0.12.0. If you are currently using len(instance.tagfield) then you should switch to using instance.tagfield.count() instead (see upgrade instructions).

Upgrading from 0.11.1

Starting with version 0.12.0, Tagulous no longer enforces uniqueness for tree path fields. This means that Django will detect a change to your models, and warn you that your migrations are out of sync. It is safe for you to create and apply a standard migration with:
```
./manage.py makemigrations
./manage.py migrate
```
This change is to avoid MySQL (and possibly other databases) from the errror "BLOB/TEXT column 'path' used in key specification without a key length" - see https://github.com/radiac/django-tagulous/issues/1 for discussion.
Version 0.12.0 deprecates the model tag manager’s __len__ method in preparation for merging https://github.com/radiac/django-tagulous/pull/10 to resolve https://github.com/radiac/django-tagulous/issues/9.

If you are currently using len(instance.tagfield) then you should switch to using instance.tagfield.count() instead.

Upgrading from 0.9.0

Starting with version 0.10.0, Tagulous is available on pypi. You can continue to run the development version direct from github, but if you would prefer to use stable releases you can reinstall:
```
pip uninstall django-tagulous
pip install django-tagulous
```

Version 0.10.0 adds label and level fields to the TagTreeModel base class (they were previously properties). This means that each of your tag tree models will need a schema and data migration.

The schema migration will require a default value for the label; enter any valid string, eg '.'

The data migration will need to call mytagtreemodel.objects.rebuild() to set the correct values for label and level.

You will need to create and apply these migrations to each of your tag tree models

Django migrations:

python manage.py makemigrations myapp
python manage.py migrate myapp
python manage.py makemigrations myapp --empty
# Add data migration operation below
python manage.py migrate myapp

Your Django data migration should include:

def rebuild_tree(apps, schema_editor):
    # For an auto-generated tag tree model:
    model = apps.get_model('myapp', '_Tagulous_MyModel_tagtreefield')

    # For a custom tag tree model:
    #model = apps.get_model('myapp', 'MyTagTreeModel')

    model.objects.rebuild()

class Migration(migrations.Migration):
    # ... rest of Migration as generated
    operations = [
        migrations.RunPython(rebuild_tree)
    ]

South migrations:

python manage.py schemamigration --auto myapp
python manage.py migrate myapp
python manage.py datamigration myapp upgrade_trees
# Add data migration function below
python manage.py migrate myapp

Your South data migration function should be:

def forwards(self, orm):
    # For an auto-generated tag tree model:
    model = orm['myapp._Tagulous_MyModel_tagtreefield'].objects.rebuild()

    # For a custom tag tree model:
    #model = orm['myapp.MyTagTreeModel'].objects.rebuild()

Since version 0.10.0 tree cannot be set in TagMeta; custom tag models must get their tree status from their base class.
In version 0.10.0, TagOptions.field_items was renamed to TagOptions.form_items, and constants.FIELD_OPTIONS was renamed to constants.FORM_OPTIONS. These were internal, so should not affect your code.
The tag parsers now accept a new argument to control whether space is used as a delimiter or not. These are internal, so should not affect your code, unless you have written a custom adaptor.

Upgrading from 0.8.0

Since 0.9.0, SingleTagField and TagField raise an exception if the tag model isn’t a subclass of TagModel.
The documentation for tagulous.models.migrations.add_unique_column has been clarified to illustrate the risk of using it with a non-transactional database. If you use this in your migrations, read the documentation to be sure you understand the problem involved.

Upgrading from 0.7.0 or earlier

tagulous.admin.tag_model was deprecated in 0.8.0 and removed in 0.9.0; use tagulous.admin.register instead:

tagulous.admin.tag_model(MyModel.tags)
tagulous.admin.tag_model(MyModel.tags, my_admin_site)
# becomes:
tagulous.admin.register(MyModel.tags)
tagulous.admin.register(MyModel.tags, site=my_admin_site)

Since 0.8.0, a ValueError exception is raised if a tag model field definition specifies both a tag model and tag options.

For custom tag models, tag options must be set by adding a class TagMeta to your model. You can no longer set tag options in the tag field.

Where an auto-generated tag model is shared with another tag field, the first tag field must set all tag options.

Any existing South migrations with SingleTagField or TagField definitions which automatically generate their tag models will need to be manually modified in the Migration.models definition to have the attribute '_set_tag_meta': 'True'. For example, the line:

'labels': ('tagulous.models.fields.TagField', [], {'force_lowercase': 'True', 'to': u"orm['myapp._Tagulous_MyModel_labels']", 'blank': 'True'}),

becomes:

'labels': ('tagulous.models.fields.TagField', [], {'force_lowercase': 'True', 'to': u"orm['myapp._Tagulous_MyModel_labels']", 'blank': 'True', '_set_tag_meta': 'True'}),

Any db.add_column calls will need to be changed too:

db.add_column(u'myapp_mymodel', 'singletag',
              self.gf('tagulous.models.fields.SingleTagField')(null=True, ...),
              ...)

becomes:

db.add_column(u'myapp_mymodel', 'singletag',
              self.gf('tagulous.models.fields.SingleTagField')(_set_tag_meta=True, null=True, ...),
              ...)

This will use the keyword tag options to update the tag model’s objects, rather than raising the new ValueError.