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# Field Extensions

synopsis: | Current Field Extensions

## Current Database Model Field Extensions

- AutoSlugField - AutoSlugfield will automatically create a unique slug incrementing an appended number on the slug until it is unique. Inspired by SmileyChris’ Unique Slugify snippet.

- CreationDateTimeField - DateTimeField that will automatically set its date when the object is first saved to the database. Works in the same way as the auto_now_add keyword.

- ModificationDateTimeField - DateTimeField that will automatically set its date when an object is saved to the database. Works in the same way as the auto_now keyword.

- UUIDField - UUIDField for Django, supports all uuid versions that are natively supported by the uuid python module.

  Deprecated since version 1.4.7: Django 1.8 features a native UUIDField. Django-Extensions will support UUIDField until Django 1.7 becomes unsupported.

- PostgreSQLUUIDField - UUIDField for Django, uses PostgreSQL uuid type.

  Deprecated since version 1.4.7: Django 1.8 features a native UUIDField. Django-Extensions will support UUIDField until Django 1.7 becomes unsupported.

- EncryptedCharField - CharField which transparently encrypts its value as it goes in and out of the database. Encryption is handled by Keyczar. To use this field you must have Keyczar installed, have generated a primary encryption key, and have `settings.ENCRYPTED_FIELD_KEYS_DIR` set to the full path of your keys directory.

- EncryptedTextField - CharField which transparently encrypts its value as it goes in and out of the database. Encryption is handled by Keyczar. To use this field you must have Keyczar installed, have generated a primary encryption key, and have `settings.ENCRYPTED_FIELD_KEYS_DIR` set to the full path of your keys directory.

- ShortUUIDField - CharField which transparently generates a UUID and pass it to base57. It result in shorter 22 characters values useful e.g. for concise, unambiguous URLS. It’s possible to get shorter values with length parameter: they are not Universal Unique any more but probability of collision is still low

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