Django in Action

appendix D Django ORM field reference

This appendix is a reference guide for Django’s built-in Database ORM fields. For a full reference, see the online documentation: https://docs.djangoproject.com/en/dev/ref/models/fields/.

D.1 Field options

Table D.1 contains the constructor arguments that can be used in all ORM field types.

Table D.1 Arguments common to all fields

Argument	Description
null	When True, empty values are stored in the database as NULL.
blank	When True, the value is allowed to be blank. Note: this is different from null, which is related to database storage. This field is used during field validation—for example, in the Django Admin.
choices=[("en", "English"), ("fr", "French")]	If present, this ...