| null | If true, empty values may be stored as null in the database |
| blank | If true, then the field will not be required in forms. If fields are left blank, Django will use the default field value. |
| choices | An iterable of 2-element iterables to be used as choices for this field. If set, field is rendered as a drop-down in the admin. [('m', 'Male'),('f','Female'),('z','Prefer Not to Disclose')]. To group options, simply nest the values: [('Video Source',((1,'YouTube'),(2,'Facebook')),('Audio Source',((3, 'Soundcloud'),(4, 'Spotify'))] |
| db_column | By default, django uses the field name for the database column. Use this to provide a custom name |
| db_index | If True, an index will be created on this field in the database |
| db_tablespace | The tablespace to use for this field's index. This field is only used if the database engine supports it, otherwise its ignored. |
| default | The default value for this field. Can be a value, or a callable object. For mutable defaults (a list, a set, a dictionary) you must use a callable. Due to compatibility with migrations, you cannot use lambdas. |
| editable | If False, the field is not shown in the model admin or any ModelForm. Default is True. |
| error_messages | Used to customize the default error messages shown for this field. The value is a dictionary, with the keys representing the error and the value being the message. Default keys (for error messages) are null, blank, invalid, invalid_choice, unique and unique_for_date; additional error messages may be defined by custom fields. |
| help_text | Text to be displayed with the field, to assist users. HTML is allowed. |
| on_delete | When an object referenced by a ForeignKey is deleted, Django will emulate the behavior of the SQL constraint specified by the on_delete argument. This is the second positional argument for both ForeignKey and OneToOneField fields. Other fields do not have this argument. |
| primary_key | If True, this field will be the primary key. Django automatically adds a primary key; so this is only required if you wish to create a custom primary key. You can only have one primary key per model. |
| unique | If True, errors are raised if duplicate values are entered for this field. This is a database-level restriction, and not simply a user-interface block. |
| unique_for_date | Set the value to a DateField or DateTimeField, and errors will be raised if there are duplicate values for the same date or date time. |
| unique_for_month | Similar to unique_for_date, except checks are limited for the month. |
| unique_for_year | Similar to unique_for_date, except checks are limited to the year. |
| verbose_name | A friendly name for the field, used by django in various places (such as creating labels in the admin and model forms). |
| validators | A list of validators for this field. |
