Field.db_index If True, a database index will be created for this field.

ManyToManyField.symmetrical Only used in the definition of ManyToManyFields on self. Consider the following model:

class NullBooleanField(**options) [source] Like a BooleanField, but allows NULL

class DurationField(**options) [source] A field for storing periods of time - modeled in

class DecimalField(max_digits=None, decimal_places=None, **options) [source] A fixed-precision

ManyToManyField.db_constraint Controls whether or not constraints should be created in the database for the foreign keys in

db_type(connection) [source] Returns the database column data type for the Field

class BigAutoField(**options) [source] New in

class FileField(upload_to=None, max_length=100, **options) [source] A file-upload field.

Field.error_messages The error_messages argument lets you override the default messages that the field will raise