All the gory details about all the field options Django’s got to offer.

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If True, Django will store empty values as NULL in the database. Default is False. null  
If True, the field is allowed to be blank. Default is False. blank  
An iterable (e.g., a list or tuple) of 2-tuples to use as choices for this field. choices  
The name of the database column to use for this field. If this isn't given, Django will use the field's name. db_column  
If True, djadmin:django-admin.py sqlindexes <sqlindexes> will output a CREATE INDEX statement for this field. db_index  
The name of the database tablespace to use for this field's index, if this field is indexed. db_tablespace  
The default value for the field. This can be a value or a callable object. If callable it will be called every time a new object is created. default  
If False, the field will not be editable in the admin or via forms automatically generated from the model class. Default is True. editable  
Lets you override the default messages that the field will raise. Pass in a dictionary with keys matching the error messages you want to override. error_messages  
Extra "help" text to be displayed under the field on the object's admin form. help_text  
If True, this field is the primary key for the model. primary_key  
If True, this field must be unique throughout the table. unique  
Set this to the name of a DateField or DateTimeField to require that this field be unique for the value of the date field. unique_for_date  
Like unique_for_date, but requires the field to be unique with respect to the month. unique_for_month  
Like unique_for_date and unique_for_month. unique_for_year  
A human-readable name for the field. If the verbose name isn't given, Django will automatically create it using the field's attribute name, converting underscores to spaces. verbose_name  
A list of validators to run for this field. validators  

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