Is it possible to write a Django model with a field that uses a

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Asked: May 31, 20262026-05-31T06:26:32+00:00 2026-05-31T06:26:32+00:00

Is it possible to write a Django model with a field that uses a

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Is it possible to write a Django model with a field that uses a PostgreSQL function as its default value? Here’s a simple example using txid_current() as a default value:

% psql
mydb=# CREATE TABLE test (
    label text default '', 
    txid BIGINT DEFAULT txid_current()
);
CREATE TABLE
mydb=# \d test
           Table "public.test"
 Column |  Type  |       Modifiers        
--------+--------+------------------------
 label  | text   | default ''::text
 txid   | bigint | default txid_current()

mydb=# INSERT INTO test (label) VALUES ('mylabel');
INSERT 0 1
mydb=# select * from test;
  label  |  txid  
---------+--------
 mylabel | 192050
(1 row)

A Django model for that table might look like

class Test(models.Model):
    label = TextField('Label', default='')
    txid = BigIntegerField('txid', default=???)

Is there a way to specify the database function as a default value or do I need to add the default in PostgreSQL as a separate step after running syncdb?