Given it’s a raw expression, you should use
DB::raw() to set
CURRENT_TIMESTAMP as a default value for a column:
This works flawlessly on every database driver.
As of Laravel 5.1.25 (see PR 10962 and commit 15c487fe) you can now use the new
useCurrent() column modifier method to achieve the same default value for a column:
Back to the question, on MySQL you could also use the
ON UPDATE clause through
$table->timestamp('updated_at')->default(DB::raw('CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP'));
Again, as of Laravel 8.36.0 (see PR 36817) you can now use the new
useCurrentOnUpdate() column modifier method together with the
useCurrent() modifier to achieve the same default value for a column:
Starting with MySQL 5.7,
0000-00-00 00:00:00is no longer considered a valid date. As documented at the Laravel 5.2 upgrade guide, all timestamp columns should receive a valid default value when you insert records into your database. You may use the
useCurrent()column modifier (from Laravel 5.1.25 and above) in your migrations to default the timestamp columns to the current timestamps, or you may make the timestamps
nullable()to allow null values.
PostgreSQL & Laravel 4.x
In Laravel 4.x versions, the PostgreSQL driver was using the default database precision to store timestamp values. When using the
CURRENT_TIMESTAMPfunction on a column with a default precision, PostgreSQL generates a timestamp with the higher precision available, thus generating a timestamp with a fractional second part – see this SQL fiddle.
This will led Carbon to fail parsing a timestamp since it won’t be expecting microseconds being stored. To avoid this unexpected behavior breaking your application you have to explicitly give a zero precision to the
CURRENT_TIMESTAMPfunction as below:
Since Laravel 5.0,
timestamp()columns has been changed to use a default precision of zero which avoids this.
Thanks to @andrewhl for pointing out the Laravel 4.x issue in the comments.
Thanks to @ChanakaKarunarathne for bringing out the new
useCurrentOnUpdate() shortcut in the comments.