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Update migrations.md

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default column type modifier
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Kalman Hazins 2014-06-08 10:29:57 -04:00
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@ -303,6 +303,7 @@ braces. You can use the following modifiers:
* `scale` Defines the scale for the `decimal` fields, representing the number of digits after the decimal point.
* `polymorphic` Adds a `type` column for `belongs_to` associations.
* `null` Allows or disallows `NULL` values in the column.
* `default` Allows to set a default value on the column. NOTE: If using a dynamic value (such as date), the default will only be calculated the first time (e.g. on the date the migration is applied.)
For instance, running: