Take advantage of change_column_null to add or remove NOT NULL constraint on a column. The null flag indicates whether the value can be NULL.
To add the constraint (says column cannot be NULL):
change_column_null :users, :name, false
To remove the constraint (allows the column to be NULL):
change_column_null :users, :name, true
The method accepts an optional fourth argument to replace existing +NULL+s with some other value. Use that one when enabling the constraint if needed, since otherwise, those rows would not be valid.
Note: Please note the fourth argument does not set a column’s default.
Top comments (1)
This was really helpful, thank you Viral!