Flowdock
change_column_default(table_name, column_name, default) public

Sets a new default value for a column.

Examples
change_column_default(:suppliers, :qualification, 'new')
change_column_default(:accounts, :authorized, 1)
change_column_default(:users, :email, nil)
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October 10, 2008
7 thanks

Implemented in database adapters

These methods are not implemented in the abstract classes. Instead, all database adapters implement these separately, if the feature is supported.

July 30, 2009
2 thanks

How to set default value to NULL

To set default value to NULL you can use change_column method instead, for example:

change_column :suppliers, :qualification, :string, :default => nil

Just make sure you don’t change data type accidentally ;-)

October 10, 2008 - (v2.1.0)
1 thank

Not implented yet

According to this method’s source, change_column_default is not implemented as well as change_column