Removing default value from Rails Migration

Create a new migration and use change_column_default.

http://apidock.com/rails/ActiveRecord/ConnectionAdapters/SchemaStatements/change_column_default

Sets a new default value for a column:

change_column_default(:suppliers, :qualification, 'new')
change_column_default(:accounts, :authorized, 1)

Setting the default to nil effectively drops the default:

change_column_default(:users, :email, nil)