Rails Migration to make a column null => true
I had originally created a table with column as
t.string "email", :default => "", :null => false
The requirement has changed and now I need to allow email to be null. How can I write a migration to make :null => true
change_column :table_name, :email, :string, :null => true
I could not get the above solution to work with Active Record 4.0.8 and Postgresql 9.3
However change_column_null worked perfectly.
change_column_null :users, :email, true
The reverse has a nice option to update existing records (but not set the default) when null is not allowed.