Setting Default Values for Rails Fields

For some fields, you may want to set default values for when a new record is created.  For example, if you want to set a flag/boolean field to true or false when a new record is created.  An easy way to do this is through a migration.

If you are just creating the field, you can do:

def change
add_column :table_name, :field_name, :field_type, :default => 0
add_column :table_name, :field_name, :field_type, :default => true

To edit an existing field:

def up
change_column :table_name, :field_name, :boolean, :default => true

Time Zones in Rails 3

I was looking for what options I could use to set the time zone config in application.rb.  The best I could find were these posts in Stack Overflow:

essentially they are (for the biggest US zones):

Pacific Time (US & Canada), Central Time (US & Canada), Eastern Time (US & Canada)

The posts are good to reference nonetheless, as there seems to be a lot of confusion on what the config does (and time helpers).