What’s New in Rails 3.1.0?

By Tian On August 31, 2011 · Leave a Comment

At Gojee, we are running Rails 3.0.7. Recently, we’ve been experimenting with the Sprockets, Coffeescript, and Sass.

With tonight’s release of 3.1.0. All of our experimentation will soon become fully compatible with mainstream Rails, since 3.1.0 comes with default support for JQuery, Sprockets, Coffeescript and Sass.

I also found the following updates to 3.1.0 awesome and important. For the full list go here

Reading up on some of the rails 3.1 features:

HTTP Streaming, allowing a user’s browser to download Stylesheets and JS while the server is generating the response.

Default scopes are now evaluated at the latest possible moment, to avoid problems where scopes would be created which would implicitly contain the default scope, which would then be impossible to get rid of via Model.unscoped.

Support the :dependent option on has_many :through associations. For historical and practical reasons, :delete_all is the default deletion strategy employed byassociation.delete(*records), despite the fact that the default strategy is :nullifyfor regular has_many. Also, this only works at all if the source reflection is a belongs_to. For other situations, you should directly modify the through association.

Migrations are now reversible, meaning that Rails will figure out how to reverse your migrations. To use reversible migrations, just define the change method.

class MyMigration < ActiveRecord::Migration

def change

create_table(:horses) do

t.column :content, :text

t.column :remind_at, :datetime

end

Migrations now use instance methods rather than class methods
class FooMigration < ActiveRecord::Migration

  def up # Not self.up

    ...

  end

end