[ANN] Rails 4.2.0.beta2 has been released!

Happy Monday everyone!

Today the Rails team is happy to announce that we have released Rails 4.2.0.beta2.

Thanks to all the early adopters who have participated in the first round of beta testing, we have identified a number of bugs, regressions and other imperfections in the codebase. These problems have since been fixed and included in this release.

Security Issues

This release also includes two security patches.

Web Console 2.0.0.beta4

Along with the Rails 4.2.0.beta2 release we also released Web Console 2.0.0.beta4 which includes a security fix.

If you are already using Web Console in development we recommend you to upgrade to this new version of the gem.

Active Job vulnerability

We also fixed an Active Job bug that allowed String arguments to be deserialized as if they were Global IDs, an object injection security vulnerability.

Breaking Changes

In addition to the security and bug fixes, some of the new APIs have also been refined after further testing in real-world applications. This resulted in the following list of breaking changes that are not backwards-compatible with 4.2.0.beta1:

Active Job

The Active Job API has been overhauled:

# The enqueueing method has changed from +enqueue+ to +perform_later+.
# In 4.2.0.beta1:
# In 4.2.0.beta2:

# The ways jobs are scheduled has changed.
# In 4.2.0.beta1:
MyJob.enqueue_at(Date.tomorrow.noon, record)
MyJob.enqueue_in(1.week, record)
# In 4.2.0.beta2:
MyJob.set(wait_until: Date.tomorrow.noon).perform_later(record)
MyJob.set(wait: 1.week).perform_later(record)
# You can also specify a queue to enqueue the job onto with this new API:
MyJob.set(queue: :low_priority).perform_later(record)

Action Mailer

The Action Mailer API has also undergone some changes:

# Two new methods +#deliver_now+ and +#deliver_now!+ were introduced for
# clarity. +#deliver+ and +#deliver!+ have been deprecated and applications are
# encouraged to use the +#deliver_*+ instead.
# In 4.2.0.beta1:
# In 4.2.0.beta2:

# The options for +#deliver_later+ and +#deliver_later!+ has changed to match
# those on Active Job.
# In 4.2.0.beta1:
Notifier.welcome(User.first).deliver_later!(in: 1.hour)
Notifier.welcome(User.first).deliver_later!(at: 10.hours.from_now)
# In 4.2.0.beta2:
Notifier.welcome(User.first).deliver_later!(wait: 1.hour)
Notifier.welcome(User.first).deliver_later!(wait_until: 10.hours.from_now)

Action Controller render behavior change

Historically, calling render "foo/bar" in a controller action is equivalent to calling render file: "foo/bar". Since beta 2, this has been changed to mean render template: "foo/bar" instead. This is due to a number of potential security issues with the old default behavior. If you need to render a file, please change your code to use the explicit form (render file: "foo/bar") instead.

Full list of changes

As always, you can browse the Rails source code repository on GitHub to view the full list of changes that were included in this release.


The Rails team would like to thank the 66 people who contributed patches to make this release possible!