we should take disabled option not only from `html_options` hash but from
`options` hash too like `build_select` method does it. So

datetime_select("post", "updated_at", { :discard_minute => true }, { :disabled => true })
datetime_select("post", "updated_at", :discard_minute => true , :disabled => true)

both these variants work now

closes #7431

We simplify two things here: First since * is greedy it is enough to go
look for the rightmost ::, no need to ask the regexp engine to match the
rest of the string since we are not validating anything, only capturing.
The second simplification comes from using a look-ahead assertion, that
allows us to have the capture in $&, thus removing the need of a group.

Accept a symbol for `:in` option on inclusion and exclusion validators

Extract ActiveRecord::SessionStore from Rails

Tell people to install `activerecord-session_store` gem when it's not
installed instead ofraising `NameError` on missing
`ActionDispatch::Session::ActiveRecordStore`.

This functionality will be available from gem
`active_record-session_store` instead.

Fix tests that depend on run order

The new regexp has less work to do, we anchor a fixed string at the end
and need no group.

Model.select takes a variable list of arguments

This is a cleaner version of #6916.

Closes #3165.

Update the documentation for the :autosave option on belongs_to

I've noticed a caveat with the :autosave option biting people before.
Questions arise about why they must explicitly save an associated object
in their own before_save callbacks. I've updated the documentation as
such to note to users that the :autosave callback occurs before any
user defined callbacks. They must save the associated record themselves
if altering it in their own callbacks.
Signed-off-by: NDavid Celis <david@davidcelis.com>

This reverts commit b0ab8dc0
because it was removing the contents of the message when we
did not have any tag. A test case is also committed.

The reason the test was failing was because when the test
invokes `app.config`, the app is loaded and, as `eager_load`
is set to true, it disables the dependency loading mechanism,
so controllers that are later defined are not loaded.

The revised test assumed that the default permissions of a file
matched the umask of the process, but in the general case that
depends also on the file system. This test was failing in the
/vagrant shared folder of Rails development boxes.

Extended documentation for `time_ago_in_words` helper

Remind user a good way to generate a secret code [ci skip]

AR::Relation#model would be a better API than AR::Relation#klass

Remove j alias for ERB::Util.json_escape