See
https://github.com/rails/rails/commit/cb7d19b66badfbd1846c195913419c331701074e#commitcomment-2127148.

It's sometimes hard to quickly find where deprecated call was performed, especially in case of migrating between Rails versions. So this is an attempt to improve the call stack part of the warning message by providing caller explicitly.

Make doc output in grouped_options_for_select divider example match
actual output. The options groups were in backwards order of actual.

We can avoid creating extra hashes with #merge, and use #merge! instead.

Further simplify the option_html_attributes method after the changes
introduced in dacbcbe5 to not escape the
html options here (since they're going to be escaped down the chain in
content tag).

we don't need to escape values in this method as we pass
these html attributes to `tag_options` method that handle escaping as
well.

it fixes the case when we want to pass html5 data options

When a select tag is created for a field with errors, then the inserted
options will errantly have a <div class="field_with_errors"> wrapping
them.

This reverts commit fa6d921e.

Reason: Not a fan of such massive changes. We usually close such changes
if made to Rails master as a pull request. Following the same principle
here and reverting.

[ci skip]

For future reference, this is the regex I used: ^\s*#\s*\n(?!\s*#). Replace
with the first match, and voilà! Note that the regex matches a little bit too
much, so you probably want to `git add -i .` and go through every single diff
to check if it actually should be changed.

Make the method API more clear by explicitly showing the expected
arguments. This means that the options cannot be passed as second
argument because we are not relying on extract_options! anymore,
you are expected to give a selected key or `nil` if you want to pass
options, as it is the last argument.

Notice that this does not change the current method arguments contract
available in 3.2, it just brings back the same functionality with the
divider addition.

Change prompt to options hash in grouped_options_for_select

Documentation fix in options_for_select helper. Fixed display errors caused by mixing Ruby and HTML code inside the same pre tag [ci skip]

BTW, select works quite faster then find_all:
require 'benchmark'

n = [1]*100_000_000
Benchmark.bm do |x|
  x.report { n.select { |a| a > 1 } }
  x.report { n.find_all { |a| a > 1 } }
end

    user     system      total        real
7.590000   0.010000   7.600000 (  7.927171)
9.650000   0.010000   9.660000 (  9.634406)

collection_radio_buttons

[Carlos Antonio da Silva + Rafael Mendonça França]

[Carlos Antonio da Silva + Rafael Mendonça França]

[Carlos Antonio da Silva + Rafael Mendonça França]

And options_from_collection_for_select as well.

[Carlos Antonio da Silva + Rafael Mendonça França]

[Carlos Antonio da Silva + Rafael Mendonça França]

[Carlos Antonio da Silva + Rafael Mendonça França]

[Carlos Antonio da Silva + Rafael Mendonça França]

module

[Carlos Antonio da Silva + Rafael Mendonça França]

[Carlos Antonio da Silva + Rafael Mendonça França]

[Carlos Antonio da Silva + Rafael Mendonça França]

ActionView::Helpers