Its ideal to set Vary: Accept-Encoding, irrespective of whether gzipped or not

[ci skip] update guide for Puma web server instead of Webrick

Rails 5.0 default server puma web server. following commit - https://github.com/rails/rails/commit/ae48ea69

- Changed from bin/rake to bin/rails at more application places. [ci skip]

- Only ones left are from the upgrading guide, and command line guide explicit section about rake

Follow up of https://github.com/rails/rails/pull/23119
[ci skip]

[close #23084] Deprecated StrongParameters

use bin/rails default instead of rake commands [ci skip]

Its ideal to set Vary: Accept-Encoding, irrespective of whether gzipped version exists or not. This is helpful for CDN's to later distinguish assets, based on previous, current copies and introduced gzip version if any.

For ref: https://www.fastly.com/blog/best-practices-for-using-the-vary-header

This change sets `Vary` header always, to be on safer side

I go through the `http://edgeguides.rubyonrails.org/` and found `rake` commands in various files that are in RAILS 5.0 implement by `bin/rails` command. I try to change all that can be directly use `bin/rails …`

It's reasonable to expose different value readers.

We can provide a more flexible upgrade experience by warning users they are using unsafe methods instead of forcing the safe API by deprecating before removal. This PR provides this functionality.

Guides header changes

- Add new logo for guides header
[ci skip]

Fix test failure on PostgreSQL by sorting the result before comparison

Closes #21986.

This makes it possible to write custom types that define a different
mapping for STI columns.

Mention that halting chain does not re-raise  `ActiveRecord::RecordIn…

Make text about render :html option clearer to state, text will get e…

Mention that halting chain does not re-raise  `ActiveRecord::RecordInvalid` exception as well, similar to `ActiveRecord::Rollback`

Fixes #22297

[ci skip]

Make text about render :html option clearer to state, text will get escaped if not marked as safe by using html_safe

Fixes #22648
[ci skip]

refer to rails command instead of rake in environment error

It has been to use an overall rails command in ea4f0e2b, in order to unify.

Fix discrepancies in associations guide [ci skip]

- Followup of https://github.com/rails/rails/commit/71ff088a09d429657877ddfb58985d30df63fc8a

`ApplicationRecord` instead of  `ActiveRecord::Base` in Association G…

Forgot to remove it, when I changed the expectations in 88881d2b.

If running `bin/rails t test/models/bunny_test.rb:` we'd implicitly run all the
tests in the bunny test. I now highly doubt that people would ever put in a line
filter without a line *and* want that to mean run all tests in that file.

Instead, change regex to require a line digit after the colon, so runs without a
line at the end would fail to require the test file.

This also has the side benefit of breaking requiring a file with many colons:
`bin/rails t test/models/bunny_test.rb:::::::::::::4`

Think this means I've had enough colonoscopy to last me through the year :)

Changed options for find_each and variants to have options start/finish

CodeStatistic will now ignore hidden files:

- Modify the default regex to not match hidden files

Association Guide replaces Order as example with Author-Book Example …

fixes #21500

Add clarification about `first` and `last` behavior when using `order` [ci skip]

Checked in changes to Gemfile.lock on latest master

Updated the guides for having a distinct has_many through at the data…

[ci skip] Improve Action Cable configuration explanations

The current example

    add_index :person_articles, :article, unique: true

Does not work, the `:article` column does not exist as it will be
a join table (based on the prior example) so should use :article_id

The documentation seems to suggest that it will allow an article to
be added only once to a person via the join table, what actually
occurs is that it only allows the article to be added to one person,
at which point it should be a `belongs_to` association.

Also changed the new example to use readings based on the prior example

Explain how HStore columns can be queried [ci skip]