Display notice in index.html pages in scaffolded generated views

As we are setting notice in destroy action we should display that

For more information see https://github.com/rails/rails/pull/14044
And https://github.com/rails/jbuilder/pull/191

closes #14044

This has changed since around 2b1500d6

Fix guide. sample code syntax error.[ci skip]

Do not rely on the column type when quoting infinity

Use the type object for type casting HStore columns

[ci skip] Changes some wording to better foreshadow what is coming up later

Fix typo in comment

Change the JSON renderer to enforce the 'JS' Content Type

The controller can set the response format as 'JSON' before the renderer code be
evaluated, so we must replace it when necessary.

Fixes #15081

(This is a manual merge of #9102)

This is a follow up to #16024.

`DateTime#to_f` now preserves fractional seconds.

Previously this method always returns `.0` in the fractional part. This commit
changes it to preserve the fractional seconds instead.

Fixes #15994.

automatically include ActiveModel::Validations when include ActiveModel::SecurePassword

Move pk initialization logic onto `AttributeSet`

Conflicts:
	activerecord/lib/active_record/attribute_set.rb

Quote range strings when quoting PG ranges

The test case for CVE-2014-3483 doesn't actually send the generated SQL
to the database. The generated SQL is actually invalid for real inputs.

Fix CVE-2014-3483 and protect against CVE-2014-3482.

This should prevent some anxiety readers may experience when the doc goes into something different than what it just explained. Also clarifies a statement about priority in engines and application environments

[ci skip] fixes double `the`

[ci skip] more clarifications

[ci skip] changes from tics to quotes

Don't error when `dup`ing a record with no PK

flash doesn't pass objects #15522 [ci skip]

Better encapsulates its internals from `ActiveRecord::Base`.

Revert "Merge pull request #15394 from morgoth/fix-automatic-maintaining-test-schema-for-sql-format"

This reverts commit 46139d33, reversing
changes made to 8f247871.

Conflicts:
	activerecord/CHANGELOG.md

Add regression tests for keys on nested associations

This adds the regressions tests from issue #15893 to
master. It's checking that both strings and symbols are
accepted as keys for nested associations.

[ci skip] Fixed the documentation of xml_http_request? (aka xhr?)