This commit creates structure for Action View gem and is first of a
series of commits extracting Action View from Action Pack.

ActiveModel::Model inclusion chain backward compatibility

Fix 3 typos in Configuration guide

Fix name of nested attributes option include_id

The option to disable including a hidden ID field on a `fields_for` nested association was incorrectly documented as `hidden_field_id` instead of `include_id`

Handle single quotes in PostgreSQL default column values

PostgreSQL escapes single quotes by using an additional single quote.
When Rails queries the column information, PostgreSQL returns the
default values with the escaped single quotes.

#extract_value_from_default now converts these to one single quote each.

Fixes #10881.

Signed-off-by: NJosé Valim <jose.valim@plataformatec.com.br>

This reverts commit 2b817a5e, reversing
changes made to 353a398b.

Conflicts:
	activerecord/CHANGELOG.md

Reason: the build broke

log the sql that is actually sent to the database

If I have a query that produces sql
`WHERE "users"."name" = 'a         b'` then in the log all the
whitespace is being squeezed. So the sql that is printed in the
log is `WHERE "users"."name" = 'a b'`.

This can be confusing. This commit fixes it by ensuring that
whitespace is not squeezed.

fixes #10982

Remove duplicate letter 'a'. [ci skip]

Fixed ActiveModel::Model's inclusion chain

do not load all child records for inverse case

currently `post.comments.find(Comment.first.id)` would load all
comments for the given post to set the inverse association.

This has a huge performance penalty. Because if post has 100k
records and all these 100k records would be loaded in memory
even though the comment id was supplied.

Fix is to use in-memory records only if loaded? is true. Otherwise
load the records using full sql.

Fixes #10509

Fix some activerecord changelog code to be displayed properly as code [ci skip]

Add respond_with location option to docs Edit

`CollectionProxy#include?` returns `true` and `false` as documented.

Removing a repetitive comment and a deprecation warning.

The comment on the +env_config+ method is repetitive, likely to get
outdated, and provides no useful information which cannot be gleamed
from the code. I'm therefore removing it. I'm also refactoring the check
for the presence of a secret_token in the configuration.

This reverts commit 7098d6c9, reversing
changes made to 9ec2e2ee.
This make some tests fail /cc @wangjohn

Creating a class to build the default middleware stack.