Currently custom attributes are always qualified by the table name in
the generated SQL wrongly even if the table doesn't have the named
column, it would cause an invalid SQL error.

Custom attributes should only be qualified if the table has the same
named column.

Zeitwerk integration

Support testing of non-ActionDispatch-routed apps.

If generate application without specified options,`actioncable` and
`activestorage` loads by default.

use ProxyPattern to match for ActiveSupport::Notifications fanout/unsubscribe

Document queue_as block arguments and their use

Currently, we only document the use case for ActiveJob's `queue_as` block
arguments in [Rails Guides][1]. It seems necessary to document them in the API
docs as well considering how useful and powerful this option is.

[1]: https://edgeguides.rubyonrails.org/active_job_basics.html#queues

[ci skip]

The implicit delegation in the migration class is to be logged. It is
not intended in the migration compatibility, so it should be avoided.

Fixes #35224.

Allow deprecated non-symbol access to nested `config_for` hashes

Optimized namespaces_to_paths method.

The assertion from the previous PR had the expected and the actual
values in the wrong order, so when a test failed the error message was
confusing.

This commit fixes the problem by switching the order.

A change to `Rails::Application.config_for` in
https://github.com/rails/rails/pull/33815 and
https://github.com/rails/rails/pull/33882 has altered the behaviour of
the returned object in a breaking manner. Before that change, nested
hashes returned from `config_for` could be accessed using non-symbol keys.
After the change, all keys are recursively symbolized so non-symbol access
fails to read the expected values.

This is a breaking change for any app that might be relying on the
nested hashes returned from `config_for` calls, and thus should be
deprecated before being removed from the codebase.

This commit introduces a temporary `NonSymbolAccessDeprecatedHash` class
that recursively wraps any nested hashes inside the `OrderedOptions`
object returned from `config_for` and issues a deprecation notice when a
non-symbol based access is performed.

This way, apps that are still relying on the ability to access these
nested hashes using non-symbol keys will be able to observe the
deprecation notices and have time to implement changes before non-symbol
access is removed for good.

A CHANGELOG entry is also added to note that non-symbol access to nested
`config_for` hashes is deprecated.

Clarify collection proxy docs

This reverts commit b46601b5, reversing
changes made to 4e6737f1.

Correct JavaScript guide example

Avoid extra package install

SQLite3: Implement `add_foreign_key` and `remove_foreign_key`

This reverts commit 141f50ef, reversing
changes made to 317efa5c.

Reason: `add_foreign_key` and `remove_foreign_key` are implemented at
#35212.

[ci skip]

I implemented Foreign key create in `create_table` for SQLite3 at
#24743. This follows #24743 to implement `add_foreign_key` and
`remove_foreign_key`.
Unfortunately SQLite3 has one limitation that
`PRAGMA foreign_key_list(table-name)` doesn't have constraint name.
So we couldn't implement find/remove foreign key by name for now.

Fixes #35207.
Closes #31343.

Some tests are running yarn install during the test.
The directory used for isolation test is not subject to yarn workspace,
and it occurs because the required package is not installed.
In order to avoid this, I fixed all necessary packages to be installed
before run test and use symlink to `node_modules`.

This is a bit complicated, as `yarn install` needs to be run in a specific
directory before running the test.
However, running `yarn install` every time run the test is expensive
when testing locally and should be avoided.

This reverts commit 38f9e41f, reversing
changes made to 5e493c3b.

Reason: The ajv@6.9.1 was released that fixes issue.

Swap `#users` jQuery selector to correct position and prevent the escaping of HTML.

Avoid ajv@6.9.0 for now

Because ajv@6.9.0 does not work with webpack.
Ref: https://github.com/epoberezkin/ajv/issues/941

https://travis-ci.org/rails/rails/jobs/491045821#L1528-L1531

Do not allow to add column without column name

Fix memory leaks in development

It makes to ease to handle all short-hand methods (e.g. validates
arguments etc).

This commit exposes all system wide view paths so that we can clear
their caches.