fix Rails.application.routes.router.visualizer for router debugging

`CollectionProxy#take` should respect dirty target

Support multiple indexes on the same column when loading the schema

remove "test/mailers" directory when skipping action-mailer

Drop a temporary table before end of a test case

Style/SpaceBeforeBlockBraces
Style/SpaceInsideBlockBraces
Style/SpaceInsideHashLiteralBraces

Fix all violations in the repository.

Fix ActionController::Live deadlock

Eager autoload ActiveRecord::TableMetadata

Fixes a bug that can occur when ActiveJob tries to access ActiveRecord.

Specifically, I had an Active Job process fail on Sidekiq with this error:

```
ActiveJob::DeserializationError: Error while trying to deserialize arguments:
uninitialized constant ActiveRecord::Core::ClassMethods::TableMetadata
Did you mean? ActiveRecord::TableMetadata
```

raised by these lines of code:

```
[GEM_ROOT]/gems/activerecord-5.0.0.1/lib/active_record/core.rb:300 :in `table_metadata`
298
299       def table_metadata # :nodoc:
300         TableMetadata.new(self, arel_table)
301       end
302     end
[GEM_ROOT]/gems/activerecord-5.0.0.1/lib/active_record/core.rb:273 :in `predicate_builder`
[GEM_ROOT]/gems/activerecord-5.0.0.1/lib/active_record/core.rb:290 :in `relation`
```

The problem seems to be that, inside ActiveRecord::Core, the `TableMetadata`
class has not been loaded and, therefore, Rails tries to access the constant
`ActiveRecord::Core::ClassMethods::TableMetadata` which does not exist.

Eager loading `ActiveRecord::TableMetadata` should fix the issue.

@rafaelfranca -- see our Campfire discussion

Fix deadlock that can occur when child live thread tries to load a constant after writing to the stream.

Clarify use of update task on 4.2 and earlier [ci skip]

Remove `find_nth_with_limit_and_offset` private method

Remove odd ivar from ActiveRecord::LogSubscriber

AC::Metal is already defining default encoding as UTF 8, let's reuse it.

remove useless parameter

fix usage of pluralized word [ci skip]

This was used to switch the output colour between log lines, but now the
output colour is based on the type of statement being logged instead.

`find_nth` is protected method, therefore `offset` has not been passed
anywhere. `find_nth_with_limit_and_offset` is unnecessary anymore
because `offset` has not been passed.

Fix `ActiveRecord::FixtureSet` docs [ci skip]

`ActiveSupport::TestCase` was replaced `ActiveRecord::TestCase` in #26150.
But this docs is for rails apps per se, it should be `ActiveSupport::TestCase`.

See https://github.com/rails/rails/pull/26150#discussion_r74710989.

Reason: See https://github.com/rails/rails/pull/26163#issuecomment-239703322

This reverts commit 39effc85.

Consolidate `ActiveRecord::TestCase` and `ActiveSupport::TestCase` in AR test cases

Fixes #26122

add more array methods to straight delegation to speed up calling them

Clarify and fix typos in autoloading disabled section

It's tough for people without the knowledge of where the `get` and
friends integration test helpers are defined to find documentation
for them. Add a link to the main integration test documentation.

* Give the section a header to distinguish it from the general doc.
* Replace backticks with + signs to fit SDoc.
* Use double quoted strings.
* Clarify how `parsed_body` works — it doesn't depend on `as` anymore.

The Guides section about autoloading being disabled was slightly confusing
(#24724) and didn't directly reference the removed feature by name
(config.autoload_paths) making it much harder for someone to search the upgrade
guides for a mention or serendipitously find it via a Google search when running
into autoloading issues.

I also fixed some confusing turns of phrase and a missing word.

/cc @vipulnsward @jvanbaarsen

Fix the documentation for configuring `enable_fragment_cache_logging`…

`#first`, `#second`, ..., `#last` methods respects dirty target. But
`#take` doesn't respect it. This commit fixes the inconsistent behavior.

- It is Action Controller config, not Action View.

Related to #26146

fixes error due to Routes#partitioned_routes being removed

Ensure app/mailers is removed when skipping action-mailer