use File.exist? instead of File.exists?

Decouple the code from the particular Ruby version.

Reaper has access to threadsafe active? call

context in validation goes through has many relationship

Skips linked folder tests if symlink is invalid

Skips tests on Windows that create files with illegal characters

Fixed an issue where reloading of removed dependencies would cause an un...

Fixed an issue where reloading of removed dependencies would cause an unexpected circular dependency error

Add test case for autosave association with nested attributes.

It should not save the parent record when the nested attributes are
invalid.

Test case to cover #8194.

cc @senny

Since the language in code blocks is inferred, if the code contains tt
tags, the block will be parsed as XML for instance while it is Ruby.

If the test is run in a timezone that is behind UTC it fails because
the time generated is ahead of 0000-01-01 00:00:00. Just increase the
time subtracted so that timezone has no effect.

[Testing Guide] Mention :unauthorized in assert_response explanation [ci skip]

Require action_view to fix missing constant ENCODING_FLAG

Previously, requiring action_view/view_paths did cause an uninitialized
constant error for ENCODING_FLAG, which is defined in action_view.

Fix wordy sentence [ci-skip]

Test for skipping a controller filter set up with a class Part 3

Merge branch 'dump-schema-after-migration-flag' of git://github.com/emilsoman/rails into emilsoman-dump-schema-after-migration-flag

Conflicts:
	activerecord/CHANGELOG.md

* Add a config on Active Record named `dump_schema_after_migration`
* Schema dump doesn't happen if the config is set to false
* Set default value of the config to true
* Set config in generated production environment file to false
* Update configuration guide
* Update CHANGELOG

Follow up to https://github.com/rails/rails/commit/580f0b61dc99c6854fa930a761d28a3ab08163f7#commitcomment-5293470

/cc @chancancode

- Manually applied from #13951.
- Discussion at #13947.
- Removed trailing whitespace from https://github.com/dpmehta02/rails/commit/18044e86af93672dfc38befbe974261e87b3518d

/cc @dpmehta02

Closes #13909

fix interplay of humanize and html_escape