Use File.join to better integrate fixture_path in fixture_file_upload.

Cache digest opt out cleanup

Instead of deleting the skip_digest option flag, this changes the method to merely check the
key. This change is because of a discussion in this thread:

https://github.com/rails/rails/pull/8317

This commit also makes #fragment_name_with_digest private due to its
functionality being subsumed by #cache_fragment_name.

This reverts commit 33b29e01, reversing
changes made to ac8c7293.

Reason:

https://github.com/rails/rails/pull/4684#commitcomment-920313

default source in Gemfiles to :rubygems rather than hardcoding the URL

No sort Hash options in #grouped_options_for_select

* I guess this would be the preferrable default for Bundler
* current version of Bundler converts :rubygems into 'http://rubygems.org', not https://,
  and that will help those who are working on a very poor network environment that doesn't allow SSL

Fix Strong Parameters docs [ci skip]

It's only possible to inherit from ActiveRecord::Base and not include
it.

unshift html-scanner into $LOAD_PATH rather than append

Unused variable warning removed

empty rails gem's require_paths

This file was using mime_types before load the Mime::Type class.
When trying to register first Mime::Type it load mime_type that loads
mime_types in the end.

Requiring mime_type ensure that we have the class definition and the
mime types

We are already in the AR namespace, there's no way for it to be
undefined. See the cousin commit 13e72db7

Refactor a bit teardown fixtures to avoid two conditionals.

Accept symbols as #send_data :disposition value

Length validation handles correctly nil. Fix #7180

Conflicts:
	activemodel/CHANGELOG.md

@steveklabnik can't spell 'distance.'

Add changelog for #7997.

This was forgotten when we did the merge.

Corrects typo in test name [ci skip]

Log output from activemodel's railtie_test directly to STDOUT.

There's no logging going on here, but since we initialize the app, the
logger is set and the folder is automatically created. With this change,
the default logger is not created, so there is no logging folder anymore.

Conflicts:
	activemodel/test/cases/railtie_test.rb

after this patch, running the tests in activemodel will no longer
create an untracked log/ folder inside of activemodel

Don't run explain on slow queries for database adapters that don't support it

make sure that individual parts `ActiveModel` can be required by itself

When nil or empty string are not allowed, they are not valid.

Move the routes for each test inside the test method so that
it's easier to see which routes are applicable to which test.

To ensure that each test wasn't invalidated the changes were
done by first removing all of the routes, ensuring that all
of the tests failed and then adding the routes back to each
test one by one. One test for `assert_recognizes` was
removed as it wasn't actually testing the defined routes and
is now tested more thoroughly in routing_assertions_test.rb.

One downside is that the test suite takes about 1s longer
due to having to using `method_missing` for handling the url
helpers as using `include url_helpers` isn't isolated
for each test.

Use Class.new with a block instead of tap to configure it.

assert_template: validating option keys

It only handles the keys locals, partial, layout and count.

    assert_template(foo: "bar") # raises ArgumentError
    assert_template(leiaute: "test") # raises ArgumentError

Add explicit opt-out for fragment cache digesting