Revise the require in the test command to use `active_support/testing/autorun`
and spare us the minitest spec syntax as detailed in 5da4d514.

Also move the require to the top of the file for consistency with the rest of
Rails' requires across the project.

Fix code formatting in `#save` RDoc [ci skip]

Noticed that the `validate: false` option for `ActiveRecord::Persistence#save` and `#save!` were not formatted as code like the other examples in the documentation.

AS => Active Support [ci skip]

Fix ActiveSupport::TimeWithZone#in

Previously calls to `in` were being sent to the non-DST aware
method `Time#since` via `method_missing`. It is now aliased to
the DST aware `ActiveSupport::TimeWithZone#+` which handles
transitions across DST boundaries, e.g:

    Time.zone = "US/Eastern"

    t = Time.zone.local(2016,11,6,1)
    # => Sun, 06 Nov 2016 01:00:00 EDT -05:00

    t.in(1.hour)
    # => Sun, 06 Nov 2016 01:00:00 EST -05:00

support minitest after_run

Only search fixture_path for files that can't be found directly

When passed an already-valid file name, prepending the path is likely to
create problems.

This is particularly relevant for #26384, which adds fixture_path
handling to test classes that previously didn't have it: any existing
caller must have been manually locating the file, and we don't want to
break them.

Add #25546 and #25817 to changelog [ci skip]

Fix docs for allowed params to `get` in controller tests  [ci skip]

Fixes #26602

Relevant method documentation:

https://github.com/rails/rails/blob/abe3da9f12710ea85be69b17172bef41220037fc/actionpack/lib/action_dispatch/testing/integration.rb#L14-L43

Serialize JSON attribute value nil as SQL NULL, not JSON 'null'

Test: JSON attribute value nil can be used in where(attr: nil)

Add changelog entry

Prevent circular require of proxy_wrappers.rb, Fixes #26430

Return true if attribute is not changed for update_attribute

- If the attribute is not changed, then update_attribute does not run
  SQL query, this effectively means that no change was made to the
  attribute.
- This change was made in https://github.com/rails/rails/commit/0fcd4cf5
  to avoid a SQL call.
- But the change resulted into `nil` being returned when there was no
  change in the attribute value.
- This commit corrects the behavior to return true if there is no change
  in attribute value. This is same as previous behavior of Rails 4.2
  plus benefit of no additional SQL call.
- Fixes #26593.

fix formatting of `define_callbacks` doc [ci skip]

Single backticks don't work with rdoc.

Fix memoization bug on ActionDispatch::TestRequest#request_method=

TestRequest have been overrriding request_method setter since 2009,
but the actual implementation in Request (not TestRequest) has been
changed since that. Now it's also using @request_method instance
variable to keep the state.

The override in TestRequest have not been calling `super`, which caused
a bug that after accessing #requst_method the value was memoized and
then we've never been able to change it anymore:

```
req = ActionDispatch::TestRequest.create
puts "was: #{req.request_method}" # memoized here
req.request_method = "POST"
puts "became: #{req.request_method}"
```

output:

```
was: GET
became: GET
```

Since the whole purpose of overriding the setter in TestRequest is to
upcase it, I'm changing it to `super(method.to_s.upcase)`

add check of argument

[ci skip] Replace to closing tag

Restore missing Gemfile.lock entries

These lines were lost in https://github.com/rails/rails/commit/12d5c210#diff-e79a60dc6b85309ae70a6ea8261eaf95L191.

fix link to `resque` [ci skip]

`1-x-stable` branch does not exist, `master` is 1.x branch.
Ref: http://words.steveklabnik.com/rescuing-resque-again

Always store errors details information with symbols

When the association is autosaved we were storing the details with
string keys. This was creating inconsistency with other details that are
added using the `Errors#add` method. It was also inconsistent with the
`Errors#messages` storage.

To fix this inconsistency we are always storing with symbols. This will
cause a small breaking change because in those cases the details could
be accessed as strings keys but now it can not.

The reason that we chose to do this breaking change is because `#details`
should be considered a low level object like `#messages` is.

Fix #26499.

[Rafael Mendonça França + Marcus Vieira]

Reduce array allocation when `where` with passed hash

use rails command in restart task test

Remove unnecessry `alias uniq distinct` for collection association

[ci skip] Fixed commas according to Oxford comma in rdoc and guides