This method needs to be protected.

Fix `JoinDependency` with using a custom table

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support `-` as an argument to `rails runner`

in Rails 4.0, you could use `/dev/stdin` on both Linux and Mac, but with
the switch to Kernel.load in Rails 4.1, this broke on Linux (you get
a LoadError). Instead, explicitly detect `-` as meaning stdin, then
read from stdin explicitly, instead of performing file gymnastics. This
should now work on any platform uniformly.

Passing a script via stdin is useful when you're sshing to a server,
and the script you want to run is stored locally. You could theoretically
pass the entire script on the command line, but in reality you'll run
into problems with the command being too long.

Clarifies the intent that aren't just loading the
model but really caring about triggering the on_load
callbacks.

Without this fix, `JoinDependency` doesn't use a custom table alias:

```
% ARCONN=sqlite3 be ruby -w -Itest test/cases/relations_test.rb -n test_using_a_custom_table_with_joins_affects_the_wheres
Using sqlite3
Run options: -n test_using_a_custom_table_with_joins_affects_the_wheres --seed 14531

E

Error:RelationTest#test_using_a_custom_table_with_joins_affects_the_wheres:
ActiveRecord::StatementInvalid: SQLite3::SQLException: no such column: posts.author_id: SELECT  "omg_posts".* FROM "posts" "omg_posts" INNER JOIN "authors" ON "authors"."id" = "posts"."author_id" WHERE "omg_posts"."title" = ? LIMIT ?
```

Extract `NullRelationTest` from `RelationTest`

Remove outdated `test_scoped_responds_to_delegated_methods`

Correctly handle frozen options for ActiveRecord::Serialization#seria…

Fix HashWithIndifferentAccess#default when include?(nil)

Fix `where` with a custom table

`Persistence#delete` should not be affected by scoping

The implementation of HashWithIndifferentAccess#default didn't
distinguish `default` from `default(nil)`, which caused an incorrect
result for `default` if `nil` was used as a key.

Define HashWithIndifferentAccess#dig so that hackery that behaves
differently from Hash#default can be removed from
HashWithIndifferentAccess#default.

Without this fix, SELECT clause doesn't use a custom table alias name:

```
% ARCONN=sqlite3 be ruby -w -Itest test/cases/relations_test.rb -n test_using_a_custom_table_affects_the_wheres
Using sqlite3
Run options: -n test_using_a_custom_table_affects_the_wheres --seed 31818

E

Error:
RelationTest#test_using_a_custom_table_affects_the_wheres:
ActiveRecord::StatementInvalid: SQLite3::SQLException: no such table: posts: SELECT  "posts".* FROM "posts" "omg_posts" WHERE "omg_posts"."title" = ? LIMIT ?
```

`self.class.delete` is delegated to `all` and `all` is affected by
scoping. It should use `unscoped` to not be affected by that.

Add bootsnap to default Gemfile

Remove unused `Mutex_m` in Active Model

Scrub the invalid paramter value before using it in the error

Bootsnap precomputes load path resolution and caches ruby ISeq
and YAML parsing/compilation, reducing application boot time by
approximately 50% on supported configurations.

You should be able to safely use the String error message. So when
finding the paramter has an invalid encoding we need to remove the
invalid bytes before using it in the error. Otherwise the caller might
get another Encoding error if they use the message.

Fixing  "Adding Member Routes" documentation

Between 4.2 and 5.0 the behavior of how multiparameter attributes
interact with `_before_type_cast` changed. In 4.2 it returns the
post-type-cast value. After 5.0, it returns the hash that gets sent to
the type. This behavior is correct, but will cause an issue if you then
tried to render that value in an input like `text_field` or
`hidden_field`.

In this case, we want those fields to use the post-type-cast form,
instead of the `_before_type_cast` (the main reason it uses
`_before_type_cast` at all is to avoid losing data when casting a
non-numeric string to integer).

I've opted to modify `came_from_user?` rather than introduce a new
method for this as I want to avoid complicating that contract further,
and technically the multiparameter hash didn't come from assignment, it
was constructed internally by AR.

Close #27888.

Add documentation for class_attribute default option

Remove useless `arel_engine`

This change was introduced by #18109. The intent of that change was to
specifically apply `unscoped`, not to allow all changes to
`current_scope` to affect the join. The idea of allowing `current_scope`
to affect joins is interesting and potentially more consistent, but has
sever problems associated with it. The fact that we're specifically
stripping out joins indicates one such problem (and potentially leads to
invalid queries).

Ultimately it's difficult to reason about what `Posts.joins(:users)`
actually means if it's affected by `User.current_scope`, and it's
difficult to specifically control what does or doesn't get added. If we
were starting from scratch, I don't think I'd have `joins` be affected
by `default_scope` either, but that's too big of a breaking change to
make at this point.

With this change, we no longer apply `current_scope` when bringing in
joins, with the singular exception of the motivating use case which
introduced this bug, which is providing a way to *opt-out* of having the
default scope apply to joins.

Fixes #29338.

Make the order of Hash#reverse_merge! consistent with HashWithIndifferentAccess

`arel_engine` is only used in `raise_record_not_found_exception!` to use
`engine.connection` (and `connection.visitor`) in `arel.where_sql`.

https://github.com/rails/arel/blob/v8.0.0/lib/arel/select_manager.rb#L183

But `klass.connection` will work as expected even if not using
`arel_engine` (described by `test_connection`). So `arel_engine` is no
longer needed.

Enable `Layout/FirstParameterIndentation` cop

Set `RAILS_ENV` before load application file

We have some indentation cops. But now there is a little inconsistent
params indentations. Enable `Layout/FirstParameterIndentation` cop to
prevent newly inconsistent indentation added and auto-correct to
existing violations.

Since #29725, load application file when `dbconsole` command is executed.
However, if do not set `RAILS_ENV` before reading the application file,
can not connect to the env specified in option, so added the setting
of `RAILS_ENV`.

Use frozen string literal in activemodel/

Remove unused requires