This makes the tests inside `migration_test.rb` order independent.
The assignments to `Reminder.table_name_prefix` and `Reminder.table_name_suffix`
previously leaked and had impact on following test cases.

This patch isolates the assignments on a throw-away subclass.

This solves order dependent issues where the last test
leaked the query cache state. This resulted in the following error:

```
QueryCacheExpiryTest#test_cache_is_expired_by_habtm_delete [test/cases/query_cache_test.rb:275]:
not all expectations were satisfied
unsatisfied expectations:
- expected exactly twice, invoked once: #<ActiveRecord::ConnectionAdapters::SQLite3Adapter:0x7f93e0c65838>.clear_query_cache(any_parameters)
```

This fixes test order issues.

any line number maths

This has been added 9 years ago in
a677da20, and removed 6 years ago in
38f8252e.

Use single quotes in generated files

https://github.com/rails/rails/blob/e64a83cdbd3ce836f3339c600c1006b20c23d8fd/activerecord/test/cases/relation/merging_test.rb#L80-91

rather than allocating a new Relation, just make the AST directly

Conflicts:
	activerecord/test/cases/adapters/sqlite3/sqlite3_adapter_test.rb

This fixes broken `rake test_sqlite3_mem` suite for Active Record.
The problem is that that the old database with the schema is lost
when establishing a new connection. Upon reconnting we are left
with a blank database and tests down the line start failing.

sqlite >= 3.8.0 supports partial indexes

Active Record's subclass_from_attributes shouldn't assume :type is for STI unless there is a type column.

The `subclass_from_attrs` method is called even if the column specified by
the `inheritance_column` setting doesn't exist. This prevents setting associations
via the attributes hash if the association name clashes with the value of the setting,
typically `:type`. This worked previously in Rails 3.2.

Example:

    class Conversation < ActiveRecord::Base
      enum status: [ :active, :archived ]
    end

Before:

    Conversation::STATUS # => { "active" => 0, "archived" => 1 }

After:

    Conversation.statuses # => { "active" => 0, "archived" => 1 }

Single quotes for controller generated routes. This is more consistent with all other Rails generated code.

Fix fields_for documentation with index option [ci skip]

- fields_for documentation with index option was wrong.
- It does not work with passing model as it is.
- Changed the example by passing id of the address object.
- Fixes #13125.

[ci skip] Grammar correction

Set NameError#name

[ci skip] Added alias to CSRF

Write routes in route.rb with single quotes

    get 'welcome/index'

instead of

    get "welcome/index"

It's not public API, but is not private scoped.

"serie" => "series"

More to come.