Inserted system_test ones into scaffolding logs [ci skip]

Fix typo for api_app_generator_test

Add missing backticks
Add missing *
Add missing .

Fix format of generator docs [ci skip]

Ensure sum honors distinct on has_many through

Clarify base_class tests on abstract STI vs concrete STI

Add `binary` helper method to fixtures.

Refactor `--api` option of the app generator

Fix guide about command_line [ci skip]

Extract `primary_key` to `AbstractReflection`

Fix `reflection.association_primary_key` for `has_many` association

Allow `serialize` with a custom coder on `json` and `array` columns

Check :scope input in Uniqueness validator

Completes ActiveRecord::Batches.find_each example [ci skip]

Fix asset pipeline guide [ci skip]

When using a has_many through relation and then summing an attribute
the distinct was not being used. This will ensure that when summing
an attribute, the number is only used once when distinct has been used.

ActiveStorage::Filename is a model, so its test case belongs in test/models.

Remove unused `source_type_info` in `RuntimeReflection`

Refactor max-age seconds

Remove duplicated `join_id_for`

Omit additional removing `config/cable.yml` 

Improve plugin generator codebase

Run Active Storage service tests in CI

Optimize routes indentation

Railties updates for frozen string literals.

Add document that you rake test single file by using DB(ex. postgresql)

Show minitest options in test runner help

Fix testing guide [skip ci]

Should escape regexp wildcard character `.`