Make `secrets:edit` run `secrets:setup` if it hasn't already.

Setup config/secrets.yml.enc with template contents for people to edit.

Then generate encryption key and encrypt the initial secrets.

Add ActiveRecord::Relation#or description to guides

Extract `JSONSharedTestCases`

rubocop namespace changes from `Style` to `Layout`

Fix crashing on circular left join references with scoping

`gmail` --> `Gmail`

[ci skip]

[ci skip]fix wrong variable name in docs

Refer https://github.com/bbatsov/rubocop/pull/4278/commits/54166bf76ba76b14f1bbc8a34165f175dbc3f227
for the commit

```
/path/to/rails/.rubocop.yml: Style/CaseIndentation has the wrong namespace - should be Layout
/path/to/rails/.rubocop.yml: Style/CommentIndentation has the wrong namespace - should be Layout
/path/to/rails/.rubocop.yml: Style/EmptyLines has the wrong namespace - should be Layout
/path/to/rails/.rubocop.yml: Style/EmptyLinesAroundClassBody has the wrong namespace - should be Layout
/path/to/rails/.rubocop.yml: Style/EmptyLinesAroundMethodBody has the wrong namespace - should be Layout
/path/to/rails/.rubocop.yml: Style/EmptyLinesAroundModuleBody has the wrong namespace - should be Layout
/path/to/rails/.rubocop.yml: Style/IndentationConsistency has the wrong namespace - should be Layout
/path/to/rails/.rubocop.yml: Style/IndentationWidth has the wrong namespace - should be Layout
/path/to/rails/.rubocop.yml: Style/SpaceAfterColon has the wrong namespace - should be Layout
/path/to/rails/.rubocop.yml: Style/SpaceAfterComma has the wrong namespace - should be Layout
/path/to/rails/.rubocop.yml: Style/SpaceAroundEqualsInParameterDefault has the wrong namespace - should be Layout
/path/to/rails/.rubocop.yml: Style/SpaceAroundKeyword has the wrong namespace - should be Layout
/path/to/rails/.rubocop.yml: Style/SpaceAroundOperators has the wrong namespace - should be Layout
/path/to/rails/.rubocop.yml: Style/SpaceBeforeFirstArg has the wrong namespace - should be Layout
/path/to/rails/.rubocop.yml: Style/SpaceBeforeBlockBraces has the wrong namespace - should be Layout
/path/to/rails/.rubocop.yml: Style/SpaceInsideBlockBraces has the wrong namespace - should be Layout
/path/to/rails/.rubocop.yml: Style/SpaceInsideHashLiteralBraces has the wrong namespace - should be Layout
/path/to/rails/.rubocop.yml: Style/SpaceInsideParens has the wrong namespace - should be Layout
/path/to/rails/.rubocop.yml: Style/Tab has the wrong namespace - should be Layout
/path/to/rails/.rubocop.yml: Style/TrailingBlankLines has the wrong namespace - should be Layout
/path/to/rails/.rubocop.yml: Style/TrailingWhitespace has the wrong namespace - should be Layout
```

Bump RuboCop to 0.49.0 and fix offences

Update Rails API Application guide to match current code [ci skip]

Update information on using Gmail when 2FA is in use [ci skip]

Follow up of #25702.

[ci skip]fix wrong method name in docs

Fix select tag helper used with Enumerable choices

Make helper methods in tests to private

Both reference id and type should be `NOT NULL` if `null: false` is specified

Set `Capybara.app_host` through `host!`

Adding Foreing Key - Don't worry about building the identifier if name is already present.

Remove a duplicate test of inverse_associations_test in AR

Remove unused `JoinPart#name`

Remove rubygems version lock

Remove unused `left_joins_values` generation

Refactor making join constraints

More friendly exception in nested attributes

Needed back when we attempted to wait for editors, but now we expect
users to pass a -w flag to their $EDITOR.

This method was only used in the Rails tests and not by other methods in
the Rails simulator. Because it's a no-doc'd class it should be safe to
remove without deprecation.

The only difference between `make_inner_joins` and
`make_left_outer_joins` is the `join_type`.

This was added at #22125 but `left_joins_values` is never used.

This version lock added by 3d890b66.
But original issue is fixed with bundler 1.15.

Ref: https://github.com/rubygems/rubygems/issues/1911#issuecomment-300148516