for blank?

Rename the I18n keys for associations' restrict_dependent_destroy errors

Removed information about creating database [ci skip]

Rails 4.0 release notes. Explain major features added and removed.

- As default index page is no longer in public folder, rails hits the
  welcome controller in railties for index action
- If the database is not created or username and password are
  incorrect in database.yml, those errors are first shown before index
  action succeeds
- welcome#index succeeds iff the database is created with correct
  details in database.yml
- So this information about creating database is not required in the
  index template

Extract verbs array from helper to a contant

Fix test name typos

Upgrade guide. Renaming Indexes on tables. [ci skip]

https://github.com/rails/rails/commit/39eef1a565ef02e4dabc0811ef1bf4547ff9a60e#commitcomment-3672522

Closes #11498.

remove duplication in concern_test

Revert "Fix SyntaxError in guides sample code"

Thanks @fxn

This reverts commit f573df32.

The original idea of this documentation was to showcase the feature
where you can remove some only queries attributes with a single
key-value pair.

Closes rails/rails#11362

Thanks @egilburg

[ci skip]

[ci skip]

fixes the test case of that plugins

grammar fix in upgrade documentation

Use latest mysql2.

Fixes #11457

Fixed README link in API

Improve ActiveRecord::QueryMethods#includes docs [ci skip]

It's not immediately clear whether you can pass in multiple relations or
not. After going through the code a bit, I saw that the arguments are
just appended to an array. Also, added nested relations example.

[ci skip]

fixes plugin test for tutorial [ci skip]

[ci skip]

Update bcrypt-ruby stable version to 3.1