[ci skip] add guide for ActiveModel::Naming
active_record: Type cast booleans and durations for string columns.
Merge pull request #16069 from dylanahsmith/mysql-quote-bool

active_record: Type cast booleans and durations for string columns.
Generate shallow paths for all children of shallow resources.

Prior to this commit shallow resources would only generate paths for
non-direct children (with a nested depth greater than 1).

Take the following routes file.

    resources :blogs do
      resources :posts, shallow: true do
        resources :comments do
          resources :tags
        end
      end
    end

This would generate shallow paths for `tags` nested under `posts`,
e.g `/posts/:id/tags/`, however it would not generate shallow paths
for `comments` nested under `posts`, e.g `/posts/:id/comments/new`.

This commit changes the behaviour of the route mapper so that it
generate paths for direct children of shallow resources, for example
if you take the previous routes file, this will now generate
shallow paths for `comments` nested under `posts`, .e.g
`posts/:id/comments/new`.

This was the behaviour in Rails `4.0.4` however this was broken in
@jcoglan's fix for another routes related issue[1].

This also fixes an issue[2] reported by @smdern.

[1] https://github.com/rails/rails/commit/d0e5963
[2] https://github.com/rails/rails/issues/15783
[ci skip] /sqlite/i --> SQLite
Merge pull request #15958 from aditya-kapoor/active-model-naming-guide

[ci skip] add guide for ActiveModel::Naming
Merge pull request #16057 from akshay-vishnoi/doc_change

[ci skip] /sqlite/i --> SQLite