Extensible layout
---
Expose how we render the HTML _surrounding_ rich text content as an
extensible `layouts/action_text/contents/_content.html.erb` template to
encourage user-land customizations, while retaining private API control
over how the rich text itself is rendered by moving the
`#render_action_text_content` helper invocation to the
`action_text/contents/_content.html.erb` partial.
Extensible Attachable `#to_attachable_partial_path`
---
When an application declares a canonical partial for a record, there is
no way to override which partial is used when transformed to Rich Text.
For example, a default `Person < ApplicationRecord` instance returns
`"people/person"` from calls to `#to_partial_path`, resulting in the
`app/views/people/_person.html.erb` partial being rendered.
Prior to this change, when encountering an `<action-text-attachment
sgid="...">` element, ActionText retrieved the corresponding
`Attachable` instance (usually an `ActiveRecord::Base` instance) and
transformed it to rich text HTML by rendering the partial that
corresponds to its `#to_partial_path`.
This proposed change instead invokes
`Attachable#to_attachable_partial_path`. By default,
`#to_attachable_partial_path` is an alias for `#to_partial_path`.
Guides
---
Extend the `guides/action_text_overview` document to
describe how to customize these templates, and to better illustrate how
ActionText::Attachable instances are rendered into HTML.
This commit allows Action Text to be used without having an
ApplicationController defined. In doing so, it also fixes Action Text
attachments to render the correct URL host in mailers.
It also avoids allocating an ActionController::Renderer per request.
Fixes#37183.
Fixes#35578.
Fixes#36963.
Closes#38714.
Co-authored-by: Jeremy Daer <jeremydaer@gmail.com>
In most cases it works now without explicit require because it's accidentally required through
active_support/core_ext/date_and_time/calculations.rb where we still call `try`,
but that would stop working if we changed the Calculations implementation and remove the require call there.
If the [`action_text.helper` initializer][0] runs after
`ActionController::Base` has been loaded, but before the
`rails-html-sanitizer` gem has been `require`d, then the reference to
the constant `Rails::Html` in the body of the
`ActionText::ContentHelper` module raises an `uninitialized constant`
exception.
[0]: 2170338239/actiontext/lib/action_text/engine.rb (L31-L35)
