How to add variables from the Rails controller(or view) to be rendered in the Layout?

[yatish27]

I want the header title to be dynamic. It is defined/rendered in the ApplicationLayout, but the value needs to be passed from the controller or corresponding view.

In Erb, I would have yield(:title) in the layout and in the view call content_for(:title).

How to do this in Phlex-rails?

[mhenrixon]

I ended up doing the following:

class ConsultingLayout < ApplicationLayout
  def template(&)
    render LayoutComponent.new(
      theme: "dark",
      header: "consulting/header",
      meta_tags: {},
      &
    )
  end
end

# NOTE: Base class needs to be a phlex rails layout to work
class ApplicationLayout < ApplicationView
  include Phlex::Rails::Layout
end


class LayoutComponent < ApplicationView
  include Phlex::Rails::Layout

  include Phlex::Rails::Helpers::CSPMetaTag
  include Phlex::Rails::Helpers::ContentFor
  include Phlex::Rails::Helpers::CSRFMetaTags
  include Phlex::Rails::Helpers::JavaScriptImportMapTags
  include Phlex::Rails::Helpers::Routes
  include Phlex::Rails::Helpers::StyleSheetLinkTag

  def initialize(theme:, header:, meta_tags: {})
    @theme     = theme
    @header    = header
    @meta_tags = meta_tags
    super()
  end

  def template(&block)
    doctype

    html(data: { theme: @theme }, class: "min-h-full h-full min-w-full w-full mx-0 my-0 text-base antialiased") do
      head do
        meta(name: "viewport", content: "width=device-width, initial-scale=1, user-scalable=no")
        meta(name: "view-transition", content: "same-origin")
        meta(name: "apple-mobile-web-app-capable", content: "yes")

        csrf_meta_tags
        csp_meta_tag

        stylesheet_link_tag "application", data_turbo_track: "reload", defer: true
        javascript_importmap_tags
     end
  end
end

I tried various other approaches, but since my cosmos project is a static CMS, I preferred it this way.

[davekaro]

I think this solves the problem you are looking for - https://ruby.social/@joeldrapper/111108744062187487. I recall this conversation about setting a page title without the need for content_for.