MissingTemplate upgrading to Rails 7

[jhirn]

Hello. I'm performing an upgrade from Rails 6 -> 7.0.2.3.

I think this is not the right way to do this, but we have an render block in the text that is getting a MissingTemplate error.

subject(:described_view) { render template: "notifications/slack/new_current_coverage_created.md.erb" }

I believe i'm up against some combination of not having the file extension in the file or template argument, using :formats and/or registering a custom handler but wanted to avoid rendering the template in a different way than it currently is so-as to keep the changeset as minimal as possible. Here is the stack trace I get with my code as-is.

     Failure/Error: subject(:described_view) { render template: "notifications/slack/new_current_coverage_created.md.erb" }
     
     ActionView::MissingTemplate:
       Missing template notifications/slack/new_current_coverage_created.md.erb with {:locale=>[:en], :formats=>[:html, :text, :js, :css, :ics, :csv, :vcf, :vtt, :png, :jpeg, :gif, :bmp, :tiff, :svg, :mpeg, :mp3, :ogg, :m4a, :webm, :mp4, :otf, :ttf, :woff, :woff2, :xml, :rss, :atom, :yaml, :multipart_form, :url_encoded_form, :json, :pdf, :zip, :gzip, :json, :xlsx], :variants=>[], :handlers=>[:raw, :erb, :html, :builder, :ruby]}.
     
       Searched in:
         * "/Users/jhirn/src/tflow/core_api/app/views"
         * "/Users/jhirn/.rbenv/versions/3.1.0/lib/ruby/gems/3.1.0/gems/actionmailbox-7.0.2.3/app/views"
     
       Did you mean?  notifications/slack/new_current_coverage_created
                      notifications/slack/new_placement_event_created
                      notifications/slack/new_employer_created
                      notifications/slack/firm_quote_requested
                      notifications/slack/employer_disabled
                      rails/conductor/action_mailbox/inbound_emails/new
    

Here's an example handler I've done in an initializer which registers the handler, but does help with finding the template

Rails.application.config.to_prepare do
  class MarkdownTemplateHandler
    def call(template, source)
      markdown = Redcarpet::Markdown.new(Redcarpet::Render::HTML)

      compiled_source = erb.call(template, source)

      markdown.render(compiled_source).inspect.html_safe
    end

    private

    def erb
      @erb ||= ActionView::Template.registered_template_handler(:erb)
    end
  end

  ActionView::Template.register_template_handler(:md, MarkdownTemplateHandler.new)
end

Any insights are appreciated.

[bopm]

https://stackoverflow.com/a/71069848/511374 so you have to remove .md.erb from your partial reference.