Turbo Frame Reload Error: “element has a source URL which references itself”

I love Marco's turbo_power library for adding some extra actions to turbo. For example the turbo_frame_reload which should reload a given turbo frame.

But the turbo_frame_reload didn't work in my situation.

I've got an index view which renders all orders in a turbo-frame (with pagination).
Pressing a button next to an order should tag the order and reload the orders page.
Tagging is an action in other controller, which doesn't know anything about this order screen. But after tagging it should refresh the turbo frame with the orders.

I thought this could be easy by refreshing the turbo_frame with a turbo_stream action turbo_frame_reload. This only works if the frame has a src attribute in it.

When I set src on the this frame I get the error: element has a source URL which references itself. So this isn't working.

Workaround I created for now is the following.

I add an extra turbo_stream action named: turbo_frame_reload_with_data. This sets the source on the attribute data-src when the src attribute is empty/missing. (that's on the initial load).

So define the turboframe like this:

<%= turbo_frame_tag :orders, data_src: request.original_url do %>
.. content .. 
<% end %>

To make this work the following code is added to the application.js, adding a custom turbo-stream action.
This action sets the src of the turbo-frame when a turbo_frame_reload_with_data action is invoked

Turbo.StreamActions.turbo_frame_reload_with_data = function() {
  this.targetElements.forEach((element) => {
    let src = element.getAttribute('src') || element.getAttribute('data-src')
    element.src = ''
    element.src = src
  })
}

Note: Always setting src with data-src doesn't work. The data-src isn't updated on turbo-frame updates, only the src-flag is.

To make the rails experience nicer, a helper is added to the turbo_stream tag builder.

module TurboStreamActionsHelper
  def turbo_frame_reload_with_data(target = nil, **attributes)
  custom_action :turbo_frame_reload_with_data, target:, attributes:
  end
end
Turbo::Streams::TagBuilder.prepend(TurboStreamActionsHelper)

In the controller performing the action, I render the following turbo-stream action. To refresh after this, the following can be returend.

render turbo_stream: turbo_stream.turbo_frame_reload_with_data('orders'),

References

Ruby remove ternary conditions

Somethimes you want to do something conditionally depending on a boolean.
(I don't like the double question mark in ternary-if)

For example:

# add a class to an element
tag.div(class: selected? ? "sample" : nil)

# executing code conditionaly:
if selected? 
    #.. code
end

This code could be rewritten like this:

# add a class to an element
tag.div(class: selected? { "sample" })

# executing code conditionaly: (this could be done, no per se an improvement)
selected? do
    #.. code
end

To use the construct above, give the boolean operation the following content.

  • if a block is given and the condition is true it invokes the block else it returns nil
  • if no block is given, the boolean is returned
def selected?
    return selected? ? yield : nil if block_given?
    @selected
end

:-)

Rails add Turbo / Hotwire to existing sprockets application

Yesterday I've added turbo/hotwire to a big rails application which evolved over several years from rails 3, to 4 to 5 to 6 and now to rails 7.

The 6-7 version updates went pretty smooth. But now we would like to rewrite our javascript-coffeescript kruft to a more modern approach.

The app is very big, so directly replacing everything is virtually impossible. That's why I introduced an incremental approach.

The 7 version is still running sprockets. (Glad I didn't introduce webpacker in version 6, which would have resulted in an even bigger kruft).

New situation

The new situation will keep sprockets for the current javascript/coffeescript, sass css and other assets.

It will introduce esbuild for building the new javascript.

The directory structure used is the following:

  • app/assets/builds: is the output folder of esbuild javascripts
  • app/assets/javascripts: contains the legacy scripts
  • app/javascript: contains the new javascripts

Changes in Gemfile

- gem uglifier
+ gem terser 

+ gem turbo-rails
+ jsbundling-rails
+ stimulus-rails

Configure sprockets / deployment

Sprockets needs to to include the esbuild build directory to embed the new javascript content.
Changes in app/assets/config/manifest.js

+//= link_tree ../build/

Add the build directory to the assets paths in config/initializers/assets.rb

Rails.application.config.assets.paths << Rails.root.join('app/assets/builds')

Uglifier was crashing on production deployment of the esbuild javascript files (those are already handled). This was solved be replacing uglifier with terser in my Gemfile.

This also needs to be enabled in the config/environments/production.rb file.

- config.assets.js_compressor = Uglifier.new(harmony: true)
+ config.assets.js_compressor = :terser

Required legacy javascript changes

Every legacy javascript file that uses the ready eventhandler is replaced by the turbo:load event

- $(document).ready ->
+$(document).on "turbo:load", ->

New javacript changes

The new new javascript files cannot be called application.js because it has the same name as the legacy name. Because the same name is generated to solve this, I use app/javascript/app.js:

// Entry point for the build script in your package.json

import { Turbo } from "@hotwired/turbo-rails"
window.Turbo = Turbo

import "./controllers"

Contents of app/javascript/controllers/index.js

// This file is auto-generated by ./bin/rails stimulus:manifest:update
// Run that command whenever you add a new controller or create them with
// ./bin/rails generate stimulus controllerName

import { application } from "./application"

import LegacyJsController from "./legacy_js_controller"
application.register("legacy-js", LegacyJsController)

Load the new javascripts

Add the new javascript include to the layout template of the project and `views/layouts/application.html.erb'

= <%= javascript_include_tag "application", defer: true %>
+ <%= javascript_include_tag "app", defer: true %>

- <body>
+ <body 'data-turbo'= <%= @turbo ? true : false %>' >

Because Turbo requires 422 status code on invalid form result, I've disabled Turbo by default. I've tried enabling it by default, which worked pretty good except for form-validation errors. And there are a LOT of places this happen, so for the incremental update it's better to slowly convert/change all pages for using turbo.

When a controller-action uses turbo it can set the @turbo variable to true.
The idea it to slowly introduce this to every controller. When I'm confident it works (almost) everywhere this can be inverted/removed.

Add hotwire/turbo to the package.json file

Contents of package.json

{
 "name": "projectname",
 "private": true,
 "dependencies": {
   "@hotwired/stimulus": "^3.0",
   "@hotwired/turbo-rails": "^7.3.0",
   "esbuild": "^0.17.11"
 },
 "scripts": {
   "build": "esbuild app/javascript/*.* --bundle --sourcemap --outdir=app/assets/builds --public-path=assets"
 },
 "version": "0.1.0"
}

(Build with yarn)

Running the app

Running the app now happens via bin/dev which uses Foreman so esbuild automaticly builds the new javascript:

web: unset PORT && bin/rails server
js: yarn build --watch

How it is going

Currently I'm slowly moving legacy javascript methods to stimulus controllers.
Specialised autocomplete-inputs, select2 inputs are converted ony by one to stimulus controllers.

My experience is that simulus is very good in auto-enabling inputs on loading ajax content.
Even my legacy html-updates via ajax are updated by stimulus when they are introduced into the DOM.
I really like this solution, it's possible to keep the old legacy javascript running and build new things with the turbo/stimulus approach

Install postgresql in FreeBSD jail enable sysvipc

Installen postgresql on a FreeBSD jail can result in an error when intializing the database.

 service postgresql initdb
running bootstrap script ... 2023-02-24 10:21:41.757 CET [29388] FATAL:  could not create shared memory segment: Function not implemented
2023-02-24 10:21:41.757 CET [29388] DETAIL:  Failed system call was shmget(key=37383, size=56, 03600).

By default shared memory via sysvipc is not allowed.

sysctl security.jail.sysvipc_allowed
#=> security.jail.sysvipc_allowed: 0

To solve this enable sysvipc for the given jail...
For bastille this can be added to the config file: /usr/local/bastille/jails/jailname/jail.conf

allow.sysvipc = 1;

Restart jail.

sysctl security.jail.sysvipc_allowed
#=> security.jail.sysvipc_allowed: 1

Rails ActiveStorage import on Mac OS X, missing files

Capistrano-db-tasks is a nice tool to pull production data to the local environment. This nicely imports all SQL data and imports the activestorage files from the /storage folders to the development environment.

When importing the active storage files, not all blob-files are imported. So you get missing file on your local machine. Which is not very desirable, certainly when you are working on a rails upgrade and want to test if everything is working.

I'm using a MacOS X development machine. By default OS X uses a case insensitive filesystem (APFS).

The production machine uses FreeBSD or Linux as OS. Which has a case sensitive filesystem.

ActiveStorage generate case sensitive filenames by default (Why!?!). So you can have a folder 'xE' and 'Xe', which are 2 different folders on BSD/Linux, but not on my Mac.

Today I configured a solution suggested by Brian Boyko: https://brianboyko.medium.com/a-case-sensitive-src-folder-for-mac-programmers-176cc82a3830

Mounting a case-sensitive container. '/Volumes/casesensitive'

Via disutility you can create a case-sensitive APFS container. This container shares the space of you main disk. But is case-sensitive.

I use this container to link my storage folders. (I don't have the need to have a case sensitive code directory) .
This is extra nice, because the gigantic storage files aren't stored in my projects folder anymore.

ln -s /Volumes/casesensitive/project/storage ~/project/storage