ActionText

Rails 6 is shipped with a new rich text editor, called ActionText. RailsAdmin can make use of it in two ways.

Setting up the Rails part

Follow the official documentation to configure ActionText.

$ rails action_text:install

class Message < ApplicationRecord
  has_rich_text :content
end

At this point RailsAdmin will use the CDN-delivered ActionText assets and it lacks some features like uploading attachments. You'll see a warning like ActionText assets should be loaded statically... in your browser console as well. To eliminate the warning and get the full features, please proceed to the next section.

Setting up the frontend

The method you should take varies depending on how your application is configured to deliver RailsAdmin assets.

Sprockets with Rails 7.x

RailsAdmin will automatically load required assets. No setup is needed.

Sprockets with Rails 6.x

Since ActionText 6.x doesn't come with the Sprockets-based asset pipeline support, it'll be a bit tricky to set it up correctly. You can refer to a StackOverflow answer.

Alternatively, if you don't need full features you can choose to suppress the warning by:

field :action_text_field do
  warn_dynamic_load false
end

ImportMap

Install the ActionText NPM package.

$ yarn add @rails/actiontext

Add following contents to files within your Rails application.

config/importmap.rails_admin.rb (be sure to use the latest version for each package!)

pin '@rails/actioncable/src', to: 'https://ga.jspm.io/npm:@rails/actioncable@7.0.4/src/index.js'
pin '@rails/actiontext', to: 'https://ga.jspm.io/npm:@rails/actiontext@7.0.4-1/app/assets/javascripts/actiontext.js'
pin '@rails/activestorage', to: 'https://ga.jspm.io/npm:@rails/activestorage@7.0.4/app/assets/javascripts/activestorage.esm.js'
pin 'trix', to: 'https://ga.jspm.io/npm:trix@2.0.0-beta.0/dist/trix.js'

app/javascript/rails_admin.js

import "trix";
import "@rails/actiontext";

app/assets/stylesheets/rails_admin.scss

@import "trix/dist/trix";

Webpacker or Webpack

Install the ActionText NPM package.

$ yarn add @rails/actiontext

Add following contents to files within your Rails application.

app/javascript/packs/rails_admin.js or app/javascript/rails_admin.js

import "trix";
import "@rails/actiontext";

app/javascript/stylesheets/rails_admin.scss or app/assets/stylesheets/rails_admin.scss

@import "trix/dist/trix";

More here