Active Admin CKediter

Add it to your Gemfile

gem 'activeadmin_ckeditor'

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Follow the instructions for galetahub/ckeditor (gem, mount in routes and rails generate for your file uploads if wanted), then add the following to /config/initializers/active_admin.rb

# To load a javascript file:
config.register_javascript 'ckeditor/init.js'

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In your resource you'll need to add to your form:

form do |f|
  f.inputs do
    f.input :foo
    f.input :bar, :as => :ckeditor
  end
  f.actions
end
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I've also found it necessary to add to app/assets/stylesheets/active_admin.css.scss to fit it to on the form:

.cke_chrome {
  width: 79.5% !important;
  overflow: hidden;
}
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index do
    selectable_column
    id_column
    column :descrption.html_safe
    column :body.html_safe
end
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URL: https://github.com/activeadmin/activeadmin/wiki/Ckeditor-integration