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This gem activeadmin-wysihtml5 (available at https://github.com/stefanoverna/activeadmin-wysihtml5) from Stefano Verna gives you a simple way to add a WYSIWYG interface to ActiveAdmin inputs.

But I was needing just the WYSIWYG part, without the image upload feature. In this case, the solution was just not add the image item in the commands list in ActiveAdmin's configuration.

# /app/admin/model_name.rb
ActiveAdmin.register ModelName do
 form do |f|
 f.inputs do
 f.input :content,
 as: :wysihtml5,
 commands: %i(bold italic underline ul ol outdent indent link source),
 blocks: %i(),
 height: :large
 end

 f.actions
 end
end

Since activeadmin-wysihtml5 registers a new model - called Asset -, a undesired link was keeped at the top of administration interface. To hide it:

# /app/admin/asset.rb
ActiveAdmin.register Asset do
 menu false
end

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