I’ll introduce how to set favicon.ico using Ruby on Rails’ favicon_link_tag helper method.

Setting Favicon with favicon_link_tag

Rails has a helper method called favicon_link_tag, so you can use this to set a favicon in template files.

• favicon_link_tag - Reference - Rails Documentation
• favicon_link_tag (ActionView::Helpers::AssetTagHelper) - APIdock

I added favicon_link_tag ‘favicon.ico’ inside the head as follows:

app/views/layouts/application.html.haml

!!!
%html
  %head
    %meta{:content => "text/html; charset=UTF-8", "http-equiv" => "Content-Type"}/
    %title YourSite
    = csrf_meta_tags
    = stylesheet_link_tag    'application', media: 'all', 'data-turbolinks-track': 'reload'
    = javascript_include_tag 'application', 'data-turbolinks-track': 'reload'
    = favicon_link_tag 'favicon.ico'
  %body
    = yield

Also, I saved the favicon file as favicon.ico directly under app/assets/images/.

You can also use favicon_link_tag by omitting the first argument, but explicitly writing ‘favicon.ico’ seems useful for grep searches later, so I configured it this way.

That’s all from the Gemba where I set favicon.ico using Ruby on Rails’ favicon_link_tag helper method.