Hi guys,
Today we are going to discuss about auto_discovery_link_tag in rails. It comes under AssetTagHelper, which gives methods for generating HTML that links views to assets(i.e images, JavaScripts, stylesheets, and feeds).
For consuming RSS and Atom Feeds auto_discovery_link_tag is used. By using this it returns a link tag that is used by the browser and feed readers to auto-detect RSS or atom feed. Its syntax is:

auto_discovery_link_tag(type = :rss, url_options = {}, tag_options = {}) public

The options given here are:

• type: - It can be :rss or :atom. By default it is :rss.
• url_options: - For controlling the link options in url_for format.
• tag_options: - It is used for modifying the link_tag. Its available options are:
  
  • :rel - By default it's alternate, and is used to specify the relation of the link.
  • :type -It is used to override the auto-generated mime type.
  • :title - It specifies the title of the link.

Example:

auto_discovery_link_tag(:rss, "http://www.findnerd.com/blogs.rss", { title: "FindNerd" }) 
# =>
<link rel="alternate" type="application/rss+xml" title="FindNerd" href="http://www.findnerd.com/blogs.rss" />

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