Sharing your product on social networks has become one privileged way to grow your userbase. But before you unleash your sharing fury, make sure your social meta tags are properly set.

WTF are meta tags?

<meta> tags are HTML tags in the <head> of a webpage, visible to anyone.

Lewagon Demoday Metatags

They provide the content displayed on social networks whenever your product's url is shared in a post. Titles, descriptions and images should all be setup with care and consideration to improve your social exposure's conversion rate. The right content, including optimized images have shown to help posts to spread, even leading to increased shares and mentions, improving natural SEO.

For instance:

Setup in a Rails app

In this tutorial, we'll see:

  • how to simply setup default meta tags for any of your website's pages,
  • how to override them in some pages to be more specific and impactful.

Default Meta Tags

Let's create a meta.yml file in config, with the following:

# config/meta.yml

meta_product_name: "Product Name"
meta_title: "Product name - Product tagline"
meta_description: "Relevant description"
meta_image: "cover.png"                       # should exist in `app/assets/images/`
twitter_account: "@product_twitter_account"   # required for Twitter Cards

Let's create a default_meta.rb file in config/initializers in which we load the content as a Hash in a DEFAULT_META Ruby constant.

# config/initializers/default_meta.rb

# Initialize default meta tags.
DEFAULT_META = YAML.load_file(Rails.root.join("config/meta.yml"))

Important: as any file in the config/initializers folder, it is loaded when your app is launched. Any time you change the content in meta.yml, restart your rails s to refresh DEFAULT_META!

Helpers setup

Now before setting up our meta tags in our views, let's setup helpers that will encapsulate the following logic for our 3 keys :meta_title, :meta_description and :meta_image:

In any view, if a content_for(:meta_key) was defined, it should override DEFAULT_META's value.

Let's create a new app/helpers/meta_tags_helper.rb file with the following:

# app/helpers/meta_tags_helper.rb

module MetaTagsHelper
  def meta_title
    content_for?(:meta_title) ? content_for(:meta_title) : DEFAULT_META["meta_title"]
  end

  def meta_description
    content_for?(:meta_description) ? content_for(:meta_description) : DEFAULT_META["meta_description"]
  end

  def meta_image
    meta_image = (content_for?(:meta_image) ? content_for(:meta_image) : DEFAULT_META["meta_image"])
    # little twist to make it work equally with an asset or a url
    meta_image.starts_with?("http") ? meta_image : image_url(meta_image)
  end
end

Important: production host setup for images absolute urls

Rails image_url helper requires you setup your host to generate the absolute url needed to load your images from the external world (Facebook, Twitter, ...).

Let's override Rails.application.default_url_options[:host] by adding the following in app/controllers/application_controller.rb:

# app/controllers/application_controller.rb

def default_url_options
  { host: ENV["HOST"] || "localhost:3000" }
end

Make sure your production HOST variable is set with your domain name. If you deploy your code with Heroku for instance, just type in your terminal heroku config:set HOST=www.my_product.com

You can check it's properly set with heroku config:get HOST.

HTML setup - Layout

Finally, open your layout app/views/layouts/application.html.erb and copy paste the following meta tags in your layout's <head>:

<title><%= meta_title %></title>
<meta name="description" content="<%= meta_description %>">

<!-- Facebook Open Graph data -->
<meta property="og:title" content="<%= meta_title %>" />
<meta property="og:type" content="website" />
<meta property="og:url" content="<%= request.original_url %>" />
<meta property="og:image" content="<%= meta_image %>" />
<meta property="og:description" content="<%= meta_description %>" />
<meta property="og:site_name" content="<%= meta_title %>" />

<!-- Twitter Card data -->
<meta name="twitter:card" content="summary_large_image">
<meta name="twitter:site" content="<%= DEFAULT_META["twitter_account"] %>">
<meta name="twitter:title" content="<%= meta_title %>">
<meta name="twitter:description" content="<%= meta_description %>">
<meta name="twitter:creator" content="<%= DEFAULT_META["twitter_account"] %>">
<meta name="twitter:image:src" content="<%= meta_image %>">

HTML setup - Views

Now let's assume you have an Offer model and you want dynamic titles and descriptions for any products#show page. Just set the relevant content_fors in app/views/offers/show.html.erb:

<!-- app/views/offers/show.html.erb -->
<% content_for :meta_title, "#{@offer.name} is on #{DEFAULT_META["meta_product_name"]}" %>
<% content_for :meta_description, @offer.description %>
<% content_for :meta_image, cl_image_path(@offer.photo.path) %>

Testing

It's time to deploy your code and test your setup.

Social Networks provide debugging tools to help you check your tags are properly set.

Important : Facebook's Open Graph recommends 1200x630 dimensions for meta images. Read the documentation if you cannot manage to clear out all their warnings!

That's all folks

This sets a framework to easily manage your meta tags in every single page of your website. It's now up to you to keep on setting relevant titles, descriptions and images every time you code a new view!

Airbnb Metatags

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Edward Schults Teacher & Developer at Le Wagon

Edward and Le Wagon is a long love story. Former student of Batch #4, teaching assistant during one year, he is now an official teacher and fullstack developer at Le Wagon. Oh, and Edward also founded Lovely Hood.