Rails create custom function/method and where to store

On my article index page I have a condition to display the number of articles, the grammar in the word 'article' changes based on the number. This works as current. As below:

view/article/index.html.erb

<h1>All Article Page</h1>

<% if Article.count == 1%>
This blog has <%= Article.public_count %> article so far!
<% elsif Article.count >= 2 %>
This blog has <%= Article.public_count %> articles so far!
<% else %>
<%= Article.public_count %> articles, so lonely :(
<% end %>

How would I create a custom method or function to apply the above without having to write it all out repeatedly on different views in the future, adhering to DRY. I am aware of partials but want to know whether there is a more rails-like way to do this considering its a highly opinionated system.

After research its not clear whether it should go in my Article model, config/initializer or in my app/controller.

As an example the method would be something like the below, saved within a file called 'article_count.rb'. Then called within the index view, however nothing happens:

def display_article_count_string
  if Article.count == 1
    p "This blog has #{Article.public_count} article so far!"
  elsif Article.count >= 2
    p "This blog has #{Article.public_count} articles so far!"
  else
    p "0 articles, so lonely :("
  end
end

For simple and not to complex logic, view logic can go into the app/helpers of your Rails project.

For your articles controller, helper file will live at app/helpers/articles_helper.rb

module ArticlesHelper

  def display_article_count_string
    if Article.count == 1
      p "This blog has #{Article.public_count} article so far!"
    elsif Article.count >= 2
      p "This blog has #{Article.public_count} articles so far!"
    else
      p "0 articles, so lonely :("
    end
  end

end

For more common stuff you want to share across different views, app/helpers/application_helper.rb is another place.

Tip:
Another useful Rails view helper is the pluralize(1, 'article') method. It can help provide singular/plural form of your resource name More Info

My tips for your case

view/article/index.html.erb

  <h1>All Article Page</h1>
  <%= Article.info_count %>

• Article.info_count will call class method inside Article
• this is the reason inside article.rb you have to add self as class method (see below)

inside app/model/article.rb

  def self.info_count 
    if Article.count.zero? 
      "so lonely :("
    else
      "this blog has #{Article.count} article so far!
    end
  end