Article validations were added

app/controllers/articles_controller.rb

@@ -16,9 +16,12 @@ def create
 
     @article = Article.new(article_params)
 
-    @article.save
+    if @article.save
+      redirect_to @article
+    else
+      render 'new'
+    end
 
-    redirect_to @article
 
   end
 

app/models/article.rb

@@ -1,2 +1,4 @@
 class Article < ActiveRecord::Base
+  validates :title, presence: true,
+            length: { minimum: 5 }
 end

app/views/articles/new.html.erb

@@ -1,6 +1,19 @@
 <h1>New Article</h1>
 
 <%= form_for :article, url: articles_path do |f| %>
+
+    <% if @article.errors.any? %>
+        <div id="error_explanation">
+          <h2><%= pluralize(@article.errors.count, "error") %> prohibited
+            this article from being saved:</h2>
+          <ul>
+            <% @article.errors.full_messages.each do |msg| %>
+                <li><%= msg %></li>
+            <% end %>
+          </ul>
+        </div>
+    <% end %>
+
     <p>
       <%= f.label :title %><br>
       <%= f.text_field :title %>