Complete Lesson 19

app/controllers/movies_controller.rb

@@ -10,16 +10,22 @@ class MoviesController < ApplicationController
     end
     def update
       @movie = Movie.find(params[:id])
-      @movie.update(movie_params)
-      redirect_to @movie
+      if @movie.update(movie_params)
+        redirect_to @movie
+      else
+        render :edit, status: :unprocessable_entity
+      end
     end
     def new
       @movie = Movie.new
     end
     def create
       @movie = Movie.new(movie_params)
-      @movie.save
-      redirect_to @movie
+      if @movie.save
+        redirect_to @movie
+      else
+        render :new, status: :unprocessable_entity
+      end
     end
     def destroy
       @movie = Movie.find(params[:id])

app/views/movies/_form.html.erb

@@ -1,4 +1,6 @@
 <%= form_with(model: movie) do |f| %>
+  <%= render "shared/errors", object: movie %>
+
   <%= f.label :title %>
   <%= f.text_field :title, autofocus: true %>
 

app/views/shared/_errors.html.erb

@@ -0,0 +1,16 @@
+<% if object.errors.any? %>
+  <section class="errors">
+    <h2>
+      Oops! Your form could not be saved.
+    </h2>
+    <h3>
+      Please correct the following
+      <%= pluralize(object.errors.size, "error") %>:
+    </h3>
+    <ul>
+      <% object.errors.full_messages.each do |message| %>
+        <li><%= message %></li>
+      <% end %>
+    </ul>
+  </section>
+<% end %>