Only allow HTTP(S) URLs in example app

spec/example_app/app/models/product.rb

@@ -11,8 +11,10 @@ def self.policy_class
   has_many :pages, dependent: :destroy
   has_one :product_meta_tag, dependent: :destroy
 
+  before_validation :trim_image_url
+
   validates :description, presence: true
-  validates :image_url, presence: true
+  validates :image_url, presence: true, format: %r{\Ahttps?://}
   validates :name, presence: true
   validates :price, presence: true
   validates :release_year,
@@ -40,4 +42,10 @@ def valid_slug
       errors.add :name, "must have letters or numbers for the URL"
     end
   end
+
+  private
+
+  def trim_image_url
+    image_url&.strip!
+  end
 end

spec/example_app/spec/models/product_spec.rb

@@ -0,0 +1,19 @@
+require "rails_helper"
+
+RSpec.describe Product do
+  describe "validations" do
+    it { should allow_value("http://example.com/foo/bar").for(:image_url) }
+    it { should allow_value("https://example.com/foo/bar").for(:image_url) }
+    it { should_not allow_value("ftp://example.com/foo/bar").for(:image_url) }
+  end
+
+  describe "#image_url" do
+    it "is trimmed on save" do
+      product = FactoryBot.create(
+        :product,
+        image_url: "\n https://example.com/foo/bar  \n",
+      )
+      expect(product.image_url).to eq("https://example.com/foo/bar")
+    end
+  end
+end