Fixes for home nav link positioning (#16381)

* Add new DUS to fix home nav link positioning

* fix bug in local db seeding

lib/data_update_scripts/20220201114309_update_home_navigation_link_position.rb

@@ -0,0 +1,14 @@
+module DataUpdateScripts
+  class UpdateHomeNavigationLinkPosition
+    def run
+      NavigationLink.create_or_update_by_identity(
+        name: "Home",
+        url: URL.url("/"),
+        icon: File.read(Rails.root.join("app/assets/images/twemoji/house.svg")),
+        display_only_when_signed_in: false,
+        position: 1,
+        section: :default,
+      )
+    end
+  end
+end

lib/tasks/add_navigation_links.rake

@@ -128,6 +128,7 @@ namespace :navigation_links do
     base_url = "#{protocol}#{domain}".freeze
 
     NavigationLink.create_or_update_by_identity(
+      url: "/",
       name: "Home",
       icon: home_icon,
       display_only_when_signed_in: false,

spec/lib/data_update_scripts/update_home_navigation_link_position_spec.rb

@@ -0,0 +1,18 @@
+require "rails_helper"
+require Rails.root.join(
+  "lib/data_update_scripts/20220201114309_update_home_navigation_link_position.rb",
+)
+
+describe DataUpdateScripts::UpdateHomeNavigationLinkPosition do
+  it "creates a home navigation link when it doesn't already exist" do
+    expect do
+      described_class.new.run
+    end.to change { NavigationLink.exists?(url: "/", name: "Home", position: 1) }.from(false).to(true)
+  end
+
+  it "updates any existing home navigation link to have position 1" do
+    link = create(:navigation_link, url: "/", name: "Home", position: 4)
+    described_class.new.run
+    expect(link.reload.position).to eq(1)
+  end
+end