Introduce untenanted Identity and Membership models

The new integration test shows the desired user-facing behavior, which
is to make it easy to login without a tenanted URL and to jump between
tenants.

Note that we track two things in the identity_token cookie: a signed
id, and the updated_at for the underlying Identity object. This allows
us to effectively cache on the Identity without having to hit the
database, by using an Identity::Mock object that is compatible with
etag and cache methods.

app/controllers/concerns/authentication.rb

@@ -86,13 +86,12 @@ module Authentication
 
     def link_identity(user)
       token_value = cookies.signed[:identity_token]
-      token_identity = Identity.find_signed(token_value["id"]) if token_value.present?
-      identity = user.set_identity(token_identity)
+      identity = Identity.find_signed(token_value["id"]) if token_value.present?
+      identity = user.set_identity(identity)
       cookies.signed.permanent[:identity_token] = { value: { "id" => identity.signed_id, "updated_at" => identity.updated_at }, httponly: true, same_site: :lax }
     end
 
     def set_current_identity_token
-      link_identity(Current.user) if cookies.signed[:identity_token].nil? && Current.user.present?
       Current.identity_token = Identity::Mock.new(**cookies.signed[:identity_token])
     end
 

app/views/my/menus/_places.html.erb

@@ -5,6 +5,12 @@
   <%= filter_place_menu_item notifications_path, "Notifications", "bell" %>
   <%= filter_place_menu_item notifications_settings_path, "Notification Settings", "settings" %>
 
+  <% cache [ Current.user, Current.identity_token ] do %>
+    <% Current.user.identity.memberships.where.not(user_tenant: Current.user.tenant).each do |membership| %>
+      <%= filter_place_menu_item root_url(script_name: "/#{membership.user_tenant}"), "#{membership.account_name}", "logo-color", new_window: true %>
+    <% end %>
+  <% end %>
+
   <%= tag.li class: "popup__item", data: { filter_target: "item", navigable_list_target: "item" } do %>
     <%= icon_tag "logout", class: "popup__icon" %>
     <%= button_to session_path, method: :delete, class: "popup__btn btn", data: { turbo: false } do %>

app/views/sessions/login_menu.html.erb

@@ -3,6 +3,7 @@
 <div class="panel shadow center margin-block-double" style="--panel-size: 55ch;">
   <h1 class="txt-xx-large margin-block-end-double">BOXCAR</h1>
 
+<% cache [ Current.user, Current.identity_token ] do %>
   <% identity = Identity.find_signed(Current.identity_token.id) %>
   <% memberships = identity&.memberships %>
   <% if memberships.present? %>
@@ -10,11 +11,11 @@
     <ul class="flex flex-column gap txt-large" style="list-style-type: none; padding: 0;">
       <% memberships.each do |membership| %>
         <li>
-          <%= link_to membership.account_name, root_url(script_name: "/#{membership.user_tenant}"), class: "btn btn--reversed center" %>
+          <%= link_to membership.account_name, root_url(script_name: "/#{membership.user_tenant}") %>: <%= membership.email_address %>
         </li>
       <% end %>
     </ul>
   <% else %>
     <p class="txt-large txt-align-center txt-subtle">You don't have any existing BOXCAR accounts.</p>
   <% end %>
-</div>
+<% end %>

test/integration/identity_membership_test.rb

@@ -24,14 +24,14 @@ class IdentityMembershipTest < ActionDispatch::IntegrationTest
 
     # Render links for other Fizzies in the jump menu
     get my_menu_path(script_name: @tenant_paths[0])
-    assert_select "#my_menu ul li a[href='#{@tenant_urls[1]}']", "Account for #{@tenants[1]}"
+    assert_select "#my_menu ul li a[href='#{@tenant_urls[1]}']", "Account for #{@tenants[1]}: user@example.com"
 
     get my_menu_path(script_name: @tenant_paths[1])
-    assert_select "#my_menu ul li a[href='#{@tenant_urls[0]}']", "Account for #{@tenants[0]}"
+    assert_select "#my_menu ul li a[href='#{@tenant_urls[0]}']", "Account for #{@tenants[0]}: user@example.com"
 
     # Render links for all the identity's Fizzies
     get root_path(script_name: nil)
-    assert_select "ul li a[href='#{@tenant_urls[0]}']", "Account for #{@tenants[0]}"
-    assert_select "ul li a[href='#{@tenant_urls[1]}']", "Account for #{@tenants[1]}"
+    assert_select "ul li a[href='#{@tenant_urls[0]}']", "Account for #{@tenants[0]}: user@example.com"
+    assert_select "ul li a[href='#{@tenant_urls[1]}']", "Account for #{@tenants[1]}: user@example.com"
   end
 end