FIX: Broken group messages inboxes when group name is mixed case

This is a follow up to 1cbc65b where
visiting a group with a mixed case name would result in an error.

app/assets/javascripts/discourse/app/controllers/user-private-messages.js

@@ -46,7 +46,11 @@ export default class extends Controller {
     for (let i = this.messagesDropdownContent.length - 1; i >= 0; i--) {
       const row = this.messagesDropdownContent[i];
 
-      if (currentURL.includes(row.id.replace(this.router.rootURL, "/"))) {
+      if (
+        currentURL.includes(
+          row.id.toLowerCase().replace(this.router.rootURL, "/")
+        )
+      ) {
         value = row.id;
         break;
       }

app/assets/javascripts/discourse/app/routes/user-private-messages-group.js

@@ -4,7 +4,16 @@ export default class extends DiscourseRoute {
   model(params) {
     return this.modelFor("user")
       .get("groups")
-      .filterBy("name", params.name.toLowerCase())[0];
+      .find((group) => {
+        return group.name.toLowerCase() === params.name.toLowerCase();
+      });
+  }
+
+  afterModel(model) {
+    if (!model) {
+      this.transitionTo("exception-unknown");
+      return;
+    }
   }
 
   setupController(controller, model) {

app/assets/javascripts/discourse/tests/acceptance/user-private-messages-test.js

@@ -19,7 +19,6 @@ import {
 } from "discourse/lib/topic-list-tracker";
 import { withPluginApi } from "discourse/lib/plugin-api";
 import { resetCustomUserNavMessagesDropdownRows } from "discourse/controllers/user-private-messages";
-import userFixtures from "discourse/tests/fixtures/user-fixtures";
 
 acceptance(
   "User Private Messages - user with no group messages",
@@ -971,52 +970,3 @@ acceptance(
     });
   }
 );
-
-acceptance(
-  "User Private Messages - user with uppercase username",
-  function (needs) {
-    needs.user({
-      groups: [{ id: 14, name: "awesome_group", has_messages: true }],
-    });
-
-    needs.pretender((server, helper) => {
-      const response = cloneJSON(userFixtures["/u/charlie.json"]);
-      response.user.username = "chArLIe";
-      server.get("/u/charlie.json", () => helper.response(response));
-
-      server.get(
-        "/topics/private-messages-group/:username/:group_name.json",
-        () => {
-          return helper.response({
-            topic_list: {
-              topics: [
-                { id: 1, posters: [] },
-                { id: 2, posters: [] },
-              ],
-            },
-          });
-        }
-      );
-    });
-
-    test("viewing inbox", async function (assert) {
-      await visit("/u/charlie/messages");
-
-      assert.strictEqual(
-        query(".user-nav-messages-dropdown .selected-name").textContent.trim(),
-        "Inbox",
-        "menu defaults to Inbox"
-      );
-    });
-
-    test("viewing group inbox", async function (assert) {
-      await visit("/u/charlie/messages/group/awesome_group");
-
-      assert.strictEqual(
-        query(".user-nav-messages-dropdown .selected-name").textContent.trim(),
-        "awesome_group",
-        "dropdown menu displays the right group name"
-      );
-    });
-  }
-);

spec/system/page_objects/pages/user_private_messages.rb

@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+module PageObjects
+  module Pages
+    class UserPrivateMessages < PageObjects::Pages::Base
+      def visit(user)
+        page.visit "/u/#{user.username}/messages"
+        self
+      end
+
+      def visit_group_inbox(user, group)
+        page.visit "/u/#{user.username}/messages/group/#{group.name}"
+        self
+      end
+
+      def has_right_inbox_dropdown_value?(value)
+        has_css?(".user-nav-messages-dropdown .combo-box-header[data-name='#{value}']")
+      end
+    end
+  end
+end

spec/system/viewing_user_private_messages_spec.rb

@@ -0,0 +1,30 @@
+# frozen_string_literal: true
+
+describe "Viewing user private messages", type: :system do
+  fab!(:user) { Fabricate(:user, username: "mIxed_caSE_usERNAME") }
+  fab!(:user2) { Fabricate(:user) }
+
+  let(:user_private_messages_page) { PageObjects::Pages::UserPrivateMessages.new }
+
+  before { sign_in(user) }
+
+  describe "when the user has group messages" do
+    fab!(:group) do
+      Fabricate(:group, name: "miXeD_caSE_name", has_messages: true).tap { |g| g.add(user) }
+    end
+
+    before { SiteSetting.personal_message_enabled_groups = Group::AUTO_GROUPS[:everyone] }
+
+    it "allows the user to view the default messages inbox" do
+      user_private_messages_page.visit(user)
+
+      expect(user_private_messages_page).to have_right_inbox_dropdown_value("Inbox")
+    end
+
+    it "allows the user to view the group messages inbox of a group" do
+      user_private_messages_page.visit_group_inbox(user, group)
+
+      expect(user_private_messages_page).to have_right_inbox_dropdown_value("miXeD_caSE_name")
+    end
+  end
+end