Add per-node translation management: list, edit, destroy, compare

Replaces the old locale-switch-and-edit-the-same-screen workflow,
which conflated presentation locale with content locale and let an
editor silently drift into editing the wrong language with no
persistent signal that anything had changed. Non-default-locale
content now has its own explicit routes and screens, never sharing
a route param with the ambient chrome locale.

- PageTranslationsController: index/show/edit/update/destroy,
  scoped to Page.non_default_locales; update handles first-time
  creation too, so there's no separate new/create step.
- Reads go through the actual PageTranslation row
  (Page#translation_summary), never through the Globalize
  fallback-bearing accessor -- fallback is correct for public
  rendering but wrong for editing, where a missing translation
  needs to look empty, not borrowed from another locale.
- Translations ride on the page's own draft/head cycle; no
  independent publish state.
- nodes#show gains a Translations section (per-locale Lock+Edit /
  Create+Lock, Destroy, a link into the read-only Compare view) and
  a locale indicator on its own default-locale content; nodes#edit,
  nodes#update, and nodes#autosave are pinned to the default locale
  via Globalize.with_locale regardless of the ambient route locale.
- nodes#show no longer double-loads the node or calls wipe_draft!
  on every view (see previous commit for why that's now safe).
- .preview_link_row is renamed .aligned_action_row now that it has
  a second real consumer.

1 files changed, 78 insertions, 0 deletions

diff --git a/test/controllers/page_translations_controller_test.rb b/test/controllers/page_translations_controller_test.rb
new file mode 100644
index 0000000..d84ac45
--- /dev/null
+++ b/test/controllers/page_translations_controller_test.rb
@@ -0,0 +1,78 @@
+require 'test_helper'
+
+class PageTranslationsControllerTest < ActionController::TestCase
+  test "index lists the default locale's existing translation and flags a missing one" do
+    login_as :quentin
+    node = Node.root.children.create!(:slug => "translations_index_test")
+    node.publish_draft!
+
+    get :index, params: { :node_id => node.id }
+
+    assert_response :success
+    assert_equal [:en], assigns(:translations).map { |t| t[:locale] }
+    assert_equal false, assigns(:translations).first[:exists]
+  end
+
+  test "update creates a first-time translation on a fresh draft, leaving head untouched" do
+    login_as :quentin
+    node = Node.root.children.create!(:slug => "translations_create_test")
+    Globalize.with_locale(:de) { node.draft.update!(:title => "Deutscher Titel") }
+    node.publish_draft!
+
+    patch :update, params: { :node_id => node.id, :translation_locale => "en", :page => { :title => "English Title" } }
+
+    node.reload
+    assert_not_nil node.draft
+    assert_includes node.draft.translated_locales, :en
+    assert_not_includes node.head.translated_locales, :en
+  end
+
+  test "no route exists for the default locale under the translations resource" do
+    login_as :quentin
+    node = Node.root.children.create!(:slug => "translations_route_constraint_test")
+
+    assert_raises(ActionController::UrlGenerationError) do
+      patch :update, params: { :node_id => node.id, :translation_locale => "de", :page => { :title => "x" } }
+    end
+  end
+
+  test "update with Save + Unlock + Exit unlocks the node and redirects to nodes#show" do
+    login_as :quentin
+    node = Node.root.children.create!(:slug => "translations_exit_test")
+
+    patch :update, params: { :node_id => node.id, :translation_locale => "en", :page => { :title => "x" }, :commit => "Save + Unlock + Exit" }
+
+    assert_nil node.reload.lock_owner
+    assert_redirected_to node_path(node)
+  end
+
+  test "update saves the translation onto the draft" do
+    login_as :quentin
+    node = Node.root.children.create!(:slug => "translations_update_test")
+    Globalize.with_locale(:en) { node.draft.update!(:title => "Original") }
+
+    patch :update, params: { :node_id => node.id, :translation_locale => "en", :page => { :title => "Revised" } }
+
+    assert_equal "Revised", Globalize.with_locale(:en) { node.draft.reload.title }
+  end
+
+  test "destroy refuses to remove the only remaining translation" do
+    login_as :quentin
+    node = Node.root.children.create!(:slug => "translations_destroy_last_test")
+    Globalize.with_locale(:en) { node.draft.update!(:title => "Only translation") }
+    node.draft.translations.where(:locale => :de).delete_all
+
+    delete :destroy, params: { :node_id => node.id, :translation_locale => "en" }
+
+    assert_equal "Can't remove the only remaining translation.", flash[:error]
+  end
+
+  test "destroy is a safe no-op, not a false success, when the translation doesn't exist" do
+    login_as :quentin
+    node = Node.root.children.create!(:slug => "translations_destroy_missing_test")
+
+    delete :destroy, params: { :node_id => node.id, :translation_locale => "en" }
+
+    assert_match(/No EN translation exists/, flash[:error])
+  end
+end