Include invalid directories in wiki title message

Since the directory names can get very long and break the layout if they
don't contain spaces, we tweak the `form_errors` helper to optionally
truncate some error messages.

app/helpers/form_helper.rb

@@ -3,18 +3,23 @@
 module FormHelper
   prepend_if_ee('::EE::FormHelper') # rubocop: disable Cop/InjectEnterpriseEditionModule
 
-  def form_errors(model, type: 'form')
+  def form_errors(model, type: 'form', truncate: [])
     return unless model.errors.any?
 
     headline = n_('The %{type} contains the following error:', 'The %{type} contains the following errors:', model.errors.count) % { type: type }
+    truncate = Array.wrap(truncate)
 
     content_tag(:div, class: 'alert alert-danger', id: 'error_explanation') do
       content_tag(:h4, headline) <<
         content_tag(:ul) do
-          model.errors.full_messages
-            .map { |msg| content_tag(:li, msg) }
-            .join
-            .html_safe
+          messages = model.errors.map do |attribute, message|
+            message = model.errors.full_message(attribute, message)
+            message = content_tag(:span, message, class: 'str-truncated-100') if truncate.include?(attribute)
+
+            content_tag(:li, message)
+          end
+
+          messages.join.html_safe
         end
     end
   end

app/models/wiki_page.rb

@@ -333,11 +333,15 @@ class WikiPage
     *dirnames, title = @attributes[:title].split('/')
 
     if title.bytesize > MAX_TITLE_BYTES
-      errors.add(:title, _("exceeds the limit of %{bytes} bytes for page titles") % { bytes: MAX_TITLE_BYTES })
+      errors.add(:title, _("exceeds the limit of %{bytes} bytes") % { bytes: MAX_TITLE_BYTES })
     end
 
-    if dirnames.any? { |d| d.bytesize > MAX_DIRECTORY_BYTES }
-      errors.add(:title, _("exceeds the limit of %{bytes} bytes for directory names") % { bytes: MAX_DIRECTORY_BYTES })
+    invalid_dirnames = dirnames.select { |d| d.bytesize > MAX_DIRECTORY_BYTES }
+    invalid_dirnames.each do |dirname|
+      errors.add(:title, _('exceeds the limit of %{bytes} bytes for directory name "%{dirname}"') % {
+        bytes: MAX_DIRECTORY_BYTES,
+        dirname: dirname
+      })
     end
   end
 end

app/views/projects/wikis/_form.html.haml

@@ -4,7 +4,7 @@
 = form_for [@project.namespace.becomes(Namespace), @project, @page], method: @page.persisted? ? :put : :post,
            html: { class: form_classes },
            data: { uploads_path: uploads_path } do |f|
-  = form_errors(@page)
+  = form_errors(@page, truncate: :title)
 
   - if @page.persisted?
     = f.hidden_field :last_commit_sha, value: @page.last_commit_sha

changelogs/unreleased/tweak-wiki-title-validation-message.yml

+---
+title: Include invalid directories in wiki title message
+merge_request: 25376
+author:
+type: changed

locale/gitlab.pot

@@ -23227,10 +23227,10 @@ msgstr ""
 msgid "estimateCommand|%{slash_command} will update the estimated time with the latest command."
 msgstr ""
 
-msgid "exceeds the limit of %{bytes} bytes for directory names"
+msgid "exceeds the limit of %{bytes} bytes"
 msgstr ""
 
-msgid "exceeds the limit of %{bytes} bytes for page titles"
+msgid "exceeds the limit of %{bytes} bytes for directory name \"%{dirname}\""
 msgstr ""
 
 msgid "expired on %{milestone_due_date}"

spec/helpers/form_helper_spec.rb

@@ -39,6 +39,25 @@ describe FormHelper do
       end
     end
 
+    it 'renders messages truncated if requested' do
+      model = double(errors: errors_stub('Error 1', 'Error 2'))
+      model.errors.add(:title, 'is truncated')
+      model.errors.add(:base, 'Error 3')
+
+      expect(model.class).to receive(:human_attribute_name) do |attribute|
+        attribute.to_s.capitalize
+      end
+
+      errors = helper.form_errors(model, truncate: :title)
+
+      aggregate_failures do
+        expect(errors).to include('<li>Error 1</li>')
+        expect(errors).to include('<li>Error 2</li>')
+        expect(errors).to include('<li><span class="str-truncated-100">Title is truncated</span></li>')
+        expect(errors).to include('<li>Error 3</li>')
+      end
+    end
+
     def errors_stub(*messages)
       ActiveModel::Errors.new(double).tap do |errors|
         messages.each { |msg| errors.add(:base, msg) }

spec/models/wiki_page_spec.rb

@@ -192,16 +192,17 @@ describe WikiPage do
 
           expect(subject).not_to be_valid
           expect(subject.errors[:title]).to contain_exactly(
-            "exceeds the limit of #{max_title} bytes for page titles"
+            "exceeds the limit of #{max_title} bytes"
           )
         end
 
         it 'rejects directories exceeding the limit' do
-          subject.title = invalid_directory + '/foo'
+          subject.title = "#{invalid_directory}/#{invalid_directory}2/foo"
 
           expect(subject).not_to be_valid
           expect(subject.errors[:title]).to contain_exactly(
-            "exceeds the limit of #{max_directory} bytes for directory names"
+            "exceeds the limit of #{max_directory} bytes for directory name \"#{invalid_directory}\"",
+            "exceeds the limit of #{max_directory} bytes for directory name \"#{invalid_directory}2\""
           )
         end
 
@@ -210,8 +211,8 @@ describe WikiPage do
 
           expect(subject).not_to be_valid
           expect(subject.errors[:title]).to contain_exactly(
-            "exceeds the limit of #{max_title} bytes for page titles",
-            "exceeds the limit of #{max_directory} bytes for directory names"
+            "exceeds the limit of #{max_title} bytes",
+            "exceeds the limit of #{max_directory} bytes for directory name \"#{invalid_directory}\""
           )
         end
       end