Fix adding a rich_text_area to a form with no model

.gitignore

@@ -1,4 +1,5 @@
 .bundle/
+.byebug_history
 log/*.log
 node_modules/
 pkg/

Gemfile.lock

@@ -73,6 +73,7 @@ GEM
   remote: https://rubygems.org/
   specs:
     builder (3.2.3)
+    byebug (10.0.2)
     concurrent-ruby (1.0.5)
     crass (1.0.4)
     erubi (1.7.1)
@@ -133,6 +134,7 @@ PLATFORMS
 DEPENDENCIES
   actiontext!
   bundler (~> 1.15)
+  byebug
   mini_magick
   rails!
   sqlite3

actiontext.gemspec

@@ -22,6 +22,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency "mini_magick"
   s.add_development_dependency "sqlite3"
   s.add_development_dependency "webpacker", "~> 3.2.2"
+  s.add_development_dependency "byebug"
 
   s.files      = `git ls-files`.split("\n")
   s.test_files = `git ls-files -- test/*`.split("\n")

app/helpers/action_text/tag_helper.rb

@@ -40,7 +40,7 @@ module ActionView::Helpers
     def render
       options = @options.stringify_keys
       add_default_name_and_id(options)
-      options["input"] ||= dom_id(object, [options["id"], :trix_input].compact.join("_"))
+      options["input"] ||= dom_id(object, [options["id"], :trix_input].compact.join("_")) if object
       @template_object.rich_text_area_tag(options.delete("name"), editable_value, options)
     end
 

test/template/form_helper_test.rb

@@ -5,45 +5,67 @@ require 'test_helper'
 class ActionText::FormHelperTest < ActionView::TestCase
   tests ActionText::TagHelper
 
+  test "form with rich text area" do
+    form_with model: Message.new, scope: :message do |form|
+      form.rich_text_area :content
+    end
+
+    assert_dom_equal \
+      '<form action="/messages" accept-charset="UTF-8" data-remote="true" method="post">' \
+        '<input name="utf8" type="hidden" value="&#x2713;" />' \
+        '<input type="hidden" name="message[content]" id="message_content_trix_input_message" />' \
+        '<trix-editor id="message_content" input="message_content_trix_input_message" class="trix-content" data-direct-upload-url="http://test.host/rails/active_storage/direct_uploads" data-blob-url-template="http://test.host/rails/active_storage/blobs/:signed_id/:filename">' \
+        '</trix-editor>' \
+      '</form>',
+      output_buffer
+  end
+
+  test "form with rich text area having class" do
+    form_with model: Message.new, scope: :message do |form|
+      form.rich_text_area :content, class: "custom-class"
+    end
+
+    assert_dom_equal \
+      '<form action="/messages" accept-charset="UTF-8" data-remote="true" method="post">' \
+        '<input name="utf8" type="hidden" value="&#x2713;" />' \
+        '<input type="hidden" name="message[content]" id="message_content_trix_input_message" />' \
+        '<trix-editor id="message_content" input="message_content_trix_input_message" class="custom-class" data-direct-upload-url="http://test.host/rails/active_storage/direct_uploads" data-blob-url-template="http://test.host/rails/active_storage/blobs/:signed_id/:filename">' \
+        '</trix-editor>' \
+      '</form>',
+      output_buffer
+  end
+
+  test "form with rich text area for non-attribute" do
+    form_with model: Message.new, scope: :message do |form|
+      form.rich_text_area :not_an_attribute
+    end
+
+    assert_dom_equal \
+      '<form action="/messages" accept-charset="UTF-8" data-remote="true" method="post">' \
+        '<input name="utf8" type="hidden" value="&#x2713;" />' \
+        '<input type="hidden" name="message[not_an_attribute]" id="message_not_an_attribute_trix_input_message" />' \
+        '<trix-editor id="message_not_an_attribute" input="message_not_an_attribute_trix_input_message" class="trix-content" data-direct-upload-url="http://test.host/rails/active_storage/direct_uploads" data-blob-url-template="http://test.host/rails/active_storage/blobs/:signed_id/:filename">' \
+        '</trix-editor>' \
+      '</form>',
+      output_buffer
+  end
+
+  test "modelless form with rich text area" do
+    form_with url: "/messages", scope: :message do |form|
+      form.rich_text_area :content
+    end
+
+    assert_dom_equal \
+      '<form action="/messages" accept-charset="UTF-8" data-remote="true" method="post">' \
+        '<input name="utf8" type="hidden" value="&#x2713;" />' \
+        '<input type="hidden" name="message[content]" id="trix_input_1" />' \
+        '<trix-editor id="message_content" input="trix_input_1" class="trix-content" data-direct-upload-url="http://test.host/rails/active_storage/direct_uploads" data-blob-url-template="http://test.host/rails/active_storage/blobs/:signed_id/:filename">' \
+        '</trix-editor>' \
+      '</form>',
+      output_buffer
+  end
+
   def form_with(*)
     @output_buffer = super
   end
-
-  test "rich_text_area doesn't raise when attributes don't exist in the model" do
-    assert_nothing_raised do
-      form_with(model: Message.new, scope: :message, id: "create-message") do |form|
-        form.rich_text_area(:not_an_attribute)
-      end
-    end
-
-    assert_match "message[not_an_attribute]", output_buffer
-  end
-
-  test "form with rich_text_area" do
-    expected = '<form id="create-message" action="/messages" accept-charset="UTF-8" data-remote="true" method="post">'\
-               '<input name="utf8" type="hidden" value="&#x2713;" />'\
-               '<input type="hidden" name="message[content]" id="message_content_trix_input_message" />'\
-               '<trix-editor id="message_content" input="message_content_trix_input_message" class="trix-content" data-direct-upload-url="http://test.host/rails/active_storage/direct_uploads" data-blob-url-template="http://test.host/rails/active_storage/blobs/:signed_id/:filename">'\
-               '</trix-editor></form>'
-
-    form_with(model: Message.new, scope: :message, id: "create-message") do |form|
-      form.rich_text_area(:content)
-    end
-
-    assert_dom_equal expected, output_buffer
-  end
-
-  test "form with rich_text_area providing class option" do
-    expected = '<form id="create-message" action="/messages" accept-charset="UTF-8" data-remote="true" method="post">'\
-                   '<input name="utf8" type="hidden" value="&#x2713;" />'\
-                   '<input type="hidden" name="message[content]" id="message_content_trix_input_message" />'\
-                   '<trix-editor id="message_content" input="message_content_trix_input_message" class="custom-class" data-direct-upload-url="http://test.host/rails/active_storage/direct_uploads" data-blob-url-template="http://test.host/rails/active_storage/blobs/:signed_id/:filename">'\
-                   '</trix-editor></form>'
-
-    form_with(model: Message.new, scope: :message, id: "create-message") do |form|
-      form.rich_text_area(:content, class: "custom-class")
-    end
-
-    assert_dom_equal expected, output_buffer
-  end
 end