fix(ViewHelper) create a new helper in case controller wasn't used

lib/react/rails/view_helper.rb

@@ -9,8 +9,15 @@ module ViewHelper
       # The default is {React::Rails::ComponentMount}
       mattr_accessor :helper_implementation_class
 
+      # Render a React component into the view
+      # using the {helper_implementation_class}
+      #
+      # If called during a Rails controller-managed request, use the instance
+      # created by the controller.
+      #
+      # Otherwise, make a new instance.
       def react_component(*args, &block)
-        helper_obj = @__react_component_helper
+        helper_obj = @__react_component_helper ||= helper_implementation_class.new
         helper_obj.react_component(*args, &block)
       end
     end

test/react/rails/react_rails_ujs_test.rb

@@ -0,0 +1,123 @@
+require 'test_helper'
+
+require 'capybara/rails'
+require 'capybara/poltergeist'
+
+Capybara.javascript_driver = :poltergeist
+Capybara.app = Rails.application
+
+# Useful for debugging.
+# Just put page.driver.debug in your test and it will
+# pause and throw up a browser
+Capybara.register_driver :poltergeist_debug do |app|
+  Capybara::Poltergeist::Driver.new(app, :inspector => true)
+end
+Capybara.javascript_driver = :poltergeist_debug
+
+class ReactRailsUJSTest < ActionDispatch::IntegrationTest
+  include Capybara::DSL
+
+  setup do
+    Capybara.current_driver = Capybara.javascript_driver
+  end
+
+  test 'ujs object present on the global React object and has our methods' do
+    visit '/pages/1'
+    assert page.has_content?('Hello Bob')
+
+    # the exposed ujs object is present
+    ujs_present = page.evaluate_script('typeof ReactRailsUJS === "object";')
+    assert_equal(ujs_present, true)
+
+    # it contains the constants
+    class_name_present = page.evaluate_script('ReactRailsUJS.CLASS_NAME_ATTR === "data-react-class";')
+    assert_equal(class_name_present, true)
+    props_present = page.evaluate_script('ReactRailsUJS.PROPS_ATTR === "data-react-props";')
+    assert_equal(props_present, true)
+
+    #it contains the methods
+    find_dom_nodes_present = page.evaluate_script('typeof ReactRailsUJS.findDOMNodes === "function";')
+    assert_equal(find_dom_nodes_present, true)
+    mount_components_present = page.evaluate_script('typeof ReactRailsUJS.mountComponents === "function";')
+    assert_equal(mount_components_present, true)
+    unmount_components_present = page.evaluate_script('typeof ReactRailsUJS.unmountComponents === "function";')
+    assert_equal(unmount_components_present, true)
+  end
+
+  test 'react_ujs works with rendered HTML' do
+    visit '/pages/1'
+    assert page.has_content?('Hello Bob')
+
+    page.click_button 'Goodbye'
+    assert page.has_no_content?('Hello Bob')
+    assert page.has_content?('Goodbye Bob')
+  end
+
+  test 'react_ujs works with Turbolinks' do
+    visit '/pages/1'
+    assert page.has_content?('Hello Bob')
+
+    # Try clicking links.
+    page.click_link('Alice')
+    assert page.has_content?('Hello Alice')
+
+    page.click_link('Bob')
+    assert page.has_content?('Hello Bob')
+
+    # Try going back.
+    page.execute_script('history.back();')
+    assert page.has_content?('Hello Alice')
+
+    wait_for_turbolinks_to_be_available()
+
+    # Try Turbolinks javascript API.
+    page.execute_script('Turbolinks.visit("/pages/2");')
+    assert page.has_content?('Hello Alice')
+
+    wait_for_turbolinks_to_be_available()
+
+    page.execute_script('Turbolinks.visit("/pages/1");')
+    assert page.has_content?('Hello Bob')
+
+    # Component state is not persistent after clicking current page link.
+    page.click_button 'Goodbye'
+    assert page.has_content?('Goodbye Bob')
+
+    page.click_link('Bob')
+    assert page.has_content?('Hello Bob')
+  end
+
+  test 'react_ujs can unmount/mount using a selector reference' do
+    visit '/pages/1'
+    assert page.has_content?('Hello Bob')
+
+    page.click_link "Unmount at selector #test-component"
+    assert page.has_no_content?('Hello Bob')
+
+    page.click_link "Mount at selector #test-component"
+    assert page.has_content?('Hello Bob')
+  end
+
+  test 'react_ujs can unmount/mount using a dom node context' do
+    visit '/pages/1'
+    assert page.has_content?('Hello Bob')
+
+    page.click_link "Unmount at node #test-component"
+    assert page.has_no_content?('Hello Bob')
+
+    page.click_link "Mount at node #test-component"
+    assert page.has_content?('Hello Bob')
+  end
+
+  test 'react server rendering also gets mounted on client' do
+    visit '/server/1'
+    assert_match(/data-react-class=\"TodoList\"/, page.html)
+    assert_match(/yep/, page.find("#status").text)
+  end
+
+  test 'react server rendering does not include internal properties' do
+    visit '/server/1'
+    assert_no_match(/tag=/, page.html)
+    assert_no_match(/prerender=/, page.html)
+  end
+end

test/react/rails/view_helper_test.rb

@@ -1,123 +1,20 @@
-require 'test_helper'
+require "test_helper"
 
-require 'capybara/rails'
-require 'capybara/poltergeist'
-
-Capybara.javascript_driver = :poltergeist
-Capybara.app = Rails.application
-
-# Useful for debugging.
-# Just put page.driver.debug in your test and it will
-# pause and throw up a browser
-Capybara.register_driver :poltergeist_debug do |app|
-  Capybara::Poltergeist::Driver.new(app, :inspector => true)
+# Provide direct access to the view helper methods
+class ViewHelperHelper
+  extend React::Rails::ViewHelper
 end
-Capybara.javascript_driver = :poltergeist_debug
-
-class ViewHelperTest < ActionDispatch::IntegrationTest
-  include Capybara::DSL
-
-  setup do
-    Capybara.current_driver = Capybara.javascript_driver
-  end
-
-  test 'ujs object present on the global React object and has our methods' do
-    visit '/pages/1'
-    assert page.has_content?('Hello Bob')
-
-    # the exposed ujs object is present
-    ujs_present = page.evaluate_script('typeof ReactRailsUJS === "object";')
-    assert_equal(ujs_present, true)
-
-    # it contains the constants
-    class_name_present = page.evaluate_script('ReactRailsUJS.CLASS_NAME_ATTR === "data-react-class";')
-    assert_equal(class_name_present, true)
-    props_present = page.evaluate_script('ReactRailsUJS.PROPS_ATTR === "data-react-props";')
-    assert_equal(props_present, true)
-
-    #it contains the methods
-    find_dom_nodes_present = page.evaluate_script('typeof ReactRailsUJS.findDOMNodes === "function";')
-    assert_equal(find_dom_nodes_present, true)
-    mount_components_present = page.evaluate_script('typeof ReactRailsUJS.mountComponents === "function";')
-    assert_equal(mount_components_present, true)
-    unmount_components_present = page.evaluate_script('typeof ReactRailsUJS.unmountComponents === "function";')
-    assert_equal(unmount_components_present, true)
-  end
-
-  test 'react_ujs works with rendered HTML' do
-    visit '/pages/1'
-    assert page.has_content?('Hello Bob')
-
-    page.click_button 'Goodbye'
-    assert page.has_no_content?('Hello Bob')
-    assert page.has_content?('Goodbye Bob')
-  end
-
-  test 'react_ujs works with Turbolinks' do
-    visit '/pages/1'
-    assert page.has_content?('Hello Bob')
-
-    # Try clicking links.
-    page.click_link('Alice')
-    assert page.has_content?('Hello Alice')
-
-    page.click_link('Bob')
-    assert page.has_content?('Hello Bob')
-
-    # Try going back.
-    page.execute_script('history.back();')
-    assert page.has_content?('Hello Alice')
-
-    wait_for_turbolinks_to_be_available()
-
-    # Try Turbolinks javascript API.
-    page.execute_script('Turbolinks.visit("/pages/2");')
-    assert page.has_content?('Hello Alice')
-
-    wait_for_turbolinks_to_be_available()
-
-    page.execute_script('Turbolinks.visit("/pages/1");')
-    assert page.has_content?('Hello Bob')
-
-    # Component state is not persistent after clicking current page link.
-    page.click_button 'Goodbye'
-    assert page.has_content?('Goodbye Bob')
-
-    page.click_link('Bob')
-    assert page.has_content?('Hello Bob')
-  end
-
-  test 'react_ujs can unmount/mount using a selector reference' do
-    visit '/pages/1'
-    assert page.has_content?('Hello Bob')
-
-    page.click_link "Unmount at selector #test-component"
-    assert page.has_no_content?('Hello Bob')
-
-    page.click_link "Mount at selector #test-component"
-    assert page.has_content?('Hello Bob')
-  end
-
-  test 'react_ujs can unmount/mount using a dom node context' do
-    visit '/pages/1'
-    assert page.has_content?('Hello Bob')
-
-    page.click_link "Unmount at node #test-component"
-    assert page.has_no_content?('Hello Bob')
-
-    page.click_link "Mount at node #test-component"
-    assert page.has_content?('Hello Bob')
-  end
 
-  test 'react server rendering also gets mounted on client' do
-    visit '/server/1'
-    assert_match(/data-react-class=\"TodoList\"/, page.html)
-    assert_match(/yep/, page.find("#status").text)
+class ViewHelperTest < ActionView::TestCase
+  test "view helper can be called directly" do
+    expected_html = %{<div data-react-class="Component" data-react-props="{&quot;a&quot;:&quot;b&quot;}"></div>}
+    rendered_html = ViewHelperHelper.react_component("Component", {a: "b"})
+    assert_equal(expected_html, rendered_html)
   end
 
-  test 'react server rendering does not include internal properties' do
-    visit '/server/1'
-    assert_no_match(/tag=/, page.html)
-    assert_no_match(/prerender=/, page.html)
+  test "view helper can be used in stand-alone views" do
+    @name = "React-Rails"
+    render template: "pages/show"
+    assert_includes(rendered, "React-Rails")
   end
 end