feat(ServerRendering) generate an initializer to precompile the manifest; support --skip-server-rendering

Author: rmosolgo

README.md

@@ -51,7 +51,7 @@ where you will put your components
   //= require react_ujs
   //= require components
   ```
-- create a `server_rendering.js` manifest file
+- create a `server_rendering.js` manifest file and precompile it with `config/initializers/react_server_rendering.rb`. (Use `--skip-server-rendering` if you don't want this.)
 
 ## Usage
 

lib/generators/react/install_generator.rb

@@ -11,9 +11,16 @@ class InstallGenerator < ::Rails::Generators::Base
         default: false,
         desc: 'Skip Git keeps'
 
+      class_option :skip_server_rendering,
+        type: :boolean,
+        default: false,
+        desc: "Don't generate server_rendering.js or config/initializers/react_server_rendering.rb"
+
       def create_directory
         empty_directory 'app/assets/javascripts/components'
-        create_file 'app/assets/javascripts/components/.gitkeep' unless options[:skip_git]
+        if !options[:skip_git]
+          create_file 'app/assets/javascripts/components/.gitkeep'
+        end
       end
 
       def inject_react
@@ -49,8 +56,11 @@ def create_components
       end
 
       def create_server_rendering
-        file_path = 'app/assets/javascripts/server_rendering.js'
-        template("server_rendering.js", file_path)
+        return if options[:skip_server_rendering]
+        manifest_path = "app/assets/javascripts/server_rendering.js"
+        template("server_rendering.js", manifest_path)
+        initializer_path = "config/initializers/react_server_rendering.rb"
+        template("react_server_rendering.rb", initializer_path)
       end
 
       private

lib/generators/templates/react_server_rendering.rb

@@ -0,0 +1,2 @@
+# To render React components in production, precompile the server rendering manifest:
+Rails.application.config.assets.precompile += ["server_rendering.js"]

test/generators/install_generator_test.rb

@@ -70,6 +70,18 @@ def copy_directory(dir)
     assert_file server_rendering_file_path, %r{//= require ./components\n}
   end
 
+  test "creates server rendering initializer" do
+    run_generator
+    initializer_path = "config/initializers/react_server_rendering.rb"
+    assert_file(initializer_path, %r{Rails.application.config.assets.precompile \+= \["server_rendering.js"\]})
+  end
+
+  test "skipping server rendering" do
+    run_generator %w(--skip-server-rendering)
+    assert_no_file "config/initializers/react_server_rendering.rb"
+    assert_no_file "app/assets/javascripts/server_rendering.js"
+  end
+
   def init_application_js(content)
     FileUtils.mkdir_p destination_root + '/app/assets/javascripts/'
     File.write destination_root + '/app/assets/javascripts/application.js', content