Cable: Generate .js or .coffee files while generating channel as per the javascript engine of the application

- Now we will detect what javascript engine user is using and based on
  that we will generate either `.js` or `.coffee` version of the channel
  file.
- This also needs a change in coffee-rails to override the `js_template`
  method. Related PR https://github.com/rails/coffee-rails/pull/72.
- Currently coffee-rails gem sets
  `config.app_generators.javascript_engine` to `:coffee` and using this
  information we override the `js_template` to set the extension as
  `.coffee` in coffee-rails gem.
- Using this approach, we can keep the `channel.js` and `channel.coffee`
  files in the Rails repository itself.
- Additionally the `js_template` method can act as public interface for
  coffee-rails gem to hook into and change the extension to `.coffee`
  without maintaining the actual asset files.

[Prathamesh Sonpatki, Matthew Draper]

2 files changed, 24 insertions, 4 deletions

diff --git a/railties/lib/rails/generators/named_base.rb b/railties/lib/rails/generators/named_base.rb
index efbf51ddfb..ee076eb711 100644
--- a/railties/lib/rails/generators/named_base.rb
+++ b/railties/lib/rails/generators/named_base.rb
@@ -26,6 +26,10 @@ module Rails
             super
           end
         end
+
+        def js_template(source, destination)
+          template(source + '.js', destination + '.js')
+        end
       end
 
       protected
diff --git a/railties/test/generators/channel_generator_test.rb b/railties/test/generators/channel_generator_test.rb
index d58b54ac24..e3edde681f 100644
--- a/railties/test/generators/channel_generator_test.rb
+++ b/railties/test/generators/channel_generator_test.rb
@@ -24,8 +24,24 @@ class ChannelGeneratorTest < Rails::Generators::TestCase
       assert_match(/class ChatChannel < ApplicationCable::Channel/, channel)
     end
 
-    assert_file "app/assets/javascripts/channels/chat.coffee" do |channel|
-      assert_match(/App.cable.subscriptions.create "ChatChannel"/, channel)
+    assert_file "app/assets/javascripts/channels/chat.js" do |channel|
+      assert_match(/App.chat = App.cable.subscriptions.create\("ChatChannel/, channel)
+    end
+  end
+
+  def test_channel_with_multiple_actions_is_created
+    run_generator ['chat', 'speak', 'mute']
+
+    assert_file "app/channels/chat_channel.rb" do |channel|
+      assert_match(/class ChatChannel < ApplicationCable::Channel/, channel)
+      assert_match(/def speak/, channel)
+      assert_match(/def mute/, channel)
+    end
+
+    assert_file "app/assets/javascripts/channels/chat.js" do |channel|
+      assert_match(/App.chat = App.cable.subscriptions.create\("ChatChannel/, channel)
+      assert_match(/,\n\n  speak/, channel)
+      assert_match(/,\n\n  mute: function\(\) \{\n    return this\.perform\('mute'\);\n  \}\n\}\);/, channel)
     end
   end
 
@@ -36,7 +52,7 @@ class ChannelGeneratorTest < Rails::Generators::TestCase
       assert_match(/class ChatChannel < ApplicationCable::Channel/, channel)
     end
 
-    assert_no_file "app/assets/javascripts/channels/chat.coffee"
+    assert_no_file "app/assets/javascripts/channels/chat.js"
   end
 
   def test_cable_js_is_created_if_not_present_already
@@ -52,7 +68,7 @@ class ChannelGeneratorTest < Rails::Generators::TestCase
     run_generator ['chat'], behavior: :revoke
 
     assert_no_file "app/channels/chat_channel.rb"
-    assert_no_file "app/assets/javascripts/channels/chat.coffee"
+    assert_no_file "app/assets/javascripts/channels/chat.js"
 
     assert_file "app/channels/application_cable/channel.rb"
     assert_file "app/channels/application_cable/connection.rb"