From bfe8604da17fb332e09d9cf64aa6b307ac2ad968 Mon Sep 17 00:00:00 2001
From: Jose Galisteo <ceritium@gmail.com>
Date: Fri, 30 Jul 2021 18:06:23 +0200
Subject: [PATCH] [WIP] Explore exposable concept

It allows expose on controllers and views helpers related to the turbo
component controller.
---
 lib/turbo_component.rb                        |  2 ++
 lib/turbo_component/concerns/exposable.rb     | 21 +++++++++++++++++++
 lib/turbo_component/railtie.rb                | 12 +++++++++++
 .../app/controllers/application_controller.rb |  1 +
 .../counter/component_controller.rb           |  6 +++++-
 .../app/turbo_components/counter/helpers.rb   |  9 ++++++++
 test/dummy/app/views/welcome/show.html.erb    |  2 +-
 7 files changed, 51 insertions(+), 2 deletions(-)
 create mode 100644 lib/turbo_component/concerns/exposable.rb
 create mode 100644 lib/turbo_component/railtie.rb
 create mode 100644 test/dummy/app/turbo_components/counter/helpers.rb

diff --git a/lib/turbo_component.rb b/lib/turbo_component.rb
index 15f2610..3c855ce 100644
--- a/lib/turbo_component.rb
+++ b/lib/turbo_component.rb
@@ -3,6 +3,7 @@
 require "turbo-rails"
 require "turbo_component/version"
 require "turbo_component/engine"
+require "turbo_component/railtie"
 
 module TurboComponent
   extend ActiveSupport::Autoload
@@ -19,6 +20,7 @@ module Concerns
       autoload :Options
       autoload :Routes
       autoload :Tags
+      autoload :Exposable
     end
   end
 end
diff --git a/lib/turbo_component/concerns/exposable.rb b/lib/turbo_component/concerns/exposable.rb
new file mode 100644
index 0000000..bb90463
--- /dev/null
+++ b/lib/turbo_component/concerns/exposable.rb
@@ -0,0 +1,21 @@
+module TurboComponent::Concerns::Exposable
+  extend ActiveSupport::Concern
+
+  included do
+    def self.expose_in_context(method_name)
+      prefix = self.name.deconstantize.underscore
+      module_ref = self
+      exposed_name = "#{prefix}_#{method_name}".to_sym
+
+      ApplicationController.class_eval do
+        define_method exposed_name do
+          module_ref.send(method_name, self)
+        end
+
+        helper_method exposed_name
+      end
+
+      exposed_name
+    end
+  end
+end
diff --git a/lib/turbo_component/railtie.rb b/lib/turbo_component/railtie.rb
new file mode 100644
index 0000000..e91416c
--- /dev/null
+++ b/lib/turbo_component/railtie.rb
@@ -0,0 +1,12 @@
+module TurboComponent
+  class Railtie < Rails::Railtie
+    # initializer "turbo_component.action_controller" do
+    #   ActiveSupport.on_load(:action_controller) do
+    #     helpers = Dir[Rails.root.join("app", "turbo_components", "**", "*helpers.rb")]
+    #     helpers.each do |helper_file|
+    #       module_name
+    #     end
+    #   end
+    # end
+  end
+end
diff --git a/test/dummy/app/controllers/application_controller.rb b/test/dummy/app/controllers/application_controller.rb
index 7944f9f..4e13b04 100644
--- a/test/dummy/app/controllers/application_controller.rb
+++ b/test/dummy/app/controllers/application_controller.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
 
 class ApplicationController < ActionController::Base
+  Counter::Helpers
 end
diff --git a/test/dummy/app/turbo_components/counter/component_controller.rb b/test/dummy/app/turbo_components/counter/component_controller.rb
index 91d8605..92ea53e 100644
--- a/test/dummy/app/turbo_components/counter/component_controller.rb
+++ b/test/dummy/app/turbo_components/counter/component_controller.rb
@@ -12,7 +12,11 @@ def increment
     session[:counter] ||= 0
     session[:counter] += 1
 
-    Turbo::StreamsChannel.broadcast_replace_to :counter, targets: "#counter", content: helpers.turbo_component(:counter, async: false)
+    # Since this demo is based on the session, we should scope the broadcast by "session.id"
+    turbo_stream_id = counter_turbo_stream_id
+    Turbo::StreamsChannel.broadcast_replace_to turbo_stream_id, targets: "#counter", content: helpers.turbo_component(:counter, async: false)
+
+    # We don't have to return nothing since we will update the component with Turbo::StreamChannel
     head :ok
   end
 end
diff --git a/test/dummy/app/turbo_components/counter/helpers.rb b/test/dummy/app/turbo_components/counter/helpers.rb
new file mode 100644
index 0000000..f8a4055
--- /dev/null
+++ b/test/dummy/app/turbo_components/counter/helpers.rb
@@ -0,0 +1,9 @@
+module Counter::Helpers
+  include TurboComponent::Concerns::Exposable
+
+  def self.turbo_stream_id(context)
+    "#{context.session.id}-counter"
+  end
+
+  expose_in_context :turbo_stream_id
+end
diff --git a/test/dummy/app/views/welcome/show.html.erb b/test/dummy/app/views/welcome/show.html.erb
index f3c94c1..d92db6e 100644
--- a/test/dummy/app/views/welcome/show.html.erb
+++ b/test/dummy/app/views/welcome/show.html.erb
@@ -1,5 +1,5 @@
 <h1> Welcome </h1>
-<%= turbo_stream_from :counter %>
+<%= turbo_stream_from counter_turbo_stream_id %>
 <%= turbo_component :counter, async: false do %>
   loading...
 <% end %>