Support rendering components from controllers

Author: nning

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    svelte-rails (0.1.0)
+    svelte-rails (0.2.0)
       execjs
       railties (>= 5.2)
 

README.md

@@ -31,10 +31,22 @@ https://github.com/nning/svelte-rails-demo/commits/master
 <%= svelte_component :Hello, name: 'Svelte' %>
 ```
 
+## Controller Renderer
+
+```ruby
+class TodoController < ApplicationController
+  def index
+    @todos = Todo.all
+    render component: 'TodoList', props: { todos: @todos }
+  end
+end
+```
+
+`prerender` is activated by default, can be disabled with `prerender: false`.
+
 ## Missing Features
 
 * HMR and Bundle consistency (server-rendered HTML is cached and client-side updates on changes to the sources)
-* Render components directly from controllers
 * Generator for components
 * Render pools
 * Better documentation for setup

lib/svelte/rails.rb

@@ -7,4 +7,6 @@ module Rails
 end
 
 require 'svelte/rails/view_helper'
+require 'svelte/rails/controller_renderer'
+
 require 'svelte/rails/railtie' if defined?(Rails)

lib/svelte/rails/controller_renderer.rb

@@ -0,0 +1,26 @@
+require 'svelte/rails/view_helper'
+
+module Svelte
+  module Rails
+    class ControllerRenderer
+      include Svelte::Rails::ViewHelper
+      # include ActionView::Helpers::TagHelper
+      # include ActionView::Helpers::TextHelper
+
+      attr_accessor :output_buffer
+
+      # @return [String] HTML for `component_name` with `options[:props]`
+      def call(component_name, options, &block)
+        props = options.fetch(:props, {})
+        options = default_options.merge(options.slice(:data, :aria, :tag, :class, :id, :prerender, :camelize_props))
+        svelte_component(component_name, props, options, &block)
+      end
+
+      private
+
+      def default_options
+        { prerender: true }
+      end
+    end
+  end
+end

lib/svelte/rails/railtie.rb

@@ -2,12 +2,21 @@
 
 module Svelte::Rails
   class Railtie < ::Rails::Railtie
-    initializer 'react_rails.setup_view_helpers', after: :load_config_initializers, group: :all do |app|
+    initializer 'svelte_rails.setup_view_helpers', after: :load_config_initializers, group: :all do |app|
       ActiveSupport.on_load(:action_view) do
         include ::Svelte::Rails::ViewHelper
       end
     end
 
+    initializer 'svelte_rails.add_component_renderer', group: :all do |app|
+      ActionController::Renderers.add :component do |component_name, options|
+        renderer = ::Svelte::Rails::ControllerRenderer.new
+        html = renderer.call(component_name, options)
+        render_options = options.merge(inline: html)
+        render(render_options)
+      end
+    end
+
     rake_tasks do
       load 'svelte/rails/install_task.rake'
     end

lib/svelte/rails/version.rb

@@ -1,5 +1,5 @@
 module Svelte
   module Rails
-    VERSION = "0.1.0"
+    VERSION = '0.2.0'
   end
 end