Module: IsolateAssets::EngineExtension

Defined in:
lib/isolate_assets/engine_extension.rb

Instance Method Summary collapse

Instance Method Details

#isolate_assets(assets_subdir: "assets") ⇒ Object 



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# File 'lib/isolate_assets/engine_extension.rb', line 5

def isolate_assets(assets_subdir: "assets")
  engine_class = self

  # Exclude engine assets from host's asset pipeline (if one exists)
  initializer "#{engine_name}.isolate_assets.exclude_from_pipeline", before: :load_config_initializers do |app|
    next unless app.config.respond_to?(:assets) && app.config.assets

    asset_base = engine_class.root.join("app", assets_subdir)
    app.config.assets.excluded_paths ||= []
    if asset_base.exist?
      asset_base.children.select(&:directory?).each do |subdir|
        app.config.assets.excluded_paths << subdir.to_s
      end
    end
  end

  # Sprockets doesn't respect excluded_paths, so filter manually
  initializer "#{engine_name}.isolate_assets.filter_asset_paths", after: :load_config_initializers do |app|
    next unless app.config.respond_to?(:assets) && app.config.assets
    next unless app.config.assets.excluded_paths.present?

    excluded = app.config.assets.excluded_paths.map(&:to_s)
    app.config.assets.paths = app.config.assets.paths.reject do |path|
      excluded.include?(path.to_s)
    end
  end

  initializer "#{engine_name}.isolate_assets", before: :set_routes_reloader do
    assets = IsolateAssets::Assets.new(engine: engine_class, assets_subdir: assets_subdir)
    controller_class = IsolateAssets.build_controller(assets)

    if engine_class.respond_to?(:railtie_namespace) && engine_class.railtie_namespace
      IsolateAssets.expose_helpers(engine_class.railtie_namespace, assets)
    end

    engine_class.routes.prepend do
      get "/assets/*file", to: controller_class.action(:show), as: :isolated_asset
    end
  end
end