support rendering partials in components

Co-Authored-By: Aaron Patterson <[email protected]>

Author: joelhawksley

lib/action_view/component/base.rb

@@ -33,6 +33,8 @@ class Base < ActionView::Base
       include ActiveSupport::Configurable
       include ActionController::RequestForgeryProtection
 
+      delegate :render, to: :view_context
+
       # Entrypoint for rendering components. Called by ActionView::Base#render.
       #
       # view_context: ActionView context from calling view
@@ -61,6 +63,7 @@ class Base < ActionView::Base
       def render_in(view_context, *args, &block)
         self.class.compile
         self.controller = view_context.controller
+        @view_context = view_context
         @view_renderer ||= view_context.view_renderer
         @lookup_context ||= view_context.lookup_context
         @view_flow ||= view_context.view_flow
@@ -143,7 +146,7 @@ def type
 
       private
 
-      attr_reader :content
+      attr_reader :content, :view_context
     end
   end
 end

test/action_view/component_test.rb

@@ -124,6 +124,12 @@ def test_renders_url_helper
     assert_includes result.text, "http://test.host/"
   end
 
+  def test_renders_another_component
+    result = render_inline(AnotherComponent)
+
+    assert_equal trim_result(result.css("div").first.to_html), "<div>hello,world!</div>"
+  end
+
   def test_template_changes_are_not_reflected_in_production
     ActionView::Base.cache_template_loading = true
 

test/app/components/another_component.html.erb

@@ -0,0 +1 @@
+<%= render(MyComponent) %>

test/app/components/another_component.rb

@@ -0,0 +1,5 @@
+# frozen_string_literal: true
+
+class AnotherComponent < ActionView::Component::Base
+  def initialize(*); end
+end