Initial Attachment rendering support

app/views/active_storage/blobs/_blob.html.erb

@@ -0,0 +1,7 @@
+<h2>Engine <code>blob/_blob</code>:</h2>
+
+<%= debug blob %>
+
+<figure>
+  <%= image_tag rails_blob_path(blob) %>
+</figure>

lib/active_text/attachment.rb

@@ -74,8 +74,12 @@ module ActiveText
     end
 
     def to_html
+      if attachable.respond_to?(:to_partial_path)
+        ApplicationController.render(self)
+      else
         HtmlConversion.node_to_html(node)
       end
+    end
 
     def to_s
       to_html

lib/active_text/content.rb

@@ -46,7 +46,7 @@ module ActiveText
     end
 
     def to_html
-      fragment.to_html
+      render_attachments(&:to_html).to_html
     end
 
     def to_s