POC for busted partial rendering

app/controllers/application_controller.rb

@@ -1,3 +1,13 @@
 class ApplicationController < ActionController::Base
   protect_from_forgery with: :exception
+
+  def index
+    a = {}
+    b = {}
+    def a.to_partial_path; 'a'; end
+    def b.to_partial_path; 'b'; end
+
+    @het_collection = [a, b]
+    @hom_collection = [a, a]
+  end
 end

app/views/application/_a.html.erb

@@ -0,0 +1,5 @@
+<li style="color: <%= defined?(a_iteration) ? "#090" : "#f00" %>">
+  <h3>/app/views/application/_a.html.erb</h3>
+  defined?(a_iteration):
+  <%= defined?(a_iteration) %>
+</li>

app/views/application/_b.html.erb

@@ -0,0 +1,5 @@
+<li style="color: <%= defined?(b_iteration) ? "#090" : "#f00" %>">
+  <h3>/app/views/application/_b.html.erb</h3>
+  defined?(b_iteration):
+  <%= defined?(b_iteration) %>
+</li>

app/views/application/index.html.erb

@@ -0,0 +1,13 @@
+<code>
+<h2>render [a, a]</h2>
+<ul><%= render @hom_collection %></ul>
+
+<h2>render [a, b]</h2>
+<ul><%= render @het_collection %></ul>
+
+<h2>render partial: [a, a]</h2>
+<ul><%= render partial: @hom_collection %></ul>
+
+<h2>render partial: [a, b]</h2>
+<ul><%= render partial: @het_collection %></ul>
+</code>

config/routes.rb

@@ -1,3 +1,4 @@
 Rails.application.routes.draw do
   # For details on the DSL available within this file, see http://guides.rubyonrails.org/routing.html
+  root to: 'application#index'
 end