Fixed a bug where #501 broke compatibility with Enumerable (#531)

Author: yuki24

lib/jbuilder/collection_renderer.rb

@@ -106,4 +106,11 @@ def collection_with_template(view, template)
         end
     end
   end
+
+  class EnumerableCompat < ::SimpleDelegator
+    # Rails 6.1 requires this.
+    def size(*args, &block)
+      __getobj__.count(*args, &block)
+    end
+  end
 end

lib/jbuilder/jbuilder_template.rb

@@ -145,6 +145,7 @@ def _render_partial_with_options(options)
       collection = options.delete(:collection) || []
       partial = options.delete(:partial)
       options[:locals].merge!(json: self)
+      collection = EnumerableCompat.new(collection) if collection.respond_to?(:count) && !collection.respond_to?(:size)
 
       if options.has_key?(:layout)
         raise ::NotImplementedError, "The `:layout' option is not supported in collection rendering."

test/jbuilder_template_test.rb

@@ -294,7 +294,6 @@ class JbuilderTemplateTest < ActiveSupport::TestCase
     test "works with an enumerable object" do
       enumerable_class = Class.new do
         include Enumerable
-        alias length count # Rails 6.1 requires this.
 
         def each(&block)
           [].each(&block)