Merge pull request activeadmin#4216 from leonelgalan/hash_like_atttribute_table

Allows Hash-like objects to be used in attributes_table

Author: timoschilling

lib/active_admin/views/components/attributes_table.rb

@@ -5,7 +5,7 @@ class AttributesTable < ActiveAdmin::Component
       builder_method :attributes_table_for
 
       def build(obj, *attrs)
-        @collection     = is_array?(obj) ? obj : [obj]
+        @collection     = Array.wrap(obj)
         @resource_class = @collection.first.class
         options = { }
         options[:for] = @collection.first if single_record?
@@ -102,10 +102,6 @@ def reflection_for(klass, method)
       def single_record?
         @single_record ||= @collection.size == 1
       end
-      
-      def is_array?(obj)
-        obj.respond_to?(:each) && obj.respond_to?(:first) && !obj.is_a?(Hash)
-      end
     end
 
   end