Do not assume that a #foo_id method implies a #foo method (fixes @daxter's regression in 600b539)

Author: James McKinney

lib/active_admin/views/components/attributes_table.rb

@@ -56,7 +56,13 @@ def content_for(attr)
       end
 
       def find_attr_value(attr)
-        attr.is_a?(Proc) ? attr.call(@record) : @record.send(attr.to_s.gsub(/_id\z/,''))
+        if attr.is_a?(Proc)
+          attr.call(@record)
+        elsif attr.to_s[/\A(.+)_id\z/] && @record.respond_to?($1.to_sym)
+          @record.send($1.to_sym)
+        else
+          @record.send(attr.to_sym)
+        end
       end
     end