1 files changed, 6 insertions, 0 deletions
diff --git a/activeresource/lib/active_resource/base.rb b/activeresource/lib/active_resource/base.rb
index d31db9f0ba..80af7e7adf 100644
--- a/activeresource/lib/active_resource/base.rb
+++ b/activeresource/lib/active_resource/base.rb
@@ -621,6 +621,12 @@ module ActiveResource
       #   # => /posts/5/comments/1.xml?active=1
       #
       def element_path(id, prefix_options = {}, query_options = nil)
+
+        p_options = HashWithIndifferentAccess.new(prefix_options)
+        prefix_parameters.each do |p|
+          raise MissingPrefixParam if p_options[p].blank?
+        end
+
         prefix_options, query_options = split_options(prefix_options) if query_options.nil?
         "#{prefix(prefix_options)}#{collection_name}/#{URI.escape id.to_s}.#{format.extension}#{query_string(query_options)}"
       end