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-rw-r--r--activesupport/lib/active_support/json/encoding.rb3
1 files changed, 2 insertions, 1 deletions
diff --git a/activesupport/lib/active_support/json/encoding.rb b/activesupport/lib/active_support/json/encoding.rb
index e8e9308495..acccb62aea 100644
--- a/activesupport/lib/active_support/json/encoding.rb
+++ b/activesupport/lib/active_support/json/encoding.rb
@@ -4,7 +4,8 @@ module ActiveSupport
end
# Converts a Ruby object into a JSON string.
- def self.encode(value, options = {})
+ def self.encode(value, options = nil)
+ options ||= {}
seen = (options[:seen] ||= [])
raise CircularReferenceError, 'object references itself' if seen.include?(value.object_id)
seen << value.object_id