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-rw-r--r--activemodel/lib/active_model/serializers/json.rb3
1 files changed, 1 insertions, 2 deletions
diff --git a/activemodel/lib/active_model/serializers/json.rb b/activemodel/lib/active_model/serializers/json.rb
index a9d92eb92a..205b84ddb4 100644
--- a/activemodel/lib/active_model/serializers/json.rb
+++ b/activemodel/lib/active_model/serializers/json.rb
@@ -10,8 +10,7 @@ module ActiveModel
included do
extend ActiveModel::Naming
- class_attribute :include_root_in_json, instance_writer: false
- self.include_root_in_json = false
+ class_attribute :include_root_in_json, instance_writer: false, default: false
end
# Returns a hash representing the model. Some configuration can be