nested_under_indifferent_access

Called when object is nested under an object that receives #with_indifferent_access. This method will be called on the current object by the enclosing object and is aliased to #with_indifferent_access by default. Subclasses of Hash may overwrite this method to return self if converting to an +ActiveSupport::HashWithIndifferentAccess+ would not be desirable.

b = {:b => 1}
{:a => b}.with_indifferent_access["a"] # calls b.nested_under_indifferent_access