## mark a section (Learn more)

% irb irb(main):001:0> require 'active_record' LoadError: no such file to load -- active_record from (irb):1:in `require' from (irb):1 irb(main):002:0> require 'rubygems' => true irb(main):003:0> require 'active_record' => true irb(main):004:0> defined? ActiveRecord::Associations::BelongsToPolymorphicAssociation => "constant" irb(main):005:0>

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