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new(reflection = nil) public

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# File activerecord/lib/active_record/associations.rb, line 168
    def initialize(reflection = nil)
      if reflection
        through_reflection      = reflection.through_reflection
        source_reflection_names = reflection.source_reflection_names
        source_associations     = reflection.through_reflection.klass._reflections.keys
        super("Could not find the source association(s) #{source_reflection_names.collect(&:inspect).to_sentence(two_words_connector: ' or ', last_word_connector: ', or ')} in model #{through_reflection.klass}. Try 'has_many #{reflection.name.inspect}, :through => #{through_reflection.name.inspect}, :source => <name>'. Is it one of #{source_associations.to_sentence(two_words_connector: ' or ', last_word_connector: ', or ')}?")
      else
        super("Could not find the source association(s).")
      end
    end
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