new(owner_class_name = nil, reflection = nil, source_reflection = nil) public

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# File activerecord/lib/active_record/associations.rb, line 105
    def initialize(owner_class_name = nil, reflection = nil, source_reflection = nil)
      if owner_class_name && reflection && source_reflection
        super("Cannot have a has_many :through association '#{owner_class_name}##{reflection.name}' on the polymorphic object '#{source_reflection.class_name}##{source_reflection.name}' without 'source_type'. Try adding 'source_type: \"#{reflection.name.to_s.classify}\"' to 'has_many :through' definition.")
      else
        super("Cannot have a has_many :through association.")
      end
    end
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