create

# File activerecord/lib/active_record/reflection.rb, line 16
    def self.create(macro, name, scope, options, ar)
      klass =          case macro
        when :composed_of
          AggregateReflection
        when :has_many
          HasManyReflection
        when :has_one
          HasOneReflection
        when :belongs_to
          BelongsToReflection
        else
          raise "Unsupported Macro: #{macro}"
        end

      reflection = klass.new(name, scope, options, ar)
      options[:through] ? ThroughReflection.new(reflection) : reflection
    end