posts_limit.rb 441 Bytes
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module PostsLimit
  module ClassMethods
    def posts_per_page_limit
      15
    end

    def posts_per_page_options
      [5, 10, 15]
    end
  end

  def self.included(klass)
    klass.send(:extend, PostsLimit::ClassMethods)
    klass.class_eval do
      def posts_per_page_with_limit
        [self.class.posts_per_page_limit, posts_per_page_without_limit].min
      end
      alias_method_chain :posts_per_page, :limit
    end
  end
end