Do it like => validates :photos, attached: true, content_type: ['image/png', 'image/jpg', 'image/jpeg'], size: { less_than: 500.kilobytes }, limit: { min: 1, max: 3 }, aspect_ratio: :landscape, dimens...
翻译 - 像=>一样执行：validate：photos，附加：true，content_type：['image / png'，'image / jpg'，'image / jpeg']，大小：{小于：500.kilobytes}，限制：{min： 1，最大：3}，Aspect_ratio：：landscape，尺寸：{width：{in：800..1600}
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