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Ruby on Rails宝石回形针如何生成丢失的图像

[英]Ruby on rails gem paperclip How to generate missing image

I uploaded a missing.png to public/images/ folder. 我将missing.png上传到public / images /文件夹。 But the the missing.png not showing correctly. 但是missing.png无法正确显示。 The website requires images/small/missing.png So I guest I should generate the missing.png for thumb small medium large size. 该网站要求images / small / missing.png,所以我请客,我应该为大中小尺寸的拇指生成missing.png。 What should I do? 我该怎么办?

Update 1: I manually create a folder public/images/small and put missing.png inside the small folder. 更新1:我手动创建一个文件夹public / images / small,并将missing.png放在小文件夹中。 The website shows the missing.png. 该网站显示missing.png。 But What's is the correct way to generate all size of missing.png? 但是生成所有大小的missing.png的正确方法是什么?

尝试将其添加到模型中:

 has_attached_file :image, styles: { :small => "150x150>", medium: "300x300>", thumb: "100x100>" }, default_url: "/images/:style/missing.png"

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