我有Rails(4)应用程序,我使用carrierwave将图像上传到生产中的S3存储桶(以及dev中的本地存储桶)。它一切正常,但我想重构我的代码。
我的模特:
class Blogging < ActiveRecord::Base
mount_uploader :picture1, Picture1Uploader
mount_uploader :picture2, Picture1Uploader
mount_uploader :picture3, Picture1Uploader
mount_uploader :picture4, Picture1Uploader
mount_uploader :picture5, Picture1Uploader
mount_uploader :picture6, Picture1Uploader
mount_uploader :picture7, Picture1Uploader
mount_uploader :picture8, Picture1Uploader
mount_uploader :picture9, Picture1Uploader
mount_uploader :picture10, Picture1Uploader
mount_uploader :picture11, Picture1Uploader
validate :picture_size
private
def picture_size
if picture1.size > 5.megabytes
errors.add(:picture1, "should be less than 5 MB")
end
end
end
经过一些重构后,我有了这个:
class Blogging < ActiveRecord::Base
for i in 1..11
mount_uploader :"picture#{i}", Picture1Uploader
end
validate :picture_size
validates :picture1, :news_title, :news_body, presence: true
private
def picture_size
pics = Array.new(11) {|i| "picture#{i+1}"}
pics.each do |p|
if p.size > 5.megabytes
errors.add(:picture1, "should be less than 5 MB")
end
end
end
end
mount_uploader
,虽然丑陋的工作很好。但我无法找到一种方法让picture_size
限制每张图片的大小(从1到11)。
我可以使用11次不同的方法或使用案例操作符来使其工作。但我正在尝试重构。
我喜欢把我的&#34;用于&#34;循环一个方法并调用它,但无法弄清楚如何。如果我定义一个方法,并调用它所有图像消失,没有文件上传(本地或S3桶)
答案 0 :(得分:1)
试试这个:
def picture_size
pics = Array.new(11) {|i| "picture#{i+1}"}.each do |pic_name|
p = self.send pic_name
if p.size > 5.megabytes
self.errors.add(:picture1, "should be less than 5 MB")
end
end
end