Ruby on Rails PaperClip Gem validate_attachement错误

Question

我google搜索/堆栈溢出了几个小时,没有找到解决这个问题的方法.我想知道我的PaperClip安装是否以某种方式不成功.我正在尝试验证模型文件夹中的图像附件:

validates :image, presence: true,
content_type: { content_type: ['image/jpeg', 'image/jpg', 'image/png', 'image/gif']},
size: { less_than: 5.megabytes }

我也尝试过类似于github上的read me文件的代码:

validates_attachment :image, :presence => true,
:content_type => { :content_type => 'image/jpeg', 'image/jpg', 'image/png', 'image/gif' },
:size => { less_than: => 5.megabytes }

我试图使用个人验证

validates_attachment_presence :image
validates_attachment_content_type :image,:content_type => ['image/jpeg', 'image/jpg', 'image/png', 'image/gif']
validates_attachment_size :image,:less_than => 5.megabytes

在所有情况下我都会收到错误.或者:

Routing Error
undefined method `before_image_post_process' for #<Class:0x00000101461750>
Try running rake routes for more information on available routes.

要么:

NoMethodError in PinsController#index
undefined method `key?' for nil:NilClass

Answer 1

你有has_attached_file :image你的文件吗？如果是这样,请确保它在之前validates_attachment.