验证附件内容类型回形针 [英] Validate Attachment Content Type Paperclip

问题描述

是否可以在 paperclip 中强制执行内容类型"验证而不强制执行存在"验证(即允许空格)?我目前有:

Is it possible to enforce a 'content type' validation in paperclip without enforcing a 'presence' validation (i.e. allow blanks)? I currently have:

class Person < ActiveRecord::Base
  has_attached_file :picture
  validates_attachment_content_type :picture, :content_type => ['image/jpeg', 'image/jpg', 'image/png']
end

但是，如果不存在附件，这将失败.例如:

However, this fails if no attachment is present. For example:

>> @person = Person.new
>> @person.save
>> @person.errors.first
=> ["picture_content_type", "is not one of image/jpeg, image/jpg, image/png"]

是否可以仅在包含附件的情况下进行验证.

Is it possible to do the validation only if an attachment is included.

推荐答案

我不确定该方法是否是您失败的原因；这是我的简单课程

I'm not sure that method is the cause of your failure; Here's my simple class

class Image < ActiveRecord::Base
  has_attached_file :photo, {
            :styles => { :large => "700x400#", :medium=>"490x368#", :thumbnail=>"75x75#" },
            :default_url => "/images/thumbnail/blank-recipe.png"}
  validates_attachment_content_type :photo, :content_type => /image/ 
end

那么，如果我:

Image.new.valid?
#this is true

不过，您可能正在进行其他回形针验证.你能贴一个简单的例子吗?

You might be doing other paperclip validations, though. Can you post a simple example?

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