在 rails 中设置一个可选字段 [英] Make a field optional in rails

问题描述

我使用回形针将头像附加到用户，效果很好，但是当新用户尝试注册时，它抱怨头像 bieng 太小且类型不正确.

I use paperclip to attach an avatar to users, which works fine but when a new user attempts to register it complains about the avatar bieng too small and not of the right type.

这是我验证我的头像的方式:

This is how i validate my avatars:

validates_attachment_size :avatar, :less_than => 1.megabytes
validates_attachment_content_type :avatar, :content_type => ['image/jpeg', 'image/png', 'image/gif']

这是我尝试注册时遇到的错误.

This is the error i get when i try to register.

There were problems with the following fields:

* Avatar file size file size must be between 0 and 1048576 bytes.
* Avatar content type is not included in the list

有没有办法让头像可以是空白的?

is there anyway to make it so that avatar can be blank?

推荐答案

我不知道这是否可行，但请尝试:

I don't know if this is gonna work but try:

validates_attachment_size :avatar, :less_than => 1.megabytes, :if => avatar_changed?
validates_attachment_content_type :avatar, :content_type => ['image/jpeg', 'image/png', 'image/gif'], :if => avatar_changed?

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