验证失败时如何防止主动存储更新模型？

Question

我的用户模型has_one_attached :avatar

这里我有一些验证方法

  validate :validate_avatar_presence
  validate :validate_avatar_format
  validate :validate_avatar_size

  private

  def validate_avatar_presence
    errors.add(:avatar, 'should exist') unless self.avatar.attached?
  end

  def validate_avatar_size
    if self.avatar.attached?
      purge_avatar('File is too big') if self.avatar.blob.byte_size > 2000000
    end
  end

  def validate_avatar_format
    if self.avatar.attached?
      purge_avatar('Wrong format') unless self.avatar.blob.content_type.starts_with?('image/')
    end
  end

  def purge_avatar(msg)
    errors.add(:avatar, msg)
    avatar.purge_later
  end

无论我上传什么，用户头像都会更新。如果验证失败，头像变为零，否则我得到我上传的内容。我试图通过 before_update 回调进行验证。没用。

Answer 1

似乎 ActiveStorage 目前不支持验证。根据https://github.com/rails/rails/issues/31656.

Answer 2

Active Storage 目前不支持验证，但 Rails 6.0 中将提供全面支持。在 6.0 发布之前，使用 Rails master，即 avoids storing files when validations fail.

Answer 3

试试Active Storage Validations gem

验证失败时如何防止主动存储更新模型？

How to prevent active storage updating model when validation fails?

ruby-on-rails

devise

rails-activestorage