ruby-on-rails – 如何在不调用依赖的情况下销毁Rails模型::关联

发布时间：2020-12-17 01:48:06 所属栏目：百科来源：网络整理

导读：有没有办法破坏Rails模型而不调用依赖的回调::关联中的destroy. 例： class Administration ActiveRecord::Base include IdentityCache attr_accessible :auto_sync,:response_rate_calc_state,:description,:year,:project_id,:season,:auto_async,:synchro

有没有办法破坏Rails模型而不调用依赖的回调::关联中的destroy.

例：

class Administration < ActiveRecord::Base
  include IdentityCache

  attr_accessible :auto_sync,:response_rate_calc_state,:description,:year,:project_id,:season,:auto_async,:synchronized_at

  has_many :report_distributions 
  has_many :rosters,dependent: :destroy

  before_destroy :delete_file

  attr_accessible :file

  has_attached_file :file,path: ":class/:id_partition/:basename.:extension",storage: :s3,bucket: S3Config::AWS_BUCKET_MODELS,s3_credentials: {
          access_key_id: S3Config::AWS_ACCESS_KEY_ID_MODELS,secret_access_key: S3Config::AWS_SECRET_ACCESS_KEY_MODELS
      },s3_permissions: 'authenticated-read',s3_protocol: 'https',s3_storage_class: :reduced_redundancy

  def authenticated_url(style = nil,expires_in = 10.seconds)
    file.s3_object(style).url_for(:read,secure: true,expires: expires_in).to_s
  end

  def delete_file
    file.s3_object(nil).delete if self.file?
  end

# ...

所以我打电话的时候

Administration.find(id).destroy

我想删除记录和附件文件,但不要调用回调来删除名单

has_many :rosters,dependent: :destroy

–

PS我不想禁用has_many：rosters,dependent :: destroy.我只需要临时禁用回调.

解决方法

您可以按原样保持关联,并跳过以下方法之一的回调：

1.使用delete而不是destroy,因为它是won’t fire callbacks

Administration.find(id).delete

2.使用skip_callback方法(在blog post中找到)：

Administration.skip_callback(:destroy,:bofore,:action_you_need_to_disable)
 #then safely destroy without firing the action_you_need_to_disable callback
 Administration.find(id).destroy

3.或者甚至更好,如果您已经知道何时需要跳过回调,您可以：

class Admistration < ActiveRecord::Base
  has_many :rosters,dependent: :destroy
  skip_callback :destroy,:before,:action_you_need_to_disable,if: -> { #conditions }
end

链接：api docs on skip_callback

（编辑：李大同）

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