Rails_admin 有很多 through 正在删除两个 :through 模态

Question

我有 campaign、campaign_commissions、applicant 和 applicant_commissions 模态。

campaign_commissions 都是 commissions 可用于 campaign 和 applicant_commissions 是 applicants 实例那些 commissions。

当我删除一个应聘者时，rails_admin也想同时删除campaign_commissions和applicant_commissions。我只希望 applicant_commissions 被销毁。

如何指定发生这种情况？

我的模特： applicant.rb

class Applicant < ActiveRecord::Base

  enum hired:  [:pending, :declined, :awaiting_post, :accepted]
  attr_accessor :post_url


  belongs_to :post
  belongs_to :campaign
  belongs_to :site

  has_many :applicant_commissions
  accepts_nested_attributes_for :applicant_commissions
  has_many :campaign_commissions, through: :applicant_commissions


  scope :accepted, -> { where('hired == ?', 3) }
  scope :declined, -> { where('hired < ?', 1) }
  scope :pending, -> { where('hired < ?', 0) }
  scope :awaiting_post, -> { where('hired < ?', 2) }

  validates :campaign_id, :presence => true
  #validates :site_id, :presence => true
  validates :applicant_commissions, :presence => true

  validates :campaign_id, uniqueness: { scope: :site_id,
                                        message: "We already have an application from you" }

applicant_commission.rb

    class ApplicantCommission < ActiveRecord::Base
      include ActionView::Helpers::NumberHelper

      belongs_to :applicant
      belongs_to :campaign_commission

      has_many :invoice_parts
      #delegate :user, to: applicant
end

campaign_commission.rb

class CampaignCommission < ActiveRecord::Base

  belongs_to :campaign
  belongs_to :commission

  has_many :applicant_commissions
  has_many :applicants, through: :applicant_commissions

end

campaign.rb（未涉及问题，为上下文添加）

class Campaign < ActiveRecord::Base

  has_attached_file :image, :styles => { :default => "500x500>", :thumb => "100x100>" }, :default_url => "/images/:style/missing.png"
  validates_attachment_content_type :image, :content_type => /\Aimage\/.*\Z/

  belongs_to :programme
  belongs_to :user
  has_many :applicants



  has_many :campaign_commissions
  has_many :commissions, through: :campaign_commissions

  has_many :images, as: :imageable

  scope :front, -> { limit(4) }

end

Answer 1

applicant_commissions 通过这种关系获得活动佣金。

has_many :campaign_commissions, through: :applicant_commissions

我建议用这个来解决你提出的问题。

has_many :campaign_commissions

而且，我没有在您的示例模型中看到它，但为了答案的完整性，我将其包含在此处。如果不包含 destroy 属性，依赖记录（或关联依赖）将不会被删除。

 has_many :applicant_commissions, :dependent => :destroy

我不认为你可以通过两种方式拥有 has many through 关系，就像在申请期间一样运行但是当你想删除父记录时暂停关系。但也许有人会给出答案和方法。

Rails_admin 有很多 through 正在删除两个 :through 模态

Rails_admin has many through is deleting both :through modals

ruby-on-rails

ruby-on-rails-4

has-many-through

rails-admin