导入记录时 rails 中的反向有效性错误

Question

我在使用 sidekiq 导入记录时遇到错误 ActiveRecord::InverseOfAssociationNotFoundError (Could not find the inverse association for sponsorships (:sponsor_type in LegiscanModel::Sponsorship)。以下是我的模型。

sponsorship.rb

class LegiscanModel::Sponsorship < ApplicationRecord
  belongs_to :bill, class_name: 'LegiscanModel::Bill', foreign_key: 'bill_id', inverse_of: :sponsorships

  belongs_to :sponsor, class_name: 'LegiscanModel::Politician', foreign_key: :politician_id, inverse_of: :sponsorships
  accepts_nested_attributes_for :sponsor
  delegate :full_name, to: :sponsor, prefix: true, allow_nil: true

  validates :politician_id, uniqueness: { scope: :bill }

  belongs_to :sponsorship_type, class_name: 'LegiscanModel::SponsorType', foreign_key: :sponsor_type_id, inverse_of: :sponsorships
end

sponsor_type.rb

class LegiscanModel::SponsorType < ApplicationRecord
  has_many :sponsorships, class_name: 'LegiscanModel::Sponsorship', inverse_of: :sponsor_type, dependent: :destroy
end

politician.rb

has_many :sponsorships, dependent: :destroy, inverse_of: :sponsor, class_name: 'LegiscanModel::Sponsorship'

sidekiq 作业（部分）

  def handle_sponsors(sponsors, bill_id)
    sponsors.each do |sponsor|
      LegiscanModel::Politician.find_by(people_id: sponsor['people_id']).tap do |politician|
        LegiscanModel::Sponsorship.find_or_create_by!(politician_id: politician.id, bill_id: bill_id, sponsor_order: sponsor['sponsor_order'], sponsor_type_id: sponsor['sponsor_type_id'])
      end
    end
  end

Answer 1

如果您实际上通过显式嵌套正确设置了类而不是使用范围解析运算符，则可以显着改进此代码：

module LegiscanModel
  class Sponsorship < ApplicationRecord
    belongs_to :bill
    belongs_to :sponsor, 
       class_name: 'Politician', # specifying the module is optional
       inverse_of: :sponsorships
    belongs_to :sponsorship_type

    accepts_nested_attributes_for :sponsor
    delegate :full_name, to: :sponsor, prefix: true, allow_nil: true
    # should be the database column since its used to create a query
    validates :politician_id, uniqueness: { scope: :bill_id } 
  end
end

module LegiscanModel
  class SponsorshipType < ApplicationRecord
    has_many :sponsorships, dependent: :destroy
  end
end

虽然这看起来像是一个微不足道的风格选择，但实际上并非如此 - 通过使用 module LegiscanModel 您将重新打开模块并设置模块嵌套，以便您可以引用同一命名空间中的常量。

这也避免了由于不断查找而导致的自动加载错误和错误。 :: 只应在引用常量时使用 - 而不是在定义常量时使用。

当可以从关联名称派生时，您也不需要指定外键选项。虽然它没有任何危害，但它会产生额外的噪音。 Rails 也可以自动推断逆。如果你想通过关联反射，你可以检查它：

LegiscanModel::Sponsorship.reflect_on_assocation(:sponsorship_type)
                          .inverse

导入记录时 rails 中的反向有效性错误

Inverse validity error in rails when importing records

ruby

activerecord

ruby-on-rails

inverse-relationship

sponsorship.rb

sponsor_type.rb

politician.rb

sidekiq 作业（部分）