Question

我一直在敲打这个。有人请给我打电话。

方案

我有以下型号

class House < ActiveRecord::Base
  has_one :tenancy, :dependent => :destroy, :as => :tenant
end

class LeaseAgreement < ActiveRecord::Base
  has_many :tenancies
end

class Tenancy < ActiveRecord::Base
  belongs_to :tenant, :polymorphic => true
  belongs_to :lease_agreement

  def lease=(lease)
    if lease.rent_amount > 10000
      # do something here
    else
      # do something else here
    end

    self.lease_agreement = lease
  end
end

我的工厂

Factory.define :lease_agreement do |l|
  l.name "Foo"
  l.rent_amount 5000
end

Factory.define :tenancy do |t|
  t.name "Foo"
  t.association :tenant, :factory => :house
  t.after_build { |tenancy| tenancy.lease = Factory.create(:lease_agreement) }
end

也试过这个

Factory.define :tenancy do |t|
  t.name "Foo"
  t.association :tenant, :factory => :house
  t.after_build { |tenancy| tenancy.lease = Factory.create(:lease_agreement, :tenant => tenancy) }
end

当我尝试这个时，我的规范测试中的两种方式; @house = Factory(:house)我收到以下错误

NoMethodError: undefined method `rent_amount' for nil:NilClass
from /home/kibet/.rvm/gems/ruby-1.8.7-p352/gems/activesupport-3.0.5/lib/active_support/whiny_nil.rb:48:in `method_missing'
from /home/kibet/code/ruby/stuff/app/models/tenancy.rb:44:in `lease='

我该怎么做？

Answer 1

它看起来像是一个操作顺序问题，我认为租约在评估你的after_build挂钩之前被设置为nil，其中lease是一个合法的LeaseAgreement实例。

您的代码无法处理传入的nil租约，如果要清除关联，则这是合法值。尝试像这样处理nil：

class Tenancy < ActiveRecord::Base
  belongs_to :tenant, :polymorphic => true
  belongs_to :lease_agreement

  def lease=(lease)
    if lease.present? && lease.rent_amount > 10000
      # do something here
    else
      # do something else here
    end

    self.lease_agreement = lease
  end
end

写入的代码将始终产生错误并传入nil租约。

Answer 2

我想如果你这样写你的工厂：

Factory.define :tenancy do |t|
  t.name "Foo"
  t.association :tenant, :factory => :house
  t.after_build { |tenancy| tenancy.lease = Factory.create(:lease_agreement) }
end

然后您的:lease_agreement将被正确创建，它应该可以正常工作。 tenancy没有lease_agreement。

工厂女孩与属性setter Error的多态关联

2 个答案: