ruby-on-rails – 相同模型的AssociationTypeMismatch

我在我的应用程序中的不同位置出现此错误：

ActiveRecord::AssociationTypeMismatch in Settings::CompaniesController#show

Company(#70257861502120) expected,got Company(#70257861787700)

activerecord (3.2.11) lib/active_record/associations/association.rb:204:in `raise_on_type_mismatch'
activerecord (3.2.11) lib/active_record/associations/belongs_to_association.rb:6:in `replace'
activerecord (3.2.11) lib/active_record/associations/singular_association.rb:17:in `writer'
activerecord (3.2.11) lib/active_record/associations/builder/association.rb:51:in `block in define_writers'
activerecord (3.2.11) lib/active_record/attribute_assignment.rb:85:in `block in assign_attributes'
activerecord (3.2.11) lib/active_record/attribute_assignment.rb:78:in `each'
activerecord (3.2.11) lib/active_record/attribute_assignment.rb:78:in `assign_attributes'
activerecord (3.2.11) lib/active_record/base.rb:497:in `initialize'
app/controllers/settings/companies_controller.rb:4:in `new'
app/controllers/settings/companies_controller.rb:4:in `show'

调节器

控制器看起来像这样,但问题可能发生在公司模型用于保存或更新另一个模型的任何地方：

class Settings::CompaniesController < SettingsController
  def show
    @company = current_user.company
    @classification = Classification.new(company: @company)
  end

  def update
  end
end

事实/意见

一些事实和观察：

>问题随机发生,但通常在开发服务器运行一段时间后发生.
>生产中不会出现问题.
>即使我对公司模型没有任何改变,也会出现问题.
>通过重新启动服务器解决了该问题.

理论

据我所知,这是由于动态加载类.

不知何故,Company类在重新加载时获取新的类标识符.我听说有关它的谣言是由于草率的要求.我在公司模型中没有要求我自己,但我确实使用了active-record-postgres-hstore.

模特

这是公司型号：

class Company < ActiveRecord::Base
  serialize :preferences,ActiveRecord::Coders::Hstore
  DEFAULT_PREFERENCES = {
    require_review: false
  }
  has_many :users
  has_many :challenges
  has_many :ideas
  has_many :criteria
  has_many :classifications
  attr_accessible :contact_email,:contact_name,:contact_phone,:email,:logotype_id,:name,:phone,:classifications_attributes,:criteria_attributes,:preferences

  accepts_nested_attributes_for :criteria
  accepts_nested_attributes_for :classifications

  after_create :setup
  before_save :set_slug

  # Enables us to fetch the data from the preferences hash directly on the instance
  # Example:
  # company = Company.first
  # company.preferences[:foo] = "bar"
  # company.foo
  # > "bar"
  def method_missing(id,*args,&block)
    indifferent_prefs = HashWithIndifferentAccess.new(preferences)
    indifferent_defaults = HashWithIndifferentAccess.new(DEFAULT_PREFERENCES)
    if indifferent_prefs.has_key? id.to_s
      indifferent_prefs.fetch(id.to_s)
    elsif indifferent_defaults.has_key? id.to_s
      indifferent_defaults.fetch(id.to_s)
    else
      super
    end
  end

  private
  def setup
    DefaultClassification.find_each do |c|
      Classification.create_from_default(c,self)
    end

    DefaultCriterion.find_each do |c|
      Criterion.create_from_default(c,self)
    end
  end

  def set_slug
    self.slug = self.name.parameterize
  end
end

分类模型：

class Classification < ActiveRecord::Base
  attr_accessible :description,:company,:company_id
  has_many :ideas
  belongs_to :company

  def to_s
    name
  end
end

实际的问题

我真的很想知道为什么会出现这个问题,以及是否可以以某种方式避免它.

我知道这个例外在原则上意味着什么.我想知道如何避免它.

特别是,我想知道我是否以某种方式引起了问题,或者它是否是宝石,在这种情况下,如果我能以任何方式帮助修复宝石.

提前感谢您的任何答案.