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好的,我开始用 has_many 编写这个需要帮助的内容:通过多个数据库并且仍然可以,但是我发现了一些奇怪的东西,也许我遗漏了一些东西。

所以我在做什么:

我有

导轨 3.2

1 个称为部署的 MSSQL DB 表

1 个称为报告的 POSTGRESQL DB 表

带有用于加入称为关联的 POSTGRESQL DB 表

class Deployment < ActiveRecord::Base
  self.primary_key = :id
  establish_connection "deploy"
  self.abstract_class = true
  self.table_name = 'deployments'

  has_many :associations
  has_many :reports, through: :associations

end

class Report < ActiveRecord::Base
  self.primary_key = :id 
  belongs_to :user
  has_many :comments, dependent: :destroy

  has_many :associations
  has_many :deployments, through: :associations

  accepts_nested_attributes_for :comments, allow_destroy: true
  validates :weekending, presence: true, uniqueness: true
end

class Association < ActiveRecord::Base
  attr_accessible :deployment_id, :report_id
  belongs_to :deployment
  belongs_to :report
end

关联的创建工作正常,我在表中填充了两个 ID,但是当我尝试获取数据时,我得到以下信息:

report = Report.find(16)

report.deployments

!! #<ActiveRecord::StatementInvalid: TinyTds::Error: Invalid object name 'associations'.: EXEC sp_executesql N'SELECT [deployments].* FROM [deployments] INNER JOIN [associations] ON [deployments].[id] = [associations].[deployment_id] WHERE [associations].[report_id] = 16'>

但这就是我觉得奇怪的地方,如果我反过来这样做:

deployment = Deployment.find('0004d1bf-c49f-4310-85cd-222806d2eb78')

deployment.reports
[#<Report id: 15, weekending: "2019-01-17", visible: true, user_id: 5, news: "asdf", created_at: "2014-05-14 02:15:05", updated_at: "2014-05-14 02:15:05">]

这是我所期望的,所以有人告诉我为什么它不能以另一种方式工作?

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1 回答 1

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由于这是一个错误,我在您的代码中看到的是 report.deployment 它应该是

repost.deployments

所以在模型中

has_many deployments
于 2014-05-24T05:46:08.513 回答