如何在 rails 关联中包含来自联接 table 的列?

How can I include a column from a join table in a rails association?

我正在通过连接 table 连接两个模型,以便我可以在关系上设置状态:

class Test < ApplicationRecord
  has_many :products_tests
  has_many :products, through: :products_tests

  def products_with_status
    products_tests = ProductsTest.includes(:product).where(test_id: id)
    products_tests.map do |products_test|
      products_test.product.as_json.merge(status: products_test.status)
    end
  end

end

class Products < Application Record
  has_many :products_tests
  has_many :tests, through: :products_tests
end

class ProductsTest < ApplicationRecord
  belongs_to :product
  belongs_to :test
end

ProductTest 上有一个 status 列,让我为每个测试将产品从 "active" 切换到 "paused"。

当我使用来自 Testproducts 关联时,我想在 status 列中合并。我已经在上面一起破解 products_with_status 但想知道是否有更多 "Rails" 方法来做到这一点。

谢谢!

您可以添加新的has_many关联

has_many :products_with_status, -> { joins(:products_tests).select("DISTINCT products.*, products_tests.status") }, through: :products_tests, class_name: "Product", source: :product

那你可以做

Test.find(1).products_with_status.first.status