ruby-on-rails - Rails - モデルの関連付け - ユーザーと製品 - カスタムメソッド

Question

ユーザーと製品の2つの主要なモデルを持つアプリを作成しています。ユーザーは多くの製品を所有者として持つことができ、多くの製品を借用者として持つことができます。製品の所有者は 1 人だけですが、借用者を含む多くのシーカーを持つことができます。所有プロパティには直接関連付けましたが、借用プロパティにはトランザクションモデルを作成しました。3つは次のようになります。

アプリ/モデル/transaction.rb

class Transaction
# has a seeker_id:integer, a product_id:integer and a current:boolean

  before_save :check_current

# Associations
  belongs_to :seeker, class_name: "User", foreign_key: "seeker_id"
  belongs_to :product

# Methods
    def check_current
      if !self.borrowing_date.nil? && self.return_date.nil?
        self.current = true
      end
    end

end

商品にはたくさんtransactionsのがありますが、一度に借りられるのは 1 つだけseekerです。製品が借りられるとき、トランザクションにはがborrowing_dateありnot nil、return_dateがですnil。次に、check_currentメソッドcurrentは this のブール値をtransactionからfalseに切り替えtrueます。そのseeker電流のtransactionはとして指定されますborrower。

アプリ/モデル/user.rb

class User
    .
    .
    .
  has_many :owned_products, class_name: "Product", foreign_key: "owner_id", dependent: :destroy
  has_many :transactions, foreign_key: "seeker_id", dependend: :destroy
  has_many :requested_products, through: :transactions, source: :product
  has_many :active_transactions, -> { where current: true },
                                 class_name: 'Transaction',
                                 foreign_key: "seeker_id",
                                 dependent: :destroy

  has_many :borrowed_products, through: :active_transactions,
                               source: :product

    def requesting?(product)
      self.transactions.find_by(product_id: product.id)
    end

    def request!(product)
      self.transactions.create!(product_id: product.id)
    end

    def borrowing?(product)
      self.transactions.find_by(product_id: product.id, current: true)
    end  

    def borrowed_products
      self.transactions.where(current: :true).product
    end



end

アプリ/モデル/products.rb

class Product
    .
    .
    .
  belongs_to :owner, class_name: "User", foreign_key: "owner_id"
  has_many :transactions, dependent: :destroy
  has_many :seekers, through: :transactions,
                       source: :seeker



    def borrowed?
      self.transactions.find_by(current: true)
    end

    def borrower
      self.transactions.find_by(current: true).seeker
    end
end

コードの一部をテストすると、同じタイプの 5 つのテストが失敗し、理由がわかりません。

describe User do

  before { @user = User.new(name: "Utilisateur de test",
                            email: "test@utilisateur.com",
                            password: "motdepasse",
                            password_confirmation: "motdepasse") }

  subject { @user }


  describe "requested product associations" do

    let(:lender) { FactoryGirl.create(:user) }
    let(:product) { FactoryGirl.create(:product, owner: lender) }
    before do
      @user.save
      @user.request!(product)
    end

    it { should be_requesting(product) }
    its(:requested_products) { should include(product) } # FAIL

    describe "when product is borrowed" do

      before do
        transaction = Transaction.find_by(product: product)
        transaction.update_attributes(borrowing_date: 1.day.ago)
        transaction.save
      end

      it { should be_borrowing(product) }
      its(:requested_products) { should_not include(product) } # FAIL
      its(:borrowed_products) { should include(product) } # FAIL


      describe "then returned" do

        before do
          transaction = Transaction.find_by(product: product)
          transaction.update_attributes(return_date: 1.hour.ago)
        end

        it { should_not be_borrowing(product) }
        its(:requested_products) { should_not include(product) } # FAIL
        its(:borrowed_products) { should_not include(product) } # FAIL
      end
    end
  end
end

エラーメッセージは次のとおりです。

1) User requested product associations requested_products 
   Failure/Error: its(:requested_products) { should include(product) }
   ActiveRecord::StatementInvalid:
     SQLite3::SQLException: ambiguous column name: created_at: SELECT  1 AS one FROM "products" INNER JOIN "transactions" ON "products"."id" = "transactions"."product_id" WHERE "transactions"."seeker_id" = ? AND "products"."id" = 1  ORDER BY created_at DESC LIMIT 1
   # ./spec/models/user_spec.rb:174:in `block (3 levels) in <top (required)>'

2) User requested product associations when product has been borrowed borrowed_products 
   Failure/Error: its(:borrowed_products) { should include(product) }
   ActiveRecord::StatementInvalid:
     SQLite3::SQLException: ambiguous column name: created_at: SELECT  1 AS one FROM "products" INNER JOIN "transactions" ON "products"."id" = "transactions"."product_id" WHERE "transactions"."seeker_id" = ? AND "transactions"."current" = 't' AND "products"."id" = 1  ORDER BY created_at DESC LIMIT 1
   # ./spec/models/user_spec.rb:185:in `block (4 levels) in <top (required)>'

3) User requested product associations when product has been borrowed requested_products 
   Failure/Error: its(:requested_products) { should_not include(product) }
   ActiveRecord::StatementInvalid:
     SQLite3::SQLException: ambiguous column name: created_at: SELECT  1 AS one FROM "products" INNER JOIN "transactions" ON "products"."id" = "transactions"."product_id" WHERE "transactions"."seeker_id" = ? AND "products"."id" = 1  ORDER BY created_at DESC LIMIT 1
   # ./spec/models/user_spec.rb:184:in `block (4 levels) in <top (required)>'

4) User requested product associations when product has been borrowed then returned requested_products 
   Failure/Error: its(:requested_products) { should_not include(product) }
   ActiveRecord::StatementInvalid:
     SQLite3::SQLException: ambiguous column name: created_at: SELECT  1 AS one FROM "products" INNER JOIN "transactions" ON "products"."id" = "transactions"."product_id" WHERE "transactions"."seeker_id" = ? AND "products"."id" = 1  ORDER BY created_at DESC LIMIT 1
   # ./spec/models/user_spec.rb:195:in `block (5 levels) in <top (required)>'

5) User requested product associations when product has been borrowed then returned borrowed_products 
   Failure/Error: its(:borrowed_products) { should_not include(product) }
   ActiveRecord::StatementInvalid:
     SQLite3::SQLException: ambiguous column name: created_at: SELECT  1 AS one FROM "products" INNER JOIN "transactions" ON "products"."id" = "transactions"."product_id" WHERE "transactions"."seeker_id" = ? AND "transactions"."current" = 't' AND "products"."id" = 1  ORDER BY created_at DESC LIMIT 1
   # ./spec/models/user_spec.rb:196:in `block (5 levels) in <top (required)>'

しかし、Rails コンソールでいくつかのテストを手動で実行すると、user.borrowed_productsとはuser.requested_products問題なく動作します。変？？？

ruby-on-rails - Rails - モデルの関連付け - ユーザーと製品 - カスタム メソッド

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ruby-on-rails - Rails - モデルの関連付け - ユーザーと製品 - カスタムメソッド