多个 Angular 请求在测试中导致错误

Question

我有一个 Angular 1.5 应用程序，后端是 Rails 4.0同时。在测试中（使用 Capybara + selenium + chromeheadless）这会导致这些请求导致后端错误。在开发中它工作正常。

错误示例；

NoMethodError at /entities/get_current_entity
=============================================

> undefined method `fields' for nil:NilClass

app/controllers/application_controller.rb, line 79
--------------------------------------------------

``` ruby
   74   
   75     private
   76   
   77     def set_locale
   78       #I18n.locale = params[:locale] if params[:locale].present?
>  79       if current_staff.nil? or current_staff.locale.nil?
   80         I18n.locale = "en"
   81       else
   82         I18n.locale = current_staff.locale
   83       end
   84     end
```

App backtrace
-------------

 - app/controllers/application_controller.rb:79:in `set_locale'
<Snip>

未通过的测试

require "rails_helper"

RSpec.describe "Login", :type => :feature do
  describe "login with existing staff member" do
    before do 
      create_admin
    end

    it "logs in as admin" do
      visit "#/login"
      fill_in "Email", with: "admin@test.com.au"
      fill_in "Password", with: "password"
      click_button "Login"

      within "#staff-status" do
        expect(page).to have_text('LOGOUT')    
      end

      within("#flash-messages") do 
        expect(page).to have_text('Successful login')
      end

      # Check session variables
      within("#selected-entity") do 
        expect(page).to have_text("LOGIN DEFAULT COMPANY")
      end

      within("#selected-ledger") do 
        expect(page).to have_text("My Ledger")
      end

      within("#selected-division") do 
        expect(page).to have_text("1-General")
      end
    end
  end
end

这是导致挂起调用的代码

  $scope.$on('devise:new-session', (event, currentStaff) ->
    # staff logged in by Auth.login({...})
    Auth.currentUser().then((staff) ->
      FirmService.current_entity($rootScope)
      DivisionService.current_division($rootScope)
      LedgerService.current_ledger($rootScope)

      $rootScope.current_staff = staff
    , (error) ->
      console.log("fail")
    )

    $location.path "/dashboard"
  )

这在整个应用程序中都会发生，而在 Rails 3.2 上不会发生。只是因为我正在升级到 Rails 4 才开始发生这种情况。

如果我使用 promises 那么这个问题就不会发生。我不能总是使用 promises 来获取数据，这也会降低应用程序的速度。

这是登录的解决方法；

Auth.currentUser().then((staff) ->
  FirmService.current_entity($rootScope).then ->
    DivisionService.current_division($rootScope).then ->
      LedgerService.current_ledger($rootScope)

如何让 Rails 4 在测试模式下处理这样的多个请求？

更新：运行服务器在测试环境

我运行我在测试环境中的服务器尝试手动复制问题，但这样做时它起作用了。所以一定和测试的速度或者水豚本身有关系吧？

更新：更新宝石

我更新到水豚 2.15.2、selenium-webdriver 3.6.0 和 chromedriver-helper 1.1.0。这没有帮助。

更新：错误

有时错误会改变，即使用户已成功登录，我的一个请求也会出现错误 'Staff not logged in'。

更新：调试

将 'require "pry";binding.pry' 插入到 Rails 控制器中，AngularJS 调用最终无法按预期工作。我在 AngularJS 代码中有三个调用，我希望 Rails 会命中调试行 3 次。第一次我运行它只命中其中一条调试线，第二次它没有命中任何调试线。相反，我在 /entities/get_current_entity 处得到了 NoMethodError 并且对于部门和分类帐也是如此。

更新：调查撬挂

如果我将 binding.pry 放入 set_locale 方法并调用 current_staff.locale.nil？我发现有时 pry 会 hang 永远在那里。

注释掉 set_locale 内容后，它继续运行但仍然失败，在 test.log 文件中我得到这些错误；

Completed 500 Internal Server Error in 4690ms
Completed 500 Internal Server Error in 4688ms
Completed 500 Internal Server Error in 4686ms

NoMethodError - undefined method `fields' for nil:NilClass:
<snip>
NoMethodError - undefined method `fields' for nil:NilClass:
<snip>
NoMethodError - undefined method `collect' for nil:NilClass:
<snip>
(1.3ms)  ALTER TABLE "indirect_taxes" DISABLE TRIGGER ALL;ALTER TABLE "ledger_defaults" DISABLE TRIGGER ALL;ALTER TABLE "ledgers" DISABLE TRIGGER ALL;ALTER TABLE "levels" DISABLE TRIGGER ALL;ALTER TABLE "locations" DISABLE TRIGGER ALL;ALTER TABLE "phones" DISABLE TRIGGER ALL;ALTER TABLE "sessions" DISABLE TRIGGER ALL;ALTER TABLE "transactions" DISABLE TRIGGER ALL;ALTER TABLE "versions" DISABLE TRIGGER ALL;ALTER TABLE "schema_migrations" DISABLE TRIGGER ALL;ALTER TABLE "staff" DISABLE TRIGGER ALL;ALTER TABLE "tickets" DISABLE TRIGGER ALL;ALTER TABLE "timesheets" DISABLE TRIGGER ALL;ALTER TABLE "websites" DISABLE TRIGGER ALL;ALTER TABLE "customers" DISABLE TRIGGER ALL;ALTER TABLE "costings" DISABLE TRIGGER ALL;ALTER TABLE "disbursements" DISABLE TRIGGER ALL;ALTER TABLE "employees" DISABLE TRIGGER ALL;ALTER TABLE "entities" DISABLE TRIGGER ALL;ALTER TABLE "folios" DISABLE TRIGGER ALL;ALTER TABLE "work_descs" DISABLE TRIGGER ALL;ALTER TABLE "account_groups" DISABLE TRIGGER ALL;ALTER TABLE "accounts" DISABLE TRIGGER ALL;ALTER TABLE "addresses" DISABLE TRIGGER ALL;ALTER TABLE "business_types" DISABLE TRIGGER ALL;ALTER TABLE "charges" DISABLE TRIGGER ALL;ALTER TABLE "comments" DISABLE TRIGGER ALL;ALTER TABLE "invoices" DISABLE TRIGGER ALL;ALTER TABLE "jobs" DISABLE TRIGGER ALL;ALTER TABLE "divisions" DISABLE TRIGGER ALL;ALTER TABLE "emails" DISABLE TRIGGER ALL
   (411.5ms)  TRUNCATE TABLE "public"."indirect_taxes", "public"."ledger_defaults", "public"."ledgers", "public"."levels", "public"."locations", "public"."phones", "public"."sessions", "public"."transactions", "public"."versions", "public"."staff", "public"."tickets", "public"."timesheets", "public"."websites", "public"."customers", "public"."costings", "public"."disbursements", "public"."employees", "public"."entities", "public"."folios", "public"."work_descs", "public"."account_groups", "public"."accounts", "public"."addresses", "public"."business_types", "public"."charges", "public"."comments", "public"."invoices", "public"."jobs", "public"."divisions", "public"."emails" RESTART IDENTITY CASCADE;
   (1.9ms)  ALTER TABLE "indirect_taxes" ENABLE TRIGGER ALL;ALTER TABLE "ledger_defaults" ENABLE TRIGGER ALL;ALTER TABLE "ledgers" ENABLE TRIGGER ALL;ALTER TABLE "levels" ENABLE TRIGGER ALL;ALTER TABLE "locations" ENABLE TRIGGER ALL;ALTER TABLE "phones" ENABLE TRIGGER ALL;ALTER TABLE "sessions" ENABLE TRIGGER ALL;ALTER TABLE "transactions" ENABLE TRIGGER ALL;ALTER TABLE "versions" ENABLE TRIGGER ALL;ALTER TABLE "staff" ENABLE TRIGGER ALL;ALTER TABLE "tickets" ENABLE TRIGGER ALL;ALTER TABLE "timesheets" ENABLE TRIGGER ALL;ALTER TABLE "schema_migrations" ENABLE TRIGGER ALL;ALTER TABLE "websites" ENABLE TRIGGER ALL;ALTER TABLE "customers" ENABLE TRIGGER ALL;ALTER TABLE "costings" ENABLE TRIGGER ALL;ALTER TABLE "disbursements" ENABLE TRIGGER ALL;ALTER TABLE "employees" ENABLE TRIGGER ALL;ALTER TABLE "entities" ENABLE TRIGGER ALL;ALTER TABLE "folios" ENABLE TRIGGER ALL;ALTER TABLE "work_descs" ENABLE TRIGGER ALL;ALTER TABLE "account_groups" ENABLE TRIGGER ALL;ALTER TABLE "accounts" ENABLE TRIGGER ALL;ALTER TABLE "addresses" ENABLE TRIGGER ALL;ALTER TABLE "business_types" ENABLE TRIGGER ALL;ALTER TABLE "charges" ENABLE TRIGGER ALL;ALTER TABLE "comments" ENABLE TRIGGER ALL;ALTER TABLE "invoices" ENABLE TRIGGER ALL;ALTER TABLE "jobs" ENABLE TRIGGER ALL;ALTER TABLE "divisions" ENABLE TRIGGER ALL;ALTER TABLE "emails" ENABLE TRIGGER ALL

我认为 Truncate table 的最后一点是试图清理混乱的数据库清理器。所以我得到的那三个服务器错误似乎超时了。为什么数据库 / Rails 会停止监听查询？

当我输入一个简单的查询时，pry 也会挂在 set_locale 方法中

Staff.all

更新：strace 输出

我已经获取了 pry 挂起时的 strace 输出； https://gist.github.com/map7/f25f75457f1a6ae6995934e2c2744660

Answer 1

经过一番交谈，发现使用了一个在多个线程之间共享数据库连接的补丁。问题是，这可能会导致多个同时请求的各种问题，并且通常会导致测试中的潜在漏洞。删除补丁修复了测试。

一旦您一直迁移到 Rails 5.1，然后 Rails 会通过互斥体处理测试环境中的连接共享，允许事务性功能测试，并避免需要database_cleaner

多个 Angular 请求在测试中导致错误

Multiple Angular requests cause errors within tests

testing

selenium

ruby-on-rails

capybara

angularjs