未定义的方法“add”在黄瓜步骤上通常有效

我定义了一条路径:

when /the admin home\s?page/
  "/admin/"

我有一个假设:

  Scenario: Let admins see the admin homepage
    Given "pojo" is logged in
    And "pojo" is an "admin"
    And I am on the admin home page
    Then I should see "Hi there."

我有一个失败的场景:

  Scenario: Review flagged photo
    Given "pojo" is logged in
    And "pojo" is an "admin"
  ...bunch of steps that create stuff in the database...
    And I am on the admin home page
    Then ... the rest of the steps

在第二个场景中失败的步骤是“我在管理主页上”,这在第一个场景中通过得很好。

我得到的错误是:

And I am on the admin home page                 # features/step_definitions/web_steps.rb:18
  undefined method `add' for {}:Hash (NoMethodError)
  ./app/controllers/admin_controller.rb:13:in `index'
  ./app/controllers/admin_controller.rb:11:in `each'
  ./app/controllers/admin_controller.rb:11:in `index'
  /usr/lib/ruby/1.8/benchmark.rb:308:in `realtime'
  ./features/step_definitions/web_steps.rb:19:in `/^(?:|I )am on (.+)$/'
  features/admin.feature:52:in `And I am on the admin home page'

这很奇怪…为什么在第一种情况下是可以的,而在第二种情况下就不行了,因为只有一堆步骤在数据库中创建记录了?

[编辑]

下面是向数据库添加内容步骤:

Given /^there is a "([^\"]*)" with the following:$/ do |model, table|
  model.constantize.create!(table.rows_hash)
end