为什么Capybara不会在选择菜单中选择正确的项目？

Question

当您save_and_open_page时，您可以看到我的表单包含：

<label class="select optional control-label" for="assignment_role_id">Role</label>
  <select class="select optional" id="assignment_role_id" name="assignment[role_id]">
    <option value="819">admin</option>
    <option value="820">customer</option>
</select>

为什么Capybara会在下拉菜单中选择正确的项目？我明白了：

Failure/Error: select("customer", :from => :Role)
     Capybara::ElementNotFound:
       cannot select option, no option with text 'customer' in select box 'Role'

...和...

Failure/Error: select("customer", :from => :assignment_role_id)
     Capybara::ElementNotFound:
       cannot select option, no option with text 'customer' in select box 'assignment_role_id'

...和...

Failure/Error: select("customer", :from => :role_id)
     Capybara::ElementNotFound:
       cannot select option, no option with text 'customer' in select box 'role_id'

Answer 1

解决方案是：

select("customer", :from => "assignment[role_id]")