重定向到表单验证错误的路由别名 [英] redirect to a route alias on a form validation error

问题描述

如果我在一个路由别名，如/ register，我有一个表单错误，我渲染：新的，路径是可能的/注册仍然吗？

If I'm on a route alias such as /register and I have a form error and I render :new, is it possible for the path to be /register still?

此时它正在渲染/新

我可以做一个redirect_to register_path但是我会失去params？

I could do a redirect_to register_path but then I would lose the params?

这使得以下测试失败：

  Scenario: Try registering with a bad staff number
Given I am on the registration page
When I fill in "email" with "[e-mail]"
And I fill in "First Name" with "Kevin"
And I fill in "last name" with "Monk"
And I fill in "Employee Number" with "something barking123"
And I press "Register"
Then I should be on the registration page
And I should see "Your employee ID number looks incorrect."

推荐答案

另一种方法是设置两个路线。一个仅接受GET请求（并转到：新操作），另一个只接受POST请求（并转到创建操作，但呈现与新的相同的模板）。

An alternative would be to set up two "register" routes. One that accepts only GET requests (and goes to the :new action) and the other that accepts only POST requests (and goes to the create action, but renders the same template as for new).

这可能如下所示：

map.get_register 'register', :controller => :registrations, 
                 :action => :new, :conditions => { :method => :get }
map.post_register 'register', :controller => :registrations, 
                 :action => :create, :conditions => { :method => :post }

然后在您的控制器中：

def new
   @registration = Registration.new
   # renders the 'registrations/new' template
end
def create
   @registration = Registration.new(params[:registration])

   # render the 'registrations/new' template if we fail validation
   return render(:action => :new) unless @registration.save
   # otherwise renders the "create" template which is likely a thank-you
end

在这个问题上似乎有更多类似的事情：
在模型验证失败时使用自定义路线

There seems to be more in a similar vein on this question: Use custom route upon model validation failure

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