Ruby-on-rails Rails - 在 link_to 中传递参数
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Rails - passing parameters in link_to
提问by bdx
My Accounts index page lists all accounts, and per account has a link to "+ Service"; this should direct the user to the /my_services/new page and have pre-populated the account_id field with the appropriate ID, depending on which link was clicked on the Accounts index page.
我的账户索引页面列出了所有账户，每个账户都有一个“+服务”链接；这应该将用户引导至 /my_services/new 页面，并使用适当的 ID 预先填充 account_id 字段，具体取决于在 Accounts index 页面上单击的链接。
I have debug(params) at the bottom of every page, and with what I'm trying, I'm not getting anything other than :controller and :action showing up in my parameters for the /my_services/new page.
我在每个页面的底部都有 debug(params) ，并且通过我正在尝试的内容，除了 :controller 和 :action 显示在我的 /my_services/new 页面的参数中之外，我没有得到任何其他信息。
The link I've been trying is this:
我一直在尝试的链接是这样的：
link_to "+ Service", "my_services/new", :account_id => acct.id
I then also have logic in the services controller:
然后我在服务控制器中也有逻辑：
def new
@my_service = MyService.new
if params[:account_id]
@my_service.account_id = params[:account_id]
end
end
Can someone help with the proper way of doing this? I haven't yet been able to get it going with with a few nasty little hacky things I tried.
有人可以帮助正确地做到这一点吗？我还没有能够用我尝试过的一些讨厌的小东西来让它继续下去。
EDIT
编辑
Turns out, if someone is looking at this answer in future, nested resources (possibly with the shallow: trueoption in routes.rb) seem to be the way to go. My routes.rb for this part now looks like this:
事实证明，如果将来有人在看这个答案，嵌套资源（可能带有shallow: trueroutes.rb 中的选项）似乎是要走的路。我这部分的 routes.rb 现在看起来像这样：
resources :accounts, shallow: true do
resources :services
end
My links now look like this:
我的链接现在看起来像这样：
<%= link_to "+ Service", new_service_path(:service => { :account_id => @account.id } ) %>
回答by Viktor Trón
First of all, link_to is a html tag helper, its second argument is the url, followed by html_options. What you would like is to pass account_id as a url parameter to the path. If you have set up named routes correctly in routes.rb, you can use path helpers.
首先，link_to 是一个 html 标签助手，它的第二个参数是 url，其次是 html_options。您想要的是将 account_id 作为 url 参数传递给路径。如果您在 routes.rb 中正确设置了命名路由，则可以使用路径助手。
link_to "+ Service", new_my_service_path(:account_id => acct.id)
I think the best practice is to pass model values as a param nested within :
我认为最好的做法是将模型值作为嵌套在 param 中传递：
link_to "+ Service", new_my_service_path(:my_service => { :account_id => acct.id })
# my_services_controller.rb
def new
@my_service = MyService.new(params[:my_service])
end
And you need to control that account_id is allowed for 'mass assignment'. In rails 3 you can use powerful controls to filter valid params within the controller where it belongs. I highly recommend.
并且您需要控制允许“批量分配”的 account_id。在 rails 3 中，您可以使用强大的控件来过滤其所属控制器内的有效参数。我强烈推荐。
http://apidock.com/rails/ActiveModel/MassAssignmentSecurity/ClassMethods
http://apidock.com/rails/ActiveModel/MassAssignmentSecurity/ClassMethods
Also note that if account_id is not freely set by the user (e.g., a user can only submit a service for the own single account_id, then it is better practice not to send it via the request, but set it within the controller by adding something like:
还要注意，如果 account_id 不是用户自由设置的（例如，用户只能为自己的单个 account_id 提交服务，那么最好不要通过请求发送它，而是通过添加一些东西在控制器中设置它喜欢：
@my_service.account_id = current_user.account_id
You can surely combine the two if you only allow users to create service on their own account, but allow admin to create anyone's by using roles in attr_accessible.
如果您只允许用户在他们自己的帐户上创建服务，但允许管理员使用 attr_accessible 中的角色创建任何人的服务，那么您肯定可以将两者结合起来。
hope this helps
希望这可以帮助
回答by abhas
Try this
尝试这个
link_to "+ Service", my_services_new_path(:account_id => acct.id)
it will pass the account_id as you want.
它会根据需要传递 account_id 。
For more details on link_to use this http://api.rubyonrails.org/classes/ActionView/Helpers/UrlHelper.html#method-i-link_to
有关 link_to 的更多详细信息，请使用此http://api.rubyonrails.org/classes/ActionView/Helpers/UrlHelper.html#method-i-link_to
回答by Vish
link_to "+ Service", controller_action_path(:account_id => acct.id)
If it is still not working check the path:
如果仍然无法正常工作，请检查路径：
$ rake routes
