Ruby-on-rails rails - 在 link_to 上传递 id 参数
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rails - Pass id parameter on a link_to
提问by ChrisWesAllen
I'm trying to pass the parameter of the current page(id) to the next page so I can create a dependent model entry.
我正在尝试将当前页面（id）的参数传递到下一页，以便我可以创建一个依赖模型条目。
i.e. Projects have bids, bids belong to projects.
即项目有投标，投标属于项目。
So on the show page for a project I added the link
所以在项目的展示页面上，我添加了链接
<%= link_to "New Bid", new_bid_path(@project) %>
Which creates and performs the url.... "http://localhost:3000/bids/new.2"
它创建并执行 url .... "http://localhost:3000/bids/new.2"
I have
我有
def new
@bid = Bid.new
@project = Project.find(params[:id])
end
in the bids controller but I keep getting the error "Couldn't find Project without an ID"
在出价控制器中，但我不断收到错误“无法找到没有 ID 的项目”
???
？？？
Whats going on, how come I can't pass the id?
怎么回事，我怎么传不了id？
回答by BitOfUniverse
If your bids are not nested resource of the project, then you can add project_id as parameter to the path:
如果您的投标不是项目的嵌套资源，那么您可以将 project_id 作为参数添加到路径中：
<%= link_to "New Bid", new_bid_path(:project => @project.id) %>
<%= link_to "New Bid", new_bid_path(:project => @project.id) %>
def new
@bid = Bid.new
@project = Project.find(params[:project])
end
otherwise:
除此以外：
#routes.rb
map.resources :projects do |project|
project.resources :bids
end
<%= link_to "New Bid", new_project_bid_path(@project) %>
<%= link_to "New Bid", new_project_bid_path(@project) %>
def new
@project = Project.find(params[:project_id])
@bid = @project.bids.build
end
回答by Gareve
A good approach to this kind of problems, its to see what are you sending with the params. This can be done with debug.
解决这类问题的一个好方法，就是看看你用参数发送了什么。这可以通过调试来完成。
<%= debug params # or any variable%>
With that information you will see (and learn) what kind of params are you sending to a controller.
有了这些信息，您将看到（并了解）您发送给控制器的参数类型。
