rails - 在 link_to 上传递 id 参数 [英] rails - Pass id parameter on a link_to

问题描述

我正在尝试将当前页面 (id) 的参数传递到下一页，以便我可以创建依赖模型条目.

I'm trying to pass the parameter of the current page(id) to the next page so I can create a dependent model entry.

即项目有标，标属于项目.

i.e. Projects have bids, bids belong to projects.

所以在项目的展示页面上，我添加了链接

So on the show page for a project I added the link

<%= link_to "New Bid", new_bid_path(@project) %>

创建并执行 url.... "http://localhost:3000/bids/new.2"

Which creates and performs the url.... "http://localhost:3000/bids/new.2"

我有

def new
    @bid = Bid.new
    @project =  Project.find(params[:id])
end

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"

in the bids controller but I keep getting the error "Couldn't find Project without an ID"

???

怎么回事，我怎么传不了id?

Whats going on, how come I can't pass the id?

推荐答案

如果你的bids不是项目的嵌套资源，那么你可以在路径中添加project_id作为参数:

If your bids are not nested resource of the project, then you can add project_id as parameter to the path:

<%= link_to "New Bid", new_bid_path(:project => @project.id) %>

def new  
  @bid = Bid.new  
  @project =  Project.find(params[:project])  
end

否则:

#routes.rb

map.resources :projects do |project|  
  project.resources :bids
end

<%= link_to "New Bid", new_project_bid_path(@project) %>

def new  
  @project =  Project.find(params[:project_id])    
  @bid = @project.bids.build  
end  

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