rails - Pass id parameter on a link_to

Question

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

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

Answer 1

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

otherwise:

#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  

Answer 2

A good approach to this kind of problems, its to see what are you sending with the params. This can be done with debug.

<%= debug params # or any variable%>

With that information you will see (and learn) what kind of params are you sending to a controller.