Ruby on Rails从View上的URL获取参数

Question

I'd like to get the paramenter from the URL on my view/html.

For example, I'm showing an specific item from my data base, and the URL is like this: " http://localhost:3000/menus/index.%23%3CMenu::ActiveRecord_Relation:0x007f50ed153250%3E?id=6 "

What I want is: when I click on the New Button of that specific item, the form opens with the URL " http://localhost:3000/menus/new ", but I want somehow pass that id=6 to this NEW view.

I am using this code on the html to open the form: <%= link_to 'Novo', new_menu_path %>

I also tried: <%= link_to 'Novo', new_menu_path(@menus, :id) %> , but the id param is always null/empty.

How do I do that? Thank you

Answer 1

To pass an extra param to an url when you define a link_to

<%= link_to 'Novo', new_menu_path(id: @menu.id, other_param: "hello") %>

will generate http://localhost:3000/menus/new?id=6&other_param=hello

this will add the following to the params hash

Parameters: {"id"=>"6", "other_param"=>"hello"}

Answer 2

well :id is just a symbol, you need to tell the route helper what to bind to it. For example

<%= link_to 'Novo', new_menu_path(id: params[:id]) %>

which should give you something like /menus/new?id=6