Ruby on Rails：在link_to辅助路径中使用Variable

Question

I've got a HAML partial that receives a variable bar , and I'd like to inject that variable in the link_to path.

For example:

= link_to new_foo_path, class: 'source card' do
    .stuff

I want to replace foo with bar.

I've tried:

= link_to new_#{bar}_path, class: 'source card' do

and a dozen other things, but nothing seems to work.

Thoughts?

Answer 1

You can try it like this:

link_to send("new_#{bar}_path"), class: "source card" do

Basically, send makes something a method or variable, and it allows you to combine everything in that string into one variable.

Answer 2

I encountered a similar situation so I created a view helper. For your case I guess you can do something similar.

Create a view helper function inside helpers/application_helper.rb :

def custom_path pathvar
   if pathvar == 'foo'
      new_foo_path
   elsif pathvar == 'bar'
      new_bar_path
   end
end

Then in your view, you can use it like this:

= link_to custom_path(bar), class: 'source card' do

You can modify the example as per your needs. This looks more elegant to me.

Answer 3

您可以像这样向链接助手添加参数：

link_to "New Foo", new_foo_path(bar: "bar")

Answer 4

我想你可以使用eval ：

= link_to eval("new_#{bar}_path"), class: 'source card' do