Dynamic Paths in Helper

Question

I'm trying to create a helper method for my admin links. In quite a few views I have the code

<% if current_user %> <%= link_to "Edit", edit_model_path(model) %> <%= link_to "New", new_model_path %> <%= link_to "Delete", model, :confirm => "You're a Noob",  :method => :delete %> <% end %> 

that only display these when logged in.

I would like to do something like this in their place

<%= admin_links(model) %> 

and pass the current item into the application helper method

def admin_links(m)  if current_user   a = "#{link_to "edit" edit_m_path(m)}"   a << "#{link_to "new" new_m_path}"   a << "#{link_to "Delete", m, :confirm => "Your a Noob",  :method => :delete}"  end end 

Or something of the like.

Answer 1

basically you need to transform the class name of the model into something pointing to the correct path.

model_name = m.class.to_s.underscore 

And then use it to call the appropriate path methods

link_to "edit", send("edit_#{model_name}_path", m) 

As an aside, you don't need to put the link_tos in #{} because that function simply returns a string.

Answer 2

Rails provides polymorphic routes to handle this problem: http://api.rubyonrails.org/classes/ActionDispatch/Routing/PolymorphicRoutes.html

= link_to "Edit", polymorphic_path(model), :method => :put