Question

On my user model, I have a bunch of attributes like is_foos_admin and is_bars_admin that determine which kinds of records a user is allowed to edit.

I’d like to DRY out my edit links, which currently look like this:

<%= link_to 'Edit', edit_foo_path(foo), :class => 'edit' if current_user.is_foos_admin? %>
...
<%= link_to 'Edit', edit_bar_path(bar), :class => 'edit' if current_user.is_bars_admin? %>

I want to make a helper that lets me pass in a foo or bar and get back a link to edit it, like so:

<%= edit_link_for(foo) %>

The helper might look like this (which doesn’t work):

def edit_link_for(thing)
  if current_user.is_things_admin?
    link_to 'Edit', edit_polymorphic_path(thing), :class => 'edit'
  end
end

The model-agnostic edit_polymorphic_path method gets me halfway there, but it’s the “is_things_admin” method that I don’t know how to universalize. If I could use interpolated Ruby inside of a helper, I’d want to do something like

if current_user.is_#{thing.class.name.downcase.pluralize}_admin?

But of course that doesn’t work. Any ideas?

Answer 1

Try using send:

if current_user.send("is_#{@model}_admin?")