How can I globally override a rails url helper?

Question

I needed to add a simple change to foo_path, so I did this:

module ApplicationHelper
  # [...]

  def foo_path(foo, options = {})
    option         


        

Answer 1

In Rails 3 and 4, route url helpers all resides in this module Rails.application.routes.url_helpers. So we can include a module to override methods inside it.

module FooUrlHelper
  def foo_path(foo, options = {})
    options.merge!(bar: foo.some_attribute)
    super
  end
end

# Works at Rails 4.2.1
Rails.application.routes.url_helpers.send(:include, FooUrlHelper)

# For Rails 4.2.6, I thought the following worked, but there seems to be issues, don't have time to figure out a solution yet
Rails.application.routes.named_routes.url_helpers_module.send(:include, FooUrlHelper)

You can just place this inside initializers

I tried this in console and controller and seems to work fine.