Devise ignore my custom strategy - ruby-on-rails

Question

I want to create a custom auth strategy for accessing the API. I followed the example code at Devise ignoring custom strategy.
The problem is that the valid? method in my Api strategy is never run (based on trying to pry in it).
My code:
module Devise
module Strategies
class Api < Devise::Strategies::Base
def valid?
binding.pry
params[:request_source] == 'api'
end
def authenticate!
#do stuff here
if user
success!(user)
else
warden.custom_failure!
render :json=> {:success=>false, :message=>"Error with your login or password"}, :status=>401
end
end
end
Warden::Strategies.add(:api, Devise::Strategies::Api)
end
end
and in the devise initializer:
config.warden do |manager|
manager.default_strategies.unshift :api
end
What ever I do, it seems like Devise always use its default strategy. AFAIK, this should be enough...
-------EDIT--------
I require the strategy like this at the very top of my devise initializer:
require Rails.root.join('app/devise/strategies/api')
I know the strategy is loaded at boot time since if I put a pry call inside the class, it will start a pry session. But the Pry calls inside the methods are never run. :-S

Answer 1

Found the answer!
I had to use this:
config.warden do |manager|
manager.default_strategies(scope: :user).unshift :api
end
to make it work. Weird thing is, a lot of the sample code I saw on the net did not use it :-S

Answer 2

When are you requiring your custom strategy? Comparing to the example, you are adding the strategy there instead of in your initializer. You might try requiring the custom strategy at the top of your initializer to make sure it's loaded before you add it to default_strategies.
If that doesn't do the trick, don't be afraid to add some temporary puts statements right in devise itself where authenticate is called to check default_strategies. That is, if you're not already confortable using the debugger, which is what I would do.