Dependency injection about actor HOT 2 CLOSED

@fidalgo I have simplified this a bit, so that in v3.3.0 you can now use input :client, default: ServiceClient 🎉

from actor.

Hi there! I haven’t used actors for dependency injection, so I hadn’t encountered this use-case before. It looks very versatile though, I can think of a few places where this would be very handy in my code!

The issue here is that in order to handle dynamic defaults, the default: keyword tries to trigger .call on whatever is given to it (if it responds to that method). This works well for lambdas, but not so much for actors themselves.

Therefore, one way to fix this is to define the default inside a lambda, as so:

input :client, default: -> { ServiceClient }

The full solution for your use-case would be:

class ServiceClient < Actor
  input :token, allow_nil: false
  input :term, allow_nil: false

  output :outcome

  def call
    self.outcome = Faraday.new('http://example.com/service').get("", query: term)
  end
end

class Persistor < Actor
  input :client, default: -> { ServiceClient }
  
  def call
    outcome = client.result(token: 'token', term: 'actor').outcome
    puts outcome.status if outcome.success?
  end
end

from actor.