Rails: call link_to in a controller

Question

I want to put a link_to call with an argument into a controller like so (twitter is an argument in the authorise route):

def method
  "/authorise/twitter"
  ...
end

I don't mind copying the authorise method to make it happen, but I don't know how to pass the twitter argument to that method.

def authorise
  user = User.from_omniauth(current_user, env['omniauth.auth'])
  session[:user_id] = current_user.id
end

Any help would be great. Thanks!

UPDATE

Here's the route I'm trying to replicate in a way in the controller method:

get '/authorise/:provider/callback', to: 'sessions#authorise'

And here's the from_omniauth method:

def self.from_omniauth(user, auth)
  user.provider = auth.provider
  if auth.provider == "facebook"
    user.uid = auth.uid
    user.oauth_token = auth.credentials.token
    user.oauth_expires_at = Time.at(auth.credentials.expires_at)
  elsif auth.provider == "twitter"
    user.access_token = auth["credentials"]["token"]
    user.access_token_secret = auth["credentials"]["secret"]
  end
  user.save!
end

It should be passing 'twitter' to the auth argument, but I get this error:

undefined method `provider' for "twitter":String
app/models/user.rb:82:in `from_omniauth'

It feels like I should be passing a hash or similar, but I can't figure out what that should be. It now feels like an oauth-specific thing.

Answer 1

While you can't pass arguments to a rails actions, you can, indeed pass them to methods in a controller.

Stepping back from your question, I believe you're asking how to reuse a controller method. Generally, you'd want to avoid copying a method - keeping it DRY. I would break out your authorize action into a separate method.

Your code could look like this:

def new_method
  authorize_from_strategy('twitter')
end

def authozie #old method
  authorize_from_strategy
end

private 

def authorize_from_strategy(strategy=nil)
  user = User.from_omniauth(current_user, strategy || env['omniauth.auth'])
  session[:user_id] = current_user.id
end 

If you wanted to use the authorize_from_strategy method in any controller, you could move that private action to your application_controller.

Also, setting session[:user_id] might be redundant if you're using something like devise. Devise stores your user's info in the session already, which is how you have access to current_user.

Answer 2

You can't pass arguments for a controller action, but you can pass request params into the controller. So something like:

def method
  @twitter = Your_Model.find params[:twitter]
end

Hope this helps.