Rails: Open a login modal from a controller - ruby-on-rails

Question

I'm building an ecommerce app, and have a pretty standard user model and order model. For a user to place an order they must first be logged in. I'm using a Bootstrap modal for the standard login\signup forms.
I'm trying to find a way for when a signed out visitor clicks the Order Now button (links to /orders/new) to have the login\signup modal appear, and then after they log in they'll be redirected to /orders/new path.
Here's my current Orders#new method:
def new
#order = Order.new
if current_user
#order.user = current_user
#order.docs.build
else
redirect_to new_order_path
end
end
Here's my current Users#new and Users#create methods. I used this guide to setup the modals.
def new
#user = User.new
respond_modal_with #user
end
def create
#user = User.new(user_params)
respond_modal_with #user, location: root_path
respond_to do |format|
if #user.save
format.html {
login(params[:user][:email], params[:user][:password])
UserMailer.send_signup_email(#user).deliver_later
redirect_to root_path, notice: "You have successfully signed up"
}
format.json { render :show, status: :created, location: #user }
else
format.html { render :new, alert: "Registration failed" }
format.json { render json: #user.errors, status: :unprocessable_entity }
end
end
end
Sorry if I'm missing important info here. It's my first time posting and I'm a newbie. Thanks in advance for your help!
Edit:
Comments were recommending I use Devise for authorization, and I should have mentioned that I'm already using Sorcery for my authentication\authorization. So that part of the problem isn't an issue. The trouble I'm having is just how to trigger the modal from the Orders controller. Thanks!

Answer 1

Hi if you want to add functionality such as login/signup and perform all those operations, I would recommend you to use 'devise' gem. It is very easy and handy to use. You can find its documentation here. It has several methods like user_signed_in? which will help your problem signed out user to show login page and then continue your modal operation.
Thanks

Answer 2

To do this in a DRY way using Devise you can use the StoreLocation module. see the code: https://github.com/plataformatec/devise/blob/7d3d6fb3f04caea95e343956a88654f753b45af4/lib/devise/controllers/store_location.rb
To use that, you can follow the instructions from their WIKI: https://github.com/plataformatec/devise/wiki/How-To:-redirect-to-a-specific-page-on-successful-sign-in
Pretty much, you will have to:
1.Create a filter in your application_controller to redirect to sign-in page and save the current path:
def ensure_logged_in_or_redirect
unless logged_in?
store_location_for(:user, request.path)
redirect_to new_user_session_path
end
end
2.Create the after_sign_in_path_for method also in the application_controller, as shown on the Wiki.
3.Call that ensure_logged_in_or_redirect filter before the actions you want to protect, like the 'New Order' one.
Hope that helps.