How to convert from `form_tag` to `simple_form_for` way for Sign In?

Question

This snippet works fine:

<%= form_tag(session_path) do |f| %>
   <p>
       <%= label_tag :email %>
       <%= email_field_tag :email, nil %>
    </p>
    <p>
       <%= label_tag :password %>
       <%= password_field_tag :password, nil %>
    </p>
        <%= submit_tag "Sign in", class: 'btn-primary' %>
<% end %>

But when I tried to refactor it to simple_form_for as per screenshot, it's giving me error Invalid email or password!

# sessions_controller.rb
class SessionsController < ApplicationController
    def new
    end

    def create
        if user = User.authenticate(params[:email],params[:password])
            session[:user_id] = user.id
            flash[:notice] = "Signed in successfully."
            redirect_to user
        else
            flash.now[:alert] = 'Invalid email or password!'
            render :new
        end
    end
end

I'm feeling like there's something wrong in the line

<%= simple_form_for :session, url: session_path do |f| %>

In routes.rb: resource :session - Yes, it's singular, not plural

Answer 1

When you added simple_form_for :session the form started to send all parameters wrapped in the session key: session: { email: 'email@email.com', password: 'password' }. You'll see it if you check server log

Change in the controller:

User.authenticate(params[:session][:email], params[:session][:password])