registrations_controller.rb

class RegistrationsController < ApplicationController
  def create 
    user = User.create!(
      email: params["user"]["email"],
      password: params["user"]["password"],
      password_confirmation: params["user"]["password_confirmation"]
    )

    if user 
      session[:user_id] = user.id 
      render json: {
        status: :created,
        user: user
      }
    else
      render json: { status: 500 }
    end
  end
end