def create
    if params[:provider].present?
      @user = User.find_or_create_from_auth(request.env['omniauth.auth'])
      if @user
        session[:user_id] = @user.id
        flash[:notice] = "Logged in as #{@user.name}"
        redirect_to dashboard_path
      end

def self.find_or_create_from_auth(auth)
    find_or_create_by!(provider: auth.provider, uid: auth.uid, password_digest: 'N/A') do |user|
      user.provider = auth.provider
      user.uid = auth.uid
      user.name = auth.info.name
      user.email = auth.info.email
      user.address = "123 ABC St"
      user.password = 'n/a'
      user.oauth_token = auth.credentials.token
      user.oauth_expires_at = Time.at(auth.credentials.expires_at)
      user.save
    end
  end