credentials_controller.rb

credentials_controller.rb

class CredentialsController < ApplicationController
  def create
    create_options = WebAuthn::Credential.options_for_create(
      user: {
        id: current_user.webauthn_id,
        name: current_user.username,
      },
      exclude: current_user.credentials.pluck(:external_id)
    )

    session[:current_registration] = { challenge: create_options.challenge }

    respond_to do |format|
      format.json { render json: create_options }
    end
  end
end