users_controller.rb

class UsersController < ApplicationController
  
  def show
    context = ::Users::Contexts::Fetch.call(params: query_users_params, type: :single)
    return error_response(context.message) unless context.success?

    render json: UserBlueprint.render(context.payload), status: :ok
  end

  private

  def query_users_params
    @query_users_params ||= Users::QueryInput.new(fields: params.permit!.to_h)
  end
end