Getting separate queries for each attribute of an entity

I am wondering why I am getting a separate query for each attribute of my entity.

For example, here I am asking for a CustomerEntity and it has more than 40 exposed attributes, and it seems that grape entity ask for each attribute with a separate query:

My entity is:

class CustomerEntity < Grape::Entity
    expose :is_wholesale
    expose :catch_all
    expose :max_managers
    expose :max_customizations
    expose :max_mailing_lists
    expose :max_email_quota
    expose :max_email_accounts_archive
    expose :max_email_accounts
    expose :max_domains
    expose :expiration
    expose :billing
    expose :is_reseller
    expose :status_detail
    expose :status
    expose :code
    expose :company
    expose :lastname
    expose :firstname
    # authentication
    expose :fakefield2
    expose :fakefield
    expose :fakefield3
    expose :fakefield4
    expose :fakefield5
    expose :email_address
    expose :language
    expose :type
end

and I am calling in my endpoint with:

class Users::Authentication < Grape::API
    represent Customer, with: CustomerEntity

   get do
      present(u)
   end

Am I doing something wrong?

Start with the CustomerEntity exposure list and the Users::Authentication endpoint, especially the present(u) call, and reproduce the response while watching the query log. Trace how each exposed attribute is resolved and compare the observed queries with the entity representation; done means identifying the cause and establishing the expected query behavior.