Cakephp is adding quotes to my query. How to fix this?

Cakephp is adding quotes to my query. How to fix this?

Cakephp is adding quotes to my field where i do some postgress functions.
I use $this->paginate where the fields array looks like this:
'fields' => array( 'DealRegistration.id',
'DealRegistration.company_name',
'RequestSpecialPrice.total_price',
'RequestSpecialPrice.request_price',
'RequestSpecialPrice.created',
'RequestSpecialPrice.partner_status',
'RequestSpecialPrice.status',
'RequestSpecialPrice.discount',
"**concat('SP',lpad(CAST(RequestSpecialPrice.deal_registration_id as
TEXT),8,'0'))**",
)
The query generated by cake looks like this: SELECT
concat('SP',lpad(CAST("RequestSpecialPrice"."deal_registration_id" AS
"TEXT"),8,'0')) FROM table
If i remove the quotes from "TEXT" then the query works: SELECT
concat('SP',lpad(CAST("RequestSpecialPrice"."deal_registration_id" as
TEXT),8,'0'))) FROM table
How can i force cakephp not to add those quotes?